On Wed, 9 Sep 2020 at 10:44, Etienne Carriere etienne.carriere@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-standa... Signed-off-by: Etienne Carriere etienne.carriere@linaro.org Cc: Lukasz Majewski lukma@denx.de Cc: Simon Glass sjg@chromium.org Cc: Peng Fan peng.fan@nxp.com Cc: Sudeep Holla sudeep.holla@arm.com
Changes in v4:
- Condition DM_GET_DRIVER(scmi_clock) to IS_ENABLED(CONFIG_CLK_SCMI) to prevent a build error (linker) when CONFIG_CLK_SCMI is disabled.
Changes in v3:
- Rebased in the series without major conflict.
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 | 99 +++++++++++++++++++++++ drivers/firmware/scmi/scmi_agent-uclass.c | 14 +++- include/scmi_protocols.h | 78 ++++++++++++++++++ 5 files changed, 197 insertions(+), 3 deletions(-) create mode 100644 drivers/clk/clk_scmi.c
Reviewed-by: Simon Glass sjg@chromium.org