Merge patch series "arm: Add Analog Devices SC5xx Machine Type"WIP/07May2024-next

Greg Malysa <greg.malysa@timesys.com> says:

This series adds support for the ADI SC5xx machine type and includes two
core drivers that are required for being able to boot any board--a UART
driver, the gptimer driver which is used as a clock reference (CNTVCNT
is not supported on the armv7 sc5xx SoCs) and the clock tree driver. Our
corresponding Linux support relies on u-boot configuring the clocks
correctly before booting, so it is not possible to boot any board
without the CGU/CDU configuration happening here. There are also no
board files, device trees, or defconfigs included here, but some common
definitions that will be used to build board files currently are. The
sc5xx SoCs themselves include many armv7 families (sc57x, sc58x, and
sc594) all using an ARM Cortex-A5, and one armv8 family (sc598) indended
to be a drop-in replacement for the SC594 in terms of peripherals, with
a Cortex-A55 instead.

Some of the configuration code in dmcinit and clkinit is quite scary and
causes a lot of checkpatch violations. It is modified from code
initially provided by ADI, but it has not been fully rewritten. There's
a question of how important it is to clean up this code--it has some
quality violations, but it has been in use (including in production) for
over two years and is known to work for performing the low level SoC
initialization, while a rewrite might introduce timing or sequence bugs
that could take a significant amount of time to detect in the future.

1 files changed, 83 insertions, 0 deletions

diff --git a/drivers/clk/adi/Kconfig b/drivers/clk/adi/Kconfig
new file mode 100644
index 0000000..5745bed
--- /dev/null
+++ b/drivers/clk/adi/Kconfig
@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# (C) Copyright 2022 - Analog Devices, Inc.
+#
+# Written and/or maintained by Timesys Corporation
+#
+# Contact: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
+# Contact: Greg Malysa <greg.malysa@timesys.com>
+#
+
+config COMMON_CLK_ADI_SHARED
+	bool "Enable shared ADI clock framework code"
+	help
+	  Required for shared code between SoC clock drivers. Automatically
+	  selected by an appropriate SoC-specific clock driver version.
+
+config COMMON_CLK_ADI_SC598
+	bool "Clock driver for ADI SC598 SoCs"
+	select DM
+	select CLK
+	select CLK_CCF
+	select OF_CONTROL
+	select CMD_CLK
+	select SPL_DM if SPL
+	select SPL_CLK if SPL
+	select SPL_CLK_CCF if SPL
+	select SPL_OF_CONTROL if SPL
+	select COMMON_CLK_ADI_SHARED
+	depends on SC59X_64
+	help
+	  This driver supports the system clocks on Analog Devices SC598-series
+	  SoCs. It includes CGU and CDU clocks and supports gating unused clocks.
+	  Modifying PLL configuration is not supported; that must be done prior
+	  to booting the kernel. Clock dividers after the PLLs may be configured.
+
+config COMMON_CLK_ADI_SC594
+	bool "Clock driver for ADI SC594 SoCs"
+	select DM
+	select CLK
+	select CLK_CCF
+	select OF_CONTROL
+	select CMD_CLK
+	select SPL_DM if SPL
+	select SPL_CLK if SPL
+	select SPL_CLK_CCF if SPL
+	select SPL_OF_CONTROL if SPL
+	select COMMON_CLK_ADI_SHARED
+	depends on SC59X
+	help
+	  This driver supports the system clocks on Analog Devices SC594-series
+	  SoCs. It includes CGU and CDU clocks and supports gating unused clocks.
+	  Modifying PLL configuration is not supported; that must be done prior
+	  to booting the kernel. Clock dividers after the PLLs may be configured.
+
+config COMMON_CLK_ADI_SC58X
+	bool "Clock driver for ADI SC58X SoCs"
+	select DM
+	select CLK
+	select CLK_CCF
+	select OF_CONTROL
+	select CMD_CLK
+	select COMMON_CLK_ADI_SHARED
+	depends on SC58X
+	help
+	  This driver supports the system clocks on Analog Devices SC58x-series
+	  SoCs. It includes CGU and CDU clocks and supports gating unused clocks.
+	  Modifying PLL configuration is not supported; that must be done prior
+	  to booting the kernel. Clock dividers after the PLLs may be configured.
+
+config COMMON_CLK_ADI_SC57X
+	bool "Clock driver for ADI SC57X SoCs"
+	select DM
+	select CLK
+	select CLK_CCF
+	select OF_CONTROL
+	select CMD_CLK
+	select COMMON_CLK_ADI_SHARED
+	depends on SC57X
+	help
+	  This driver supports the system clocks on Analog Devices SC57x-series
+	  SoCs. It includes CGU and CDU clocks and supports gating unused clocks.
+	  Modifying PLL configuration is not supported; that must be done prior
+	  to booting the kernel. Clock dividers after the PLLs may be configured.