[PATCH v2 3/4] clk: add clock driver for SCMI agents

[Simon Glass]

On Tue, 18 Aug 2020 at 09:44, Etienne Carriere
<etienne.carriere at linaro.org> wrote:
>
> This change introduces a clock driver for SCMI agent devices. When
> SCMI agent and SCMI clock drivers are enabled, SCMI agent binds a
> clock device for each SCMI clock protocol devices enabled in the FDT.
>
> SCMI clock driver is embedded upon CONFIG_CLK_SCMI=y. If enabled,
> CONFIG_SCMI_AGENT is also enabled.
>
> SCMI Clock protocol is defined in the SCMI specification [1].
>
> Links: [1] https://developer.arm.com/architectures/system-architectures/software-standards/scmi
> Signed-off-by: Etienne Carriere <etienne.carriere at linaro.org>
> Cc: Lukasz Majewski <lukma at denx.de>
> Cc: Simon Glass <sjg at chromium.org>
> Cc: Peng Fan <peng.fan at nxp.com>
> Cc: Sudeep Holla <sudeep.holla at arm.com>
> ---
>
> Changes in v2:
> - CONFIG_CLK_SCMI depends on CONFIG_SCMI_FIRMWARE instead of
>   selecting CONFIG_SCMI_FIRMWARE.
> - Add inline comment description for structures and moves them to
>   source file top. Add/fixup some functions inline description comments.
> - Replace rc with ret as return value local variable label.
> - Fix scmi_clk_get_rate() return value to propagate error number.
> - Fix scmi_clk_set_rate() to request synchronous rate set operation:
>   drop flag SCMI_CLK_RATE_ASYNC_NORESP in the SCMI message payload.
> - Fix scmi_clk_set_rate() return value to return clock effective rate
>   on success.
> ---
>  drivers/clk/Kconfig     |   8 ++
>  drivers/clk/Makefile    |   1 +
>  drivers/clk/clk_scmi.c  | 186 ++++++++++++++++++++++++++++++++++++++++
>  drivers/firmware/scmi.c |   3 +
>  4 files changed, 198 insertions(+)
>  create mode 100644 drivers/clk/clk_scmi.c
>

Reviewed-by: Simon Glass <sjg at chromium.org>