clk: stm32mp1: add clock tree initialization

add binding and code for clock tree initialization from device tree

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

3 files changed, 1086 insertions, 0 deletions

diff --git a/doc/device-tree-bindings/clock/st,stm32mp1.txt b/doc/device-tree-bindings/clock/st,stm32mp1.txt
new file mode 100644
index 0000000..c29d90f
--- /dev/null
+++ b/doc/device-tree-bindings/clock/st,stm32mp1.txt
@@ -0,0 +1,226 @@
+STMicroelectronics STM32MP1 clock tree initialization
+=====================================================
+
+The STM32MP clock tree initialization is based on device tree information
+for RCC IP and on fixed clocks.
+
+-------------------------------
+RCC CLOCK = st,stm32mp1-rcc-clk
+-------------------------------
+
+The RCC IP is both a reset and a clock controller but this documentation only
+describes the fields added for clock tree initialization which are not present
+in Linux binding.
+
+Please refer to ../mfd/st,stm32-rcc.txt for all the other properties common
+with Linux.
+
+Required properties:
+
+- compatible: Should be "st,stm32mp1-rcc-clk"
+
+- st,clksrc : The clock source in this order
+
+	for STM32MP15x: 9 clock sources are requested
+		MPU AXI MCU PLL12 PLL3 PLL4 RTC MCO1 MCO2
+
+	with value equals to RCC clock specifier as defined in
+	dt-bindings/clock/stm32mp1-clksrc.h: CLK_<NAME>_<SOURCE>
+
+- st,clkdiv : The div parameters in this order
+	for STM32MP15x: 11 dividers value are requested
+		MPU AXI MCU APB1 APB2 APB3 APB4 APB5 RTC MCO1 MCO2
+
+	with DIV coding defined in RCC associated register RCC_xxxDIVR
+
+	most the case, it is:
+		0x0: not divided
+		0x1: division by 2
+		0x2: division by 4
+		0x3: division by 8
+		...
+
+	but for RTC MCO1 MCO2, the coding is different:
+		0x0: not divided
+		0x1: division by 2
+		0x2: division by 3
+		0x3: division by 4
+		...
+
+Optional Properties:
+- st,pll
+    PLL children node for PLL1 to PLL4 : (see ref manual for details)
+    with associated index 0 to 3 (st,pll@0 to st,pll@4)
+    PLLx is off when the associated node is absent
+
+    - Sub-nodes:
+
+	- cfg:	The parameters for PLL configuration in this order:
+		DIVM DIVN DIVP DIVQ DIVR Output
+
+		with DIV value as defined in RCC spec:
+			0x0: bypass (division by 1)
+			0x1: division by 2
+			0x2: division by 3
+			0x3: division by 4
+			...
+
+		and Output = bitfield for each output value = 1:ON/0:OFF
+			BIT(0) => output P : DIVPEN
+			BIT(1) => output Q : DIVQEN
+			BIT(2) => output R : DIVREN
+		  NB : macro PQR(p,q,r) can be used to build this value
+		       with p,p,r = 0 or 1
+
+	- frac : Fractional part of the multiplication factor
+		(optional, PLL is in integer mode when absent)
+
+	- csg : Clock Spreading Generator (optional)
+	        with parameters in this order:
+		MOD_PER INC_STEP SSCG_MODE
+
+		* MOD_PER: Modulation Period Adjustment
+		* INC_STEP: Modulation Depth Adjustment
+		* SSCG_MODE: Spread spectrum clock generator mode
+		  you can use associated defines from stm32mp1-clksrc.h
+		  * SSCG_MODE_CENTER_SPREAD = 0
+		  * SSCG_MODE_DOWN_SPREAD = 1
+
+
+- st,pkcs : used to configure the peripherals kernel clock selection
+  containing a list of peripheral kernel clock source identifier as defined
+  in the file dt-bindings/clock/stm32mp1-clksrc.h
+
+  Example:
+
+	rcc: rcc@50000000 {
+		compatible = "syscon", "simple-mfd";
+
+		reg = <0x50000000 0x1000>;
+
+		rcc_clk: rcc-clk@50000000 {
+			#clock-cells = <1>;
+			compatible = "st,stm32mp1-rcc-clk";
+
+			st,clksrc = <	CLK_MPU_PLL1P
+					CLK_AXI_PLL2P
+					CLK_MCU_HSI
+					CLK_PLL12_HSE
+					CLK_PLL3_HSE
+					CLK_PLL4_HSE
+					CLK_RTC_HSE
+					CLK_MCO1_DISABLED
+					CLK_MCO2_DISABLED
+			>;
+
+			st,clkdiv = <
+				1 /*MPU*/
+				0 /*AXI*/
+				0 /*MCU*/
+				1 /*APB1*/
+				1 /*APB2*/
+				1 /*APB3*/
+				1 /*APB4*/
+				5 /*APB5*/
+				23 /*RTC*/
+				0 /*MCO1*/
+				0 /*MCO2*/
+			>;
+
+			st,pll@0 {
+				cfg = < 1 53 0 0 0 1 >;
+				frac = < 0x810 >;
+			};
+			st,pll@1 {
+				cfg = < 1 43 1 0 0 PQR(0,1,1)>;
+				csg = <10 20 1>;
