clk: scmi: check the clock state/parent/rate control permissions
Clock driver based on SCMI clock management protocol in Linux checks
clock state, parent and rate control permissions. To be consistent with
the kernel driver, add this check here. CLOCK_GET_PERMISSIONS is from
ARM System Control and Management Interface Platform Design Document 3.2.
When using common clock framework (CCF), use the clock signal ID to get
the clock registered by clk_register() in scmi_clk_probe(), and then
obatin the struct clk_scmi variable with container_of().
Signed-off-by: Alice Guo <alice.guo@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
diff --git a/include/scmi_protocols.h b/include/scmi_protocols.h
index 342a65a..519b906 100644
--- a/include/scmi_protocols.h
+++ b/include/scmi_protocols.h
@@ -731,6 +731,7 @@
/*
* SCMI Clock Protocol
*/
+#define CLOCK_PROTOCOL_VERSION_3_0 0x30000
enum scmi_clock_message_id {
SCMI_CLOCK_ATTRIBUTES = 0x3,
@@ -738,6 +739,7 @@
SCMI_CLOCK_RATE_GET = 0x6,
SCMI_CLOCK_CONFIG_SET = 0x7,
SCMI_CLOCK_PARENT_SET = 0xD,
+ SCMI_CLOCK_GET_PERMISSIONS = 0xF,
};
#define SCMI_CLK_PROTO_ATTR_COUNT_MASK GENMASK(15, 0)
@@ -776,6 +778,7 @@
struct scmi_clk_attribute_out {
s32 status;
u32 attributes;
+#define CLK_HAS_RESTRICTIONS(x) ((x) & BIT(1))
char clock_name[SCMI_CLOCK_NAME_LENGTH_MAX];
};
@@ -858,6 +861,27 @@
s32 status;
};
+/**
+ * @clock_id: Identifier for the clock device.
+ */
+struct scmi_clk_get_permissions_in {
+ u32 clock_id;
+};
+
+/**
+ * @status: Negative 32-bit integers are used to return error status codes.
+ * @permissions: Bit[31] Clock state control, Bit[30] Clock parent control,
+ * Bit[29] Clock rate control, Bits[28:0] Reserved, must be zero.
+ */
+struct scmi_clk_get_permissions_out {
+ s32 status;
+ u32 permissions;
+};
+
+#define SUPPORT_CLK_STAT_CONTROL BIT(31)
+#define SUPPORT_CLK_PARENT_CONTROL BIT(30)
+#define SUPPORT_CLK_RATE_CONTROL BIT(29)
+
/*
* SCMI Reset Domain Protocol
*/