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| author | Patrice Chotard <patrice.chotard@st.com> | 2018-02-08 17:20:47 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2018-03-13 21:45:37 -0400 |
| commit | 651a70e8d58281fdc034864ad5a8c905e5541c89 (patch) | |
| tree | e232ca28e0a82338535efbce219c0b77b560bd9c /drivers | |
| parent | 526aa92960cfea5d6799b5a6aae89e4e646acc67 (diff) | |
| download | u-boot-651a70e8d58281fdc034864ad5a8c905e5541c89.zip u-boot-651a70e8d58281fdc034864ad5a8c905e5541c89.tar.gz u-boot-651a70e8d58281fdc034864ad5a8c905e5541c89.tar.bz2 | |
clk: clk_stm32f: No more need of 48Mhz from PLL_SAI
Initially, 48Mhz for SDIO clock was generated from SAI pll for
STM32F469 and STM32F746 SoCs, but this solution was not suitable
for STM32F429 SoCs.
A generic solution is to used the PLL_Q output as 48Mhz clock
for all STM32F SOCs family.
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/clk/clk_stm32f.c | 29 |
1 files changed, 8 insertions, 21 deletions
diff --git a/drivers/clk/clk_stm32f.c b/drivers/clk/clk_stm32f.c index 7d89906..e8f6b47 100644 --- a/drivers/clk/clk_stm32f.c +++ b/drivers/clk/clk_stm32f.c @@ -128,7 +128,6 @@ static int configure_clocks(struct udevice *dev) struct stm32_rcc_regs *regs = priv->base; struct stm32_pwr_regs *pwr = priv->pwr_regs; struct pll_psc *sys_pll_psc = &priv->info.sys_pll_psc; - u32 pllsaicfgr = 0; /* Reset RCC configuration */ setbits_le32(®s->cr, RCC_CR_HSION); @@ -160,20 +159,10 @@ static int configure_clocks(struct udevice *dev) clrsetbits_le32(®s->pllcfgr, RCC_PLLCFGR_PLLQ_MASK, sys_pll_psc->pll_q << RCC_PLLCFGR_PLLQ_SHIFT); - /* Configure the SAI PLL to get a 48 MHz source */ - pllsaicfgr = RCC_PLLSAICFGR_PLLSAIR_2 | RCC_PLLSAICFGR_PLLSAIQ_4 | - RCC_PLLSAICFGR_PLLSAIP_4; - pllsaicfgr |= 192 << RCC_PLLSAICFGR_PLLSAIN_SHIFT; - writel(pllsaicfgr, ®s->pllsaicfgr); - - /* Enable the main PLL */ - setbits_le32(®s->cr, RCC_CR_PLLON); - while (!(readl(®s->cr) & RCC_CR_PLLRDY)) - ; - + /* configure SDMMC clock */ if (priv->info.v2) { /*stm32f7 case */ - /* select PLLSAI as 48MHz clock source */ - setbits_le32(®s->dckcfgr2, RCC_DCKCFGRX_CK48MSEL); + /* select PLLQ as 48MHz clock source */ + clrbits_le32(®s->dckcfgr2, RCC_DCKCFGRX_CK48MSEL); /* select 48MHz as SDMMC1 clock source */ clrbits_le32(®s->dckcfgr2, RCC_DCKCFGRX_SDMMC1SEL); @@ -181,16 +170,16 @@ static int configure_clocks(struct udevice *dev) /* select 48MHz as SDMMC2 clock source */ clrbits_le32(®s->dckcfgr2, RCC_DCKCFGR2_SDMMC2SEL); } else { /* stm32f4 case */ - /* select PLLSAI as 48MHz clock source */ - setbits_le32(®s->dckcfgr, RCC_DCKCFGRX_CK48MSEL); + /* select PLLQ as 48MHz clock source */ + clrbits_le32(®s->dckcfgr, RCC_DCKCFGRX_CK48MSEL); /* select 48MHz as SDMMC1 clock source */ clrbits_le32(®s->dckcfgr, RCC_DCKCFGRX_SDMMC1SEL); } - /* Enable the SAI PLL */ - setbits_le32(®s->cr, RCC_CR_PLLSAION); - while (!(readl(®s->cr) & RCC_CR_PLLSAIRDY)) + /* Enable the main PLL */ + setbits_le32(®s->cr, RCC_CR_PLLON); + while (!(readl(®s->cr) & RCC_CR_PLLRDY)) ; setbits_le32(®s->apb1enr, RCC_APB1ENR_PWREN); @@ -218,8 +207,6 @@ static int configure_clocks(struct udevice *dev) while ((readl(®s->cfgr) & RCC_CFGR_SWS_MASK) != RCC_CFGR_SWS_PLL) ; - /* gate the SAI clock, needed for MMC 1&2 clocks */ - setbits_le32(®s->apb2enr, RCC_APB2ENR_SAI1EN); #ifdef CONFIG_ETH_DESIGNWARE /* gate the SYSCFG clock, needed to set RMII ethernet interface */ |