+			};
+			st,pll@2 {
+				cfg = < 2 85 3 13 3 0>;
+				csg = <10 20 SSCG_MODE_CENTER_SPREAD>;
+			};
+			st,pll@3 {
+				cfg = < 2 78 4 7 9 3>;
+			};
+			st,pkcs = <
+					CLK_STGEN_HSE
+					CLK_CKPER_HSI
+					CLK_USBPHY_PLL2P
+					CLK_DSI_PLL2Q
+				  >;
+		};
+	};
+
+--------------------------
+other clocks = fixed-clock
+--------------------------
+The clock tree is also based on 5 fixed-clock in clocks node
+used to define the state of associated ST32MP1 oscillators:
+- clk-lsi
+- clk-lse
+- clk-hsi
+- clk-hse
+- clk-csi
+
+At boot the clock tree initialization will
+- enable the oscillator present in device tree
+- disable HSI oscillator if the node is absent (always activated by bootrom)
+
+Optional properties :
+
+a) for external oscillator: "clk-lse", "clk-hse"
+
+	3 optional fields are managed
+	- "st,bypass" Configure the oscillator bypass mode (HSEBYP, LSEBYP)
+	- "st,css" Activate the clock security system (HSECSSON, LSECSSON)
+	- "st,drive" (only for LSE) value of the drive for the oscillator
+	   (see LSEDRV_ define in the file dt-bindings/clock/stm32mp1-clksrc.h)
+
+	Example board file:
+
+	/ {
+		clocks {
+			clk_hse: clk-hse {
+				#clock-cells = <0>;
+				compatible = "fixed-clock";
+				clock-frequency = <64000000>;
+				st,bypass;
+			};
+
+			clk_lse: clk-lse {
+				#clock-cells = <0>;
+				compatible = "fixed-clock";
+				clock-frequency = <32768>;
+				st,css;
+				st,drive = <LSEDRV_LOWEST>;
+			};
+	};
+
+b) for internal oscillator: "clk-hsi"
+
+	internally HSI clock is fixed to 64MHz for STM32MP157 soc
+	in device tree clk-hsi is the clock after HSIDIV (ck_hsi in RCC doc)
+	So this clock frequency is used to compute the expected HSI_DIV
+	for the clock tree initialisation
+
+	ex: for HSIDIV = /1
+
+	/ {
+		clocks {
+			clk_hsi: clk-hsi {
+				#clock-cells = <0>;
+				compatible = "fixed-clock";
+				clock-frequency = <64000000>;
+			};
+	};
+
+	ex: for HSIDIV = /2
+
+	/ {
+		clocks {
+			clk_hsi: clk-hsi {
+				#clock-cells = <0>;
+				compatible = "fixed-clock";
+				clock-frequency = <32000000>;
+			};
+	};
diff --git a/drivers/clk/clk_stm32mp1.c b/drivers/clk/clk_stm32mp1.c
index 0ea2035..55b0f79 100644
--- a/drivers/clk/clk_stm32mp1.c
+++ b/drivers/clk/clk_stm32mp1.c
@@ -12,10 +12,21 @@
 #include <spl.h>
 #include <syscon.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <dt-bindings/clock/stm32mp1-clks.h>
+#include <dt-bindings/clock/stm32mp1-clksrc.h>
+
+#if !defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD)
+/* activate clock tree initialization in the driver */
+#define STM32MP1_CLOCK_TREE_INIT
+#endif
 
 #define MAX_HSI_HZ		64000000
 
+/* TIMEOUT */
+#define TIMEOUT_200MS		200000
+#define TIMEOUT_1S		1000000
+
 /* RCC registers */
 #define RCC_OCENSETR		0x0C
 #define RCC_OCENCLRR		0x10
@@ -1079,6 +1090,565 @@ static ulong stm32mp1_clk_get_rate(struct clk *clk)
 	return rate;
 }
 
+#ifdef STM32MP1_CLOCK_TREE_INIT
+static void stm32mp1_ls_osc_set(int enable, fdt_addr_t rcc, u32 offset,
+				u32 mask_on)
+{
+	u32 address = rcc + offset;
+
+	if (enable)
+		setbits_le32(address, mask_on);
+	else
+		clrbits_le32(address, mask_on);
+}
+
+static void stm32mp1_hs_ocs_set(int enable, fdt_addr_t rcc, u32 mask_on)
+{
+	if (enable)
+		setbits_le32(rcc + RCC_OCENSETR, mask_on);
+	else
+		setbits_le32(rcc + RCC_OCENCLRR, mask_on);
+}
+
+static int stm32mp1_osc_wait(int enable, fdt_addr_t rcc, u32 offset,
+			     u32 mask_rdy)
+{
+	u32 mask_test = 0;
+	u32 address = rcc + offset;
+	u32 val;
+	int ret;
+
+	if (enable)
+		mask_test = mask_rdy;
+
+	ret = readl_poll_timeout(address, val,
+				 (val & mask_rdy) == mask_test,
+				 TIMEOUT_1S);
+
+	if (ret)
+		pr_err("OSC %x @ %x timeout for enable=%d : 0x%x\n",
+		       mask_rdy, address, enable, readl(address));
+
+	return ret;
+}
+
+static void stm32mp1_lse_enable(fdt_addr_t rcc, int bypass, int lsedrv)
+{
+	u32 value;
+
+	if (bypass)
+		setbits_le32(rcc + RCC_BDCR, RCC_BDCR_LSEBYP);
+
+	/*
+	 * warning: not recommended to switch directly from "high drive"
+	 * to "medium low drive", and vice-versa.
