clk: scmi: register scmi clocks with CCF
Implements SCMI APIs to retrieve the number exposed SCMI clocks using
SCMI_PROTOCOL_ATTRIBUTES messages and the names of the clocks using
SCMI_CLOCK_ATTRIBUTES messages.
This change updates sandbox SCMI clock test driver to manage these
2 new message IDs.
Cc: Lukasz Majewski <lukma@denx.de>
Cc: Sean Anderson <seanga2@gmail.com>
Cc: Clement Leger <clement.leger@bootlin.com>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
diff --git a/drivers/clk/clk_scmi.c b/drivers/clk/clk_scmi.c
index 42fbab0..5702268 100644
--- a/drivers/clk/clk_scmi.c
+++ b/drivers/clk/clk_scmi.c
@@ -11,6 +11,52 @@
#include <scmi_agent.h>
#include <scmi_protocols.h>
#include <asm/types.h>
+#include <linux/clk-provider.h>
+
+static int scmi_clk_get_num_clock(struct udevice *dev, size_t *num_clocks)
+{
+ struct scmi_clk_protocol_attr_out out;
+ struct scmi_msg msg = {
+ .protocol_id = SCMI_PROTOCOL_ID_CLOCK,
+ .message_id = SCMI_PROTOCOL_ATTRIBUTES,
+ .out_msg = (u8 *)&out,
+ .out_msg_sz = sizeof(out),
+ };
+ int ret;
+
+ ret = devm_scmi_process_msg(dev, &msg);
+ if (ret)
+ return ret;
+
+ *num_clocks = out.attributes & SCMI_CLK_PROTO_ATTR_COUNT_MASK;
+
+ return 0;
+}
+
+static int scmi_clk_get_attibute(struct udevice *dev, int clkid, char **name)
+{
+ struct scmi_clk_attribute_in in = {
+ .clock_id = clkid,
+ };
+ struct scmi_clk_attribute_out out;
+ struct scmi_msg msg = {
+ .protocol_id = SCMI_PROTOCOL_ID_CLOCK,
+ .message_id = SCMI_CLOCK_ATTRIBUTES,
+ .in_msg = (u8 *)&in,
+ .in_msg_sz = sizeof(in),
+ .out_msg = (u8 *)&out,
+ .out_msg_sz = sizeof(out),
+ };
+ int ret;
+
+ ret = devm_scmi_process_msg(dev, &msg);
+ if (ret)
+ return ret;
+
+ *name = out.clock_name;
+
+ return 0;
+}
static int scmi_clk_gate(struct clk *clk, int enable)
{
@@ -88,6 +134,49 @@
return scmi_clk_get_rate(clk);
}
+static int scmi_clk_probe(struct udevice *dev)
+{
+ struct clk *clk;
+ size_t num_clocks, i;
+ int ret;
+
+ if (!CONFIG_IS_ENABLED(CLK_CCF))
+ return 0;
+
+ /* register CCF children: CLK UCLASS, no probed again */
+ if (device_get_uclass_id(dev->parent) == UCLASS_CLK)
+ return 0;
+
+ ret = scmi_clk_get_num_clock(dev, &num_clocks);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < num_clocks; i++) {
+ char *name;
+
+ if (!scmi_clk_get_attibute(dev, i, &name)) {
+ char *clock_name = strdup(name);
+
+ clk = kzalloc(sizeof(*clk), GFP_KERNEL);
+ if (!clk || !clock_name)
+ ret = -ENOMEM;
+ else
+ ret = clk_register(clk, dev->driver->name,
+ clock_name, dev->name);
+
+ if (ret) {
+ free(clk);
+ free(clock_name);
+ return ret;
+ }
+
+ clk_dm(i, clk);
+ }
+ }
+
+ return 0;
+}
+
static const struct clk_ops scmi_clk_ops = {
.enable = scmi_clk_enable,
.disable = scmi_clk_disable,
@@ -99,4 +188,5 @@
.name = "scmi_clk",
.id = UCLASS_CLK,
.ops = &scmi_clk_ops,
+ .probe = &scmi_clk_probe,
};