[PATCH v7 06/19] clk: scmi: add the command CLOCK_PARENT_SET

Alice Guo (OSS)
2025-03-05T13:30:03Z

From: Peng Fan <peng.fan@nxp.com>

This patch adds the command CLOCK_PARENT_SET that can be used to set the
parent of a clock. ARM SCMI Version 3.2 supports to change the parent of
a clock device.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Alice Guo <alice.guo@nxp.com>
Reviewed-by: Ye Li <ye.li@nxp.com>
---
drivers/clk/clk_scmi.c | 20 ++++++++++++++++++++
include/scmi_protocols.h | 19 +++++++++++++++++++
2 files changed, 39 insertions(+)

diff --git a/drivers/clk/clk_scmi.c b/drivers/clk/clk_scmi.c
index e42d2032d4..84333cdd0c 100644
--- a/drivers/clk/clk_scmi.c
+++ b/drivers/clk/clk_scmi.c
@@ -178,11 +178,31 @@ static int scmi_clk_probe(struct udevice *dev)
return 0;
}

+static int scmi_clk_set_parent(struct clk *clk, struct clk *parent)
+{
+ struct scmi_clk_parent_set_in in = {
+ .clock_id = clk->id,
+ .parent_clk = parent->id,
+ };
+ struct scmi_clk_parent_set_out out;
+ struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_CLOCK,
+ SCMI_CLOCK_PARENT_SET,
+ in, out);
+ int ret;
+
+ ret = devm_scmi_process_msg(clk->dev, &msg);
+ if (ret < 0)
+ return ret;
+
+ return scmi_to_linux_errno(out.status);
+}
+
static const struct clk_ops scmi_clk_ops = {
.enable = scmi_clk_enable,
.disable = scmi_clk_disable,
.get_rate = scmi_clk_get_rate,
.set_rate = scmi_clk_set_rate,
+ .set_parent = scmi_clk_set_parent,
};

U_BOOT_DRIVER(scmi_clock) = {
diff --git a/include/scmi_protocols.h b/include/scmi_protocols.h
index 34f272c448..0d8c177025 100644
--- a/include/scmi_protocols.h
+++ b/include/scmi_protocols.h
@@ -737,6 +737,7 @@ enum scmi_clock_message_id {
SCMI_CLOCK_RATE_SET = 0x5,
SCMI_CLOCK_RATE_GET = 0x6,
SCMI_CLOCK_CONFIG_SET = 0x7,
+ SCMI_CLOCK_PARENT_SET = 0xD
};

#define SCMI_CLK_PROTO_ATTR_COUNT_MASK GENMASK(15, 0)
@@ -839,6 +840,24 @@ struct scmi_clk_rate_set_out {
s32 status;
};

+/**
+ * struct scmi_clk_parent_state_in - Message payload for CLOCK_PARENT_SET command
+ * @clock_id: SCMI clock ID
+ * @parent_clk: SCMI clock ID
+ */
+struct scmi_clk_parent_set_in {
+ u32 clock_id;
+ u32 parent_clk;
+};
+
+/**
+ * struct scmi_clk_parent_set_out - Response payload for CLOCK_PARENT_SET command
+ * @status: SCMI command status
+ */
+struct scmi_clk_parent_set_out {
+ s32 status;
+};
+
/*
* SCMI Reset Domain Protocol
*/

--
2.43.0