+	 */
+	value = (readl(rcc + RCC_BDCR) & RCC_BDCR_LSEDRV_MASK)
+		>> RCC_BDCR_LSEDRV_SHIFT;
+
+	while (value != lsedrv) {
+		if (value > lsedrv)
+			value--;
+		else
+			value++;
+
+		clrsetbits_le32(rcc + RCC_BDCR,
+				RCC_BDCR_LSEDRV_MASK,
+				value << RCC_BDCR_LSEDRV_SHIFT);
+	}
+
+	stm32mp1_ls_osc_set(1, rcc, RCC_BDCR, RCC_BDCR_LSEON);
+}
+
+static void stm32mp1_lse_wait(fdt_addr_t rcc)
+{
+	stm32mp1_osc_wait(1, rcc, RCC_BDCR, RCC_BDCR_LSERDY);
+}
+
+static void stm32mp1_lsi_set(fdt_addr_t rcc, int enable)
+{
+	stm32mp1_ls_osc_set(enable, rcc, RCC_RDLSICR, RCC_RDLSICR_LSION);
+	stm32mp1_osc_wait(enable, rcc, RCC_RDLSICR, RCC_RDLSICR_LSIRDY);
+}
+
+static void stm32mp1_hse_enable(fdt_addr_t rcc, int bypass, int css)
+{
+	if (bypass)
+		setbits_le32(rcc + RCC_OCENSETR, RCC_OCENR_HSEBYP);
+
+	stm32mp1_hs_ocs_set(1, rcc, RCC_OCENR_HSEON);
+	stm32mp1_osc_wait(1, rcc, RCC_OCRDYR, RCC_OCRDYR_HSERDY);
+
+	if (css)
+		setbits_le32(rcc + RCC_OCENSETR, RCC_OCENR_HSECSSON);
+}
+
+static void stm32mp1_csi_set(fdt_addr_t rcc, int enable)
+{
+	stm32mp1_ls_osc_set(enable, rcc, RCC_OCENSETR, RCC_OCENR_CSION);
+	stm32mp1_osc_wait(enable, rcc, RCC_OCRDYR, RCC_OCRDYR_CSIRDY);
+}
+
+static void stm32mp1_hsi_set(fdt_addr_t rcc, int enable)
+{
+	stm32mp1_hs_ocs_set(enable, rcc, RCC_OCENR_HSION);
+	stm32mp1_osc_wait(enable, rcc, RCC_OCRDYR, RCC_OCRDYR_HSIRDY);
+}
+
+static int stm32mp1_set_hsidiv(fdt_addr_t rcc, u8 hsidiv)
+{
+	u32 address = rcc + RCC_OCRDYR;
+	u32 val;
+	int ret;
+
+	clrsetbits_le32(rcc + RCC_HSICFGR,
+			RCC_HSICFGR_HSIDIV_MASK,
+			RCC_HSICFGR_HSIDIV_MASK & hsidiv);
+
+	ret = readl_poll_timeout(address, val,
+				 val & RCC_OCRDYR_HSIDIVRDY,
+				 TIMEOUT_200MS);
+	if (ret)
+		pr_err("HSIDIV failed @ 0x%x: 0x%x\n",
+		       address, readl(address));
+
+	return ret;
+}
+
+static int stm32mp1_hsidiv(fdt_addr_t rcc, ulong hsifreq)
+{
+	u8 hsidiv;
+	u32 hsidivfreq = MAX_HSI_HZ;
+
+	for (hsidiv = 0; hsidiv < 4; hsidiv++,
+	     hsidivfreq = hsidivfreq / 2)
+		if (hsidivfreq == hsifreq)
+			break;
+
+	if (hsidiv == 4) {
+		pr_err("clk-hsi frequency invalid");
+		return -1;
+	}
+
+	if (hsidiv > 0)
+		return stm32mp1_set_hsidiv(rcc, hsidiv);
+
+	return 0;
+}
+
+static void pll_start(struct stm32mp1_clk_priv *priv, int pll_id)
+{
+	const struct stm32mp1_clk_pll *pll = priv->data->pll;
+
+	writel(RCC_PLLNCR_PLLON, priv->base + pll[pll_id].pllxcr);
+}
+
+static int pll_output(struct stm32mp1_clk_priv *priv, int pll_id, int output)
+{
+	const struct stm32mp1_clk_pll *pll = priv->data->pll;
+	u32 pllxcr = priv->base + pll[pll_id].pllxcr;
+	u32 val;
+	int ret;
+
+	ret = readl_poll_timeout(pllxcr, val, val & RCC_PLLNCR_PLLRDY,
+				 TIMEOUT_200MS);
+
+	if (ret) {
+		pr_err("PLL%d start failed @ 0x%x: 0x%x\n",
+		       pll_id, pllxcr, readl(pllxcr));
+		return ret;
+	}
+
+	/* start the requested output */
+	setbits_le32(pllxcr, output << RCC_PLLNCR_DIVEN_SHIFT);
+
+	return 0;
+}
+
+static int pll_stop(struct stm32mp1_clk_priv *priv, int pll_id)
+{
+	const struct stm32mp1_clk_pll *pll = priv->data->pll;
+	u32 pllxcr = priv->base + pll[pll_id].pllxcr;
+	u32 val;
+
+	/* stop all output */
+	clrbits_le32(pllxcr,
+		     RCC_PLLNCR_DIVPEN | RCC_PLLNCR_DIVQEN | RCC_PLLNCR_DIVREN);
+
+	/* stop PLL */
+	clrbits_le32(pllxcr, RCC_PLLNCR_PLLON);
+
+	/* wait PLL stopped */
+	return readl_poll_timeout(pllxcr, val, (val & RCC_PLLNCR_PLLRDY) == 0,
+				  TIMEOUT_200MS);
+}
+
+static void pll_config_output(struct stm32mp1_clk_priv *priv,
+			      int pll_id, u32 *pllcfg)
+{
+	const struct stm32mp1_clk_pll *pll = priv->data->pll;
+	fdt_addr_t rcc = priv->base;
+	u32 value;
+
+	value = (pllcfg[PLLCFG_P] << RCC_PLLNCFGR2_DIVP_SHIFT)
+		& RCC_PLLNCFGR2_DIVP_MASK;
+	value |= (pllcfg[PLLCFG_Q] << RCC_PLLNCFGR2_DIVQ_SHIFT)
+		 & RCC_PLLNCFGR2_DIVQ_MASK;
+	value |= (pllcfg[PLLCFG_R] << RCC_PLLNCFGR2_DIVR_SHIFT)
+		 & RCC_PLLNCFGR2_DIVR_MASK;
+	writel(value, rcc + pll[pll_id].pllxcfgr2);
+}
+
+static int pll_config(struct stm32mp1_clk_priv *priv, int pll_id,
+		      u32 *pllcfg, u32 fracv)
+{
+	const struct stm32mp1_clk_pll *pll = priv->data->pll;
+	fdt_addr_t rcc = priv->base;
+	enum stm32mp1_plltype type = pll[pll_id].plltype;
+	int src;
+	ulong refclk;
+	u8 ifrge = 0;
+	u32 value;
+
+	src = readl(priv->base + pll[pll_id].rckxselr) & RCC_SELR_SRC_MASK;
+
+	refclk = stm32mp1_clk_get_fixed(priv, pll[pll_id].refclk[src]) /
+		 (pllcfg[PLLCFG_M] + 1);
+
+	if (refclk < (stm32mp1_pll[type].refclk_min * 1000000) ||
+	    refclk > (stm32mp1_pll[type].refclk_max * 1000000)) {
+		debug("invalid refclk = %x\n", (u32)refclk);
+		return -EINVAL;
+	}
+	if (type == PLL_800 && refclk >= 8000000)
+		ifrge = 1;
+
+	value = (pllcfg[PLLCFG_N] << RCC_PLLNCFGR1_DIVN_SHIFT)
+		 & RCC_PLLNCFGR1_DIVN_MASK;
+	value |= (pllcfg[PLLCFG_M] << RCC_PLLNCFGR1_DIVM_SHIFT)
+		 & RCC_PLLNCFGR1_DIVM_MASK;
+	value |= (ifrge << RCC_PLLNCFGR1_IFRGE_SHIFT)
+		 & RCC_PLLNCFGR1_IFRGE_MASK;
+	writel(value, rcc + pll[pll_id].pllxcfgr1);
+
+	/* fractional configuration: load sigma-delta modulator (SDM) */
+
+	/* Write into FRACV the new fractional value , and FRACLE to 0 */
+	writel(fracv << RCC_PLLNFRACR_FRACV_SHIFT,
+	       rcc + pll[pll_id].pllxfracr);
+
+	/* Write FRACLE to 1 : FRACV value is loaded into the SDM */
+	setbits_le32(rcc + pll[pll_id].pllxfracr,
+		     RCC_PLLNFRACR_FRACLE);
+
+	pll_config_output(priv, pll_id, pllcfg);
+
+	return 0;
+}
+
+static void pll_csg(struct stm32mp1_clk_priv *priv, int pll_id, u32 *csg)
+{
+	const struct stm32mp1_clk_pll *pll = priv->data->pll;
+	u32 pllxcsg;
+
+	pllxcsg = ((csg[PLLCSG_MOD_PER] << RCC_PLLNCSGR_MOD_PER_SHIFT) &
+		    RCC_PLLNCSGR_MOD_PER_MASK) |
+		  ((csg[PLLCSG_INC_STEP] << RCC_PLLNCSGR_INC_STEP_SHIFT) &
+		    RCC_PLLNCSGR_INC_STEP_MASK) |
+		  ((csg[PLLCSG_SSCG_MODE] << RCC_PLLNCSGR_SSCG_MODE_SHIFT) &
+		    RCC_PLLNCSGR_SSCG_MODE_MASK);
+
+	writel(pllxcsg, priv->base + pll[pll_id].pllxcsgr);
+}
+
+static int set_clksrc(struct stm32mp1_clk_priv *priv, unsigned int clksrc)
+{
+	u32 address = priv->base + (clksrc >> 4);
+	u32 val;
+	int ret;
+
+	clrsetbits_le32(address, RCC_SELR_SRC_MASK, clksrc & RCC_SELR_SRC_MASK);
+	ret = readl_poll_timeout(address, val, val & RCC_SELR_SRCRDY,
+				 TIMEOUT_200MS);
+	if (ret)
+		pr_err("CLKSRC %x start failed @ 0x%x: 0x%x\n",
+		       clksrc, address, readl(address));
+
+	return ret;
+}
+
+static int set_clkdiv(unsigned int clkdiv, u32 address)
+{
+	u32 val;
+	int ret;
+
+	clrsetbits_le32(address, RCC_DIVR_DIV_MASK, clkdiv & RCC_DIVR_DIV_MASK);
+	ret = readl_poll_timeout(address, val, val & RCC_DIVR_DIVRDY,
+				 TIMEOUT_200MS);
+	if (ret)
+		pr_err("CLKDIV %x start failed @ 0x%x: 0x%x\n",
+		       clkdiv, address, readl(address));
+
+	return ret;
+}
+
+static void stm32mp1_mco_csg(struct stm32mp1_clk_priv *priv,
+			     u32 clksrc, u32 clkdiv)
+{
+	u32 address = priv->base + (clksrc >> 4);
+
+	/*
+	 * binding clksrc : bit15-4 offset
+	 *                  bit3:   disable
+	 *                  bit2-0: MCOSEL[2:0]
+	 */
+	if (clksrc & 0x8) {
+		clrbits_le32(address, RCC_MCOCFG_MCOON);
+	} else {
+		clrsetbits_le32(address,
+				RCC_MCOCFG_MCOSRC_MASK,
+				clksrc & RCC_MCOCFG_MCOSRC_MASK);
+		clrsetbits_le32(address,
+				RCC_MCOCFG_MCODIV_MASK,
+				clkdiv << RCC_MCOCFG_MCODIV_SHIFT);
+		setbits_le32(address, RCC_MCOCFG_MCOON);
+	}
+}
+
+static void set_rtcsrc(struct stm32mp1_clk_priv *priv,
+		       unsigned int clksrc,
+		       int lse_css)
+{
+	u32 address = priv->base + RCC_BDCR;
+
+	if (readl(address) & RCC_BDCR_RTCCKEN)
+		goto skip_rtc;
+
+	if (clksrc == CLK_RTC_DISABLED)
+		goto skip_rtc;
+
+	clrsetbits_le32(address,
+			RCC_BDCR_RTCSRC_MASK,
+			clksrc << RCC_BDCR_RTCSRC_SHIFT);
+
+	setbits_le32(address, RCC_BDCR_RTCCKEN);
+
+skip_rtc:
+	if (lse_css)
+		setbits_le32(address, RCC_BDCR_LSECSSON);
+}
+
+static void pkcs_config(struct stm32mp1_clk_priv *priv, u32 pkcs)
+{
+	u32 address = priv->base + ((pkcs >> 4) & 0xFFF);
+	u32 value = pkcs & 0xF;
+	u32 mask = 0xF;
+
+	if (pkcs & BIT(31)) {
+		mask <<= 4;
+		value <<= 4;
+	}
+	clrsetbits_le32(address, mask, value);
+}
+
+static int stm32mp1_clktree(struct udevice *dev)
+{
+	struct stm32mp1_clk_priv *priv = dev_get_priv(dev);
+	fdt_addr_t rcc = priv->base;
+	unsigned int clksrc[CLKSRC_NB];
+	unsigned int clkdiv[CLKDIV_NB];
+	unsigned int pllcfg[_PLL_NB][PLLCFG_NB];
+	ofnode plloff[_PLL_NB];
+	int ret;
+	int i, len;
+	int lse_css = 0;
+	const u32 *pkcs_cell;
+
+	/* check mandatory field */
+	ret = dev_read_u32_array(dev, "st,clksrc", clksrc, CLKSRC_NB);
+	if (ret < 0) {
+		debug("field st,clksrc invalid: error %d\n", ret);
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	ret = dev_read_u32_array(dev, "st,clkdiv", clkdiv, CLKDIV_NB);
+	if (ret < 0) {
+		debug("field st,clkdiv invalid: error %d\n", ret);
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	/* check mandatory field in each pll */
+	for (i = 0; i < _PLL_NB; i++) {
+		char name[12];
+
+		sprintf(name, "st,pll@%d", i);
+		plloff[i] = dev_read_subnode(dev, name);
+		if (!ofnode_valid(plloff[i]))
+			continue;
+		ret = ofnode_read_u32_array(plloff[i], "cfg",
+					    pllcfg[i], PLLCFG_NB);
+		if (ret < 0) {
+			debug("field cfg invalid: error %d\n", ret);
+			return -FDT_ERR_NOTFOUND;
+		}
+	}
+
+	debug("configuration MCO\n");
+	stm32mp1_mco_csg(priv, clksrc[CLKSRC_MCO1], clkdiv[CLKDIV_MCO1]);
+	stm32mp1_mco_csg(priv, clksrc[CLKSRC_MCO2], clkdiv[CLKDIV_MCO2]);
+
+	debug("switch ON osillator\n");
+	/*
+	 * switch ON oscillator found in device-tree,
+	 * HSI already ON after bootrom
+	 */
+	if (priv->osc[_LSI])
+		stm32mp1_lsi_set(rcc, 1);
+
+	if (priv->osc[_LSE]) {
+		int bypass;
+		int lsedrv;
+		struct udevice *dev = priv->osc_dev[_LSE];
+
+		bypass = dev_read_bool(dev, "st,bypass");
+		lse_css = dev_read_bool(dev, "st,css");
+		lsedrv = dev_read_u32_default(dev, "st,drive",
+					      LSEDRV_MEDIUM_HIGH);
+
+		stm32mp1_lse_enable(rcc, bypass, lsedrv);
+	}
+
+	if (priv->osc[_HSE]) {
+		int bypass, css;
+		struct udevice *dev = priv->osc_dev[_HSE];
+
+		bypass = dev_read_bool(dev, "st,bypass");
+		css = dev_read_bool(dev, "st,css");
+
+		stm32mp1_hse_enable(rcc, bypass, css);
+	}
+	/* CSI is mandatory for automatic I/O compensation (SYSCFG_CMPCR)
+	 * => switch on CSI even if node is not present in device tree
+	 */
+	stm32mp1_csi_set(rcc, 1);
+
+	/* come back to HSI */
+	debug("come back to HSI\n");
+	set_clksrc(priv, CLK_MPU_HSI);
+	set_clksrc(priv, CLK_AXI_HSI);
+	set_clksrc(priv, CLK_MCU_HSI);
+
+	debug("pll stop\n");
+	for (i = 0; i < _PLL_NB; i++)
+		pll_stop(priv, i);
+
+	/* configure HSIDIV */
+	debug("configure HSIDIV\n");
+	if (priv->osc[_HSI])
+		stm32mp1_hsidiv(rcc, priv->osc[_HSI]);
+
+	/* select DIV */
+	debug("select DIV\n");
+	/* no ready bit when MPUSRC != CLK_MPU_PLL1P_DIV, MPUDIV is disabled */
+	writel(clkdiv[CLKDIV_MPU] & RCC_DIVR_DIV_MASK, rcc + RCC_MPCKDIVR);
+	set_clkdiv(clkdiv[CLKDIV_AXI], rcc + RCC_AXIDIVR);
+	set_clkdiv(clkdiv[CLKDIV_APB4], rcc + RCC_APB4DIVR);
+	set_clkdiv(clkdiv[CLKDIV_APB5], rcc + RCC_APB5DIVR);
+	set_clkdiv(clkdiv[CLKDIV_MCU], rcc + RCC_MCUDIVR);
+	set_clkdiv(clkdiv[CLKDIV_APB1], rcc + RCC_APB1DIVR);
+	set_clkdiv(clkdiv[CLKDIV_APB2], rcc + RCC_APB2DIVR);
+	set_clkdiv(clkdiv[CLKDIV_APB3], rcc + RCC_APB3DIVR);
+
+	/* no ready bit for RTC */
+	writel(clkdiv[CLKDIV_RTC] & RCC_DIVR_DIV_MASK, rcc + RCC_RTCDIVR);
+
+	/* configure PLLs source */
+	debug("configure PLLs source\n");
+	set_clksrc(priv, clksrc[CLKSRC_PLL12]);
+	set_clksrc(priv, clksrc[CLKSRC_PLL3]);
+	set_clksrc(priv, clksrc[CLKSRC_PLL4]);
+
+	/* configure and start PLLs */
+	debug("configure PLLs\n");
+	for (i = 0; i < _PLL_NB; i++) {
+		u32 fracv;
+		u32 csg[PLLCSG_NB];
+
+		debug("configure PLL %d @ %d\n", i,
+		      ofnode_to_offset(plloff[i]));
+		if (!ofnode_valid(plloff[i]))
+			continue;
+
+		fracv = ofnode_read_u32_default(plloff[i], "frac", 0);
+		pll_config(priv, i, pllcfg[i], fracv);
+		ret = ofnode_read_u32_array(plloff[i], "csg", csg, PLLCSG_NB);
+		if (!ret) {
+			pll_csg(priv, i, csg);
+		} else if (ret != -FDT_ERR_NOTFOUND) {
+			debug("invalid csg node for pll@%d res=%d\n", i, ret);
+			return ret;
+		}
+		pll_start(priv, i);
+	}
+
+	/* wait and start PLLs ouptut when ready */
+	for (i = 0; i < _PLL_NB; i++) {
+		if (!ofnode_valid(plloff[i]))
+			continue;
+		debug("output PLL %d\n", i);
+		pll_output(priv, i, pllcfg[i][PLLCFG_O]);
+	}
+
+	/* wait LSE ready before to use it */
+	if (priv->osc[_LSE])
+		stm32mp1_lse_wait(rcc);
+
+	/* configure with expected clock source */
+	debug("CLKSRC\n");
+	set_clksrc(priv, clksrc[CLKSRC_MPU]);
+	set_clksrc(priv, clksrc[CLKSRC_AXI]);
+	set_clksrc(priv, clksrc[CLKSRC_MCU]);
+	set_rtcsrc(priv, clksrc[CLKSRC_RTC], lse_css);
+
+	/* configure PKCK */
+	debug("PKCK\n");
+	pkcs_cell = dev_read_prop(dev, "st,pkcs", &len);
+	if (pkcs_cell) {
+		bool ckper_disabled = false;
+
+		for (i = 0; i < len / sizeof(u32); i++) {
+			u32 pkcs = (u32)fdt32_to_cpu(pkcs_cell[i]);
+
+			if (pkcs == CLK_CKPER_DISABLED) {
+				ckper_disabled = true;
+				continue;
+			}
+			pkcs_config(priv, pkcs);
+		}
+		/* CKPER is source for some peripheral clock
+		 * (FMC-NAND / QPSI-NOR) and switching source is allowed
+		 * only if previous clock is still ON
+		 * => deactivated CKPER only after switching clock
+		 */
+		if (ckper_disabled)
+			pkcs_config(priv, CLK_CKPER_DISABLED);
+	}
+
+	debug("oscillator off\n");
+	/* switch OFF HSI if not found in device-tree */
+	if (!priv->osc[_HSI])
+		stm32mp1_hsi_set(rcc, 0);
+
+	/* Software Self-Refresh mode (SSR) during DDR initilialization */
+	clrsetbits_le32(priv->base + RCC_DDRITFCR,
+			RCC_DDRITFCR_DDRCKMOD_MASK,
+			RCC_DDRITFCR_DDRCKMOD_SSR <<
+			RCC_DDRITFCR_DDRCKMOD_SHIFT);
+
+	return 0;
+}
+#endif /* STM32MP1_CLOCK_TREE_INIT */
+
 static void stm32mp1_osc_clk_init(const char *name,
 				  struct stm32mp1_clk_priv *priv,
 				  int index)
@@ -1133,6 +1703,12 @@ static int stm32mp1_clk_probe(struct udevice *dev)
 
 	stm32mp1_osc_init(dev);
 
+#ifdef STM32MP1_CLOCK_TREE_INIT
+	/* clock tree init is done only one time, before relocation */
+	if (!(gd->flags & GD_FLG_RELOC))
+		result = stm32mp1_clktree(dev);
+#endif
+
 	return result;
 }
 
diff --git a/include/dt-bindings/clock/stm32mp1-clksrc.h b/include/dt-bindings/clock/stm32mp1-clksrc.h
new file mode 100644
index 0000000..19fd959
--- /dev/null
+++ b/include/dt-bindings/clock/stm32mp1-clksrc.h
@@ -0,0 +1,284 @@
+/*
+ * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
+ */
+
+#ifndef _DT_BINDINGS_CLOCK_STM32MP1_CLKSRC_H_
+#define _DT_BINDINGS_CLOCK_STM32MP1_CLKSRC_H_
+
+/* PLL output is enable when x=1, with x=p,q or r */
+#define PQR(p, q, r)	(((p) & 1) | (((q) & 1) << 1) | (((r) & 1) << 2))
+
+/* st,clksrc: mandatory clock source */
+
+#define CLK_MPU_HSI		0x00000200
+#define CLK_MPU_HSE		0x00000201
+#define CLK_MPU_PLL1P		0x00000202
+#define CLK_MPU_PLL1P_DIV	0x00000203
+
+#define CLK_AXI_HSI		0x00000240
+#define CLK_AXI_HSE		0x00000241
+#define CLK_AXI_PLL2P		0x00000242
+
+#define CLK_MCU_HSI		0x00000480
+#define CLK_MCU_HSE		0x00000481
+#define CLK_MCU_CSI		0x00000482
+#define CLK_MCU_PLL3P		0x00000483
+
+#define CLK_PLL12_HSI		0x00000280
+#define CLK_PLL12_HSE		0x00000281
+
+#define CLK_PLL3_HSI		0x00008200
+#define CLK_PLL3_HSE		0x00008201
+#define CLK_PLL3_CSI		0x00008202
+
+#define CLK_PLL4_HSI		0x00008240
+#define CLK_PLL4_HSE		0x00008241
+#define CLK_PLL4_CSI		0x00008242
+#define CLK_PLL4_I2SCKIN	0x00008243
+
+#define CLK_RTC_DISABLED	0x00001400
+#define CLK_RTC_LSE		0x00001401
+#define CLK_RTC_LSI		0x00001402
+#define CLK_RTC_HSE		0x00001403
+
+#define CLK_MCO1_HSI		0x00008000
+#define CLK_MCO1_HSE		0x00008001
+#define CLK_MCO1_CSI		0x00008002
+#define CLK_MCO1_LSI		0x00008003
+#define CLK_MCO1_LSE		0x00008004
+#define CLK_MCO1_DISABLED	0x0000800F
+
+#define CLK_MCO2_MPU		0x00008040
+#define CLK_MCO2_AXI		0x00008041
+#define CLK_MCO2_MCU		0x00008042
+#define CLK_MCO2_PLL4P		0x00008043
+#define CLK_MCO2_HSE		0x00008044
+#define CLK_MCO2_HSI		0x00008045
+#define CLK_MCO2_DISABLED	0x0000804F
+
+/* st,pkcs: peripheral kernel clock source */
+
+#define CLK_I2C12_PCLK1		0x00008C00
+#define CLK_I2C12_PLL4R		0x00008C01
+#define CLK_I2C12_HSI		0x00008C02
+#define CLK_I2C12_CSI		0x00008C03
+#define CLK_I2C12_DISABLED	0x00008C07
+
+#define CLK_I2C35_PCLK1		0x00008C40
+#define CLK_I2C35_PLL4R		0x00008C41
+#define CLK_I2C35_HSI		0x00008C42
+#define CLK_I2C35_CSI		0x00008C43
+#define CLK_I2C35_DISABLED	0x00008C47
+
+#define CLK_I2C46_PCLK5		0x00000C00
+#define CLK_I2C46_PLL3Q		0x00000C01
+#define CLK_I2C46_HSI		0x00000C02
+#define CLK_I2C46_CSI		0x00000C03
+#define CLK_I2C46_DISABLED	0x00000C07
+
+#define CLK_SAI1_PLL4Q		0x00008C80
+#define CLK_SAI1_PLL3Q		0x00008C81
+#define CLK_SAI1_I2SCKIN	0x00008C82
+#define CLK_SAI1_CKPER		0x00008C83
+#define CLK_SAI1_PLL3R		0x00008C84
+#define CLK_SAI1_DISABLED	0x00008C87
+
+#define CLK_SAI2_PLL4Q		0x00008CC0
+#define CLK_SAI2_PLL3Q		0x00008CC1
+#define CLK_SAI2_I2SCKIN	0x00008CC2
+#define CLK_SAI2_CKPER		0x00008CC3
+#define CLK_SAI2_SPDIF		0x00008CC4
+#define CLK_SAI2_PLL3R		0x00008CC5
+#define CLK_SAI2_DISABLED	0x00008CC7
+
+#define CLK_SAI3_PLL4Q		0x00008D00
+#define CLK_SAI3_PLL3Q		0x00008D01
+#define CLK_SAI3_I2SCKIN	0x00008D02
+#define CLK_SAI3_CKPER		0x00008D03
+#define CLK_SAI3_PLL3R		0x00008D04
+#define CLK_SAI3_DISABLED	0x00008D07
+
+#define CLK_SAI4_PLL4Q		0x00008D40
+#define CLK_SAI4_PLL3Q		0x00008D41
+#define CLK_SAI4_I2SCKIN	0x00008D42
+#define CLK_SAI4_CKPER		0x00008D43
+#define CLK_SAI4_PLL3R		0x00008D44
+#define CLK_SAI4_DISABLED	0x00008D47
+
+#define CLK_SPI2S1_PLL4P	0x00008D80
+#define CLK_SPI2S1_PLL3Q	0x00008D81
+#define CLK_SPI2S1_I2SCKIN	0x00008D82
+#define CLK_SPI2S1_CKPER	0x00008D83
+#define CLK_SPI2S1_PLL3R	0x00008D84
+#define CLK_SPI2S1_DISABLED	0x00008D87
+
+#define CLK_SPI2S23_PLL4P	0x00008DC0
+#define CLK_SPI2S23_PLL3Q	0x00008DC1
+#define CLK_SPI2S23_I2SCKIN	0x00008DC2
+#define CLK_SPI2S23_CKPER	0x00008DC3
+#define CLK_SPI2S23_PLL3R	0x00008DC4
+#define CLK_SPI2S23_DISABLED	0x00008DC7
+
+#define CLK_SPI45_PCLK2		0x00008E00
+#define CLK_SPI45_PLL4Q		0x00008E01
+#define CLK_SPI45_HSI		0x00008E02
+#define CLK_SPI45_CSI		0x00008E03
+#define CLK_SPI45_HSE		0x00008E04
+#define CLK_SPI45_DISABLED	0x00008E07
+
+#define CLK_SPI6_PCLK5		0x00000C40
+#define CLK_SPI6_PLL4Q		0x00000C41
+#define CLK_SPI6_HSI		0x00000C42
+#define CLK_SPI6_CSI		0x00000C43
+#define CLK_SPI6_HSE		0x00000C44
+#define CLK_SPI6_PLL3Q		0x00000C45
+#define CLK_SPI6_DISABLED	0x00000C47
+
+#define CLK_UART6_PCLK2		0x00008E40
+#define CLK_UART6_PLL4Q		0x00008E41
+#define CLK_UART6_HSI		0x00008E42
+#define CLK_UART6_CSI		0x00008E43
+#define CLK_UART6_HSE		0x00008E44
+#define CLK_UART6_DISABLED	0x00008E47
+
+#define CLK_UART24_PCLK1	0x00008E80
+#define CLK_UART24_PLL4Q	0x00008E81
+#define CLK_UART24_HSI		0x00008E82
+#define CLK_UART24_CSI		0x00008E83
+#define CLK_UART24_HSE		0x00008E84
+#define CLK_UART24_DISABLED	0x00008E87
+
+#define CLK_UART35_PCLK1	0x00008EC0
+#define CLK_UART35_PLL4Q	0x00008EC1
+#define CLK_UART35_HSI		0x00008EC2
+#define CLK_UART35_CSI		0x00008EC3
+#define CLK_UART35_HSE		0x00008EC4
+#define CLK_UART35_DISABLED	0x00008EC7
+
+#define CLK_UART78_PCLK1	0x00008F00
+#define CLK_UART78_PLL4Q	0x00008F01
+#define CLK_UART78_HSI		0x00008F02
+#define CLK_UART78_CSI		0x00008F03
+#define CLK_UART78_HSE		0x00008F04
+#define CLK_UART78_DISABLED	0x00008F07
+
+#define CLK_UART1_PCLK5		0x00000C80
+#define CLK_UART1_PLL3Q		0x00000C81
+#define CLK_UART1_HSI		0x00000C82
+#define CLK_UART1_CSI		0x00000C83
+#define CLK_UART1_PLL4Q		0x00000C84
+#define CLK_UART1_HSE		0x00000C85
+#define CLK_UART1_DISABLED	0x00000C87
+
+#define CLK_SDMMC12_HCLK6	0x00008F40
+#define CLK_SDMMC12_PLL3R	0x00008F41
+#define CLK_SDMMC12_PLL4P	0x00008F42
+#define CLK_SDMMC12_HSI		0x00008F43
+#define CLK_SDMMC12_DISABLED	0x00008F47
+
+#define CLK_SDMMC3_HCLK2	0x00008F80
+#define CLK_SDMMC3_PLL3R	0x00008F81
+#define CLK_SDMMC3_PLL4P	0x00008F82
+#define CLK_SDMMC3_HSI		0x00008F83
+#define CLK_SDMMC3_DISABLED	0x00008F87
+
+#define CLK_ETH_PLL4P		0x00008FC0
+#define CLK_ETH_PLL3Q		0x00008FC1
+#define CLK_ETH_DISABLED	0x00008FC3
+
+#define CLK_QSPI_ACLK		0x00009000
+#define CLK_QSPI_PLL3R		0x00009001
+#define CLK_QSPI_PLL4P		0x00009002
+#define CLK_QSPI_CKPER		0x00009003
+
+#define CLK_FMC_ACLK		0x00009040
+#define CLK_FMC_PLL3R		0x00009041
+#define CLK_FMC_PLL4P		0x00009042
+#define CLK_FMC_CKPER		0x00009043
+
+#define CLK_FDCAN_HSE		0x000090C0
+#define CLK_FDCAN_PLL3Q		0x000090C1
+#define CLK_FDCAN_PLL4Q		0x000090C2
+#define CLK_FDCAN_PLL4R		0x000090C3
+
+#define CLK_SPDIF_PLL4P		0x00009140
+#define CLK_SPDIF_PLL3Q		0x00009141
+#define CLK_SPDIF_HSI		0x00009142
+#define CLK_SPDIF_DISABLED	0x00009143
+
+#define CLK_CEC_LSE		0x00009180
+#define CLK_CEC_LSI		0x00009181
+#define CLK_CEC_CSI_DIV122	0x00009182
+#define CLK_CEC_DISABLED	0x00009183
+
+#define CLK_USBPHY_HSE		0x000091C0
+#define CLK_USBPHY_PLL4R	0x000091C1
+#define CLK_USBPHY_HSE_DIV2	0x000091C2
+#define CLK_USBPHY_DISABLED	0x000091C3
+
+#define CLK_USBO_PLL4R		0x800091C0
+#define CLK_USBO_USBPHY		0x800091C1
+
+#define CLK_RNG1_CSI		0x00000CC0
+#define CLK_RNG1_PLL4R		0x00000CC1
+#define CLK_RNG1_LSE		0x00000CC2
+#define CLK_RNG1_LSI		0x00000CC3
+
+#define CLK_RNG2_CSI		0x00009200
+#define CLK_RNG2_PLL4R		0x00009201
+#define CLK_RNG2_LSE		0x00009202
+#define CLK_RNG2_LSI		0x00009203
+
+#define CLK_CKPER_HSI		0x00000D00
+#define CLK_CKPER_CSI		0x00000D01
+#define CLK_CKPER_HSE		0x00000D02
+#define CLK_CKPER_DISABLED	0x00000D03
+
+#define CLK_STGEN_HSI		0x00000D40
+#define CLK_STGEN_HSE		0x00000D41
+#define CLK_STGEN_DISABLED	0x00000D43
+
+#define CLK_DSI_DSIPLL		0x00009240
+#define CLK_DSI_PLL4P		0x00009241
+
+#define CLK_ADC_PLL4R		0x00009280
+#define CLK_ADC_CKPER		0x00009281
+#define CLK_ADC_PLL3Q		0x00009282
+#define CLK_ADC_DISABLED	0x00009283
+
+#define CLK_LPTIM45_PCLK3	0x000092C0
+#define CLK_LPTIM45_PLL4P	0x000092C1
+#define CLK_LPTIM45_PLL3Q	0x000092C2
+#define CLK_LPTIM45_LSE		0x000092C3
+#define CLK_LPTIM45_LSI		0x000092C4
+#define CLK_LPTIM45_CKPER	0x000092C5
+#define CLK_LPTIM45_DISABLED	0x000092C7
+
+#define CLK_LPTIM23_PCLK3	0x00009300
+#define CLK_LPTIM23_PLL4Q	0x00009301
+#define CLK_LPTIM23_CKPER	0x00009302
+#define CLK_LPTIM23_LSE		0x00009303
+#define CLK_LPTIM23_LSI		0x00009304
+#define CLK_LPTIM23_DISABLED	0x00009307
+
+#define CLK_LPTIM1_PCLK1	0x00009340
+#define CLK_LPTIM1_PLL4P	0x00009341
+#define CLK_LPTIM1_PLL3Q	0x00009342
+#define CLK_LPTIM1_LSE		0x00009343
+#define CLK_LPTIM1_LSI		0x00009344
+#define CLK_LPTIM1_CKPER	0x00009345
+#define CLK_LPTIM1_DISABLED	0x00009347
+
+/* define for st,pll /csg */
+#define SSCG_MODE_CENTER_SPREAD	0
+#define SSCG_MODE_DOWN_SPREAD	1
+
+/* define for st,drive */
+#define LSEDRV_LOWEST		0
+#define LSEDRV_MEDIUM_LOW	1
+#define LSEDRV_MEDIUM_HIGH	2
+#define LSEDRV_HIGHEST		3
+
+#endif