clk: scmi: Port driver to the new scmi_clk_proto_ops interface

Port the scmi clock driver to the new SCMI clock interface based on
protocol handles and common devm_get_ops().

Link: https://lore.kernel.org/r/[e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Cc: Michael Turquette <[e-mail]>
Cc: Stephen Boyd <[e-mail]>
Reviewed-by: Stephen Boyd <[e-mail]>
Acked-by: Stephen Boyd <[e-mail]>
Tested-by: Florian Fainelli <[e-mail]>
Signed-off-by: Cristian Marussi <[e-mail]>
Signed-off-by: Sudeep Holla <[e-mail]>

drivers/clk/clk-scmi.c

···
 /*
  * System Control and Power Interface (SCMI) Protocol based clock driver
  *
- * Copyright (C) 2018 ARM Ltd.
+ * Copyright (C) 2018-2021 ARM Ltd.
  */
 
 #include <linux/clk-provider.h>
···
 #include <linux/scmi_protocol.h>
 #include <asm/div64.h>
 
+static const struct scmi_clk_proto_ops *scmi_proto_clk_ops;
+
 struct scmi_clk {
 	u32 id;
 	struct clk_hw hw;
 	const struct scmi_clock_info *info;
-	const struct scmi_handle *handle;
+	const struct scmi_protocol_handle *ph;
 };
 
 #define to_scmi_clk(clk) container_of(clk, struct scmi_clk, hw)
···
 	u64 rate;
 	struct scmi_clk *clk = to_scmi_clk(hw);
 
-	ret = clk->handle->clk_ops->rate_get(clk->handle, clk->id, &rate);
+	ret = scmi_proto_clk_ops->rate_get(clk->ph, clk->id, &rate);
 	if (ret)
 		return 0;
 	return rate;
···
 {
 	struct scmi_clk *clk = to_scmi_clk(hw);
 
-	return clk->handle->clk_ops->rate_set(clk->handle, clk->id, rate);
+	return scmi_proto_clk_ops->rate_set(clk->ph, clk->id, rate);
 }
 
 static int scmi_clk_enable(struct clk_hw *hw)
 {
 	struct scmi_clk *clk = to_scmi_clk(hw);
 
-	return clk->handle->clk_ops->enable(clk->handle, clk->id);
+	return scmi_proto_clk_ops->enable(clk->ph, clk->id);
 }
 
 static void scmi_clk_disable(struct clk_hw *hw)
 {
 	struct scmi_clk *clk = to_scmi_clk(hw);
 
-	clk->handle->clk_ops->disable(clk->handle, clk->id);
+	scmi_proto_clk_ops->disable(clk->ph, clk->id);
 }
 
 static const struct clk_ops scmi_clk_ops = {
···
 	struct device *dev = &sdev->dev;
 	struct device_node *np = dev->of_node;
 	const struct scmi_handle *handle = sdev->handle;
+	struct scmi_protocol_handle *ph;
 
-	if (!handle || !handle->clk_ops)
+	if (!handle)
 		return -ENODEV;
 
-	count = handle->clk_ops->count_get(handle);
+	scmi_proto_clk_ops =
+		handle->devm_protocol_get(sdev, SCMI_PROTOCOL_CLOCK, &ph);
+	if (IS_ERR(scmi_proto_clk_ops))
+		return PTR_ERR(scmi_proto_clk_ops);
+
+	count = scmi_proto_clk_ops->count_get(ph);
 	if (count < 0) {
 		dev_err(dev, "%pOFn: invalid clock output count\n", np);
 		return -EINVAL;
···
 		if (!sclk)
 			return -ENOMEM;
 
-		sclk->info = handle->clk_ops->info_get(handle, idx);
+		sclk->info = scmi_proto_clk_ops->info_get(ph, idx);
 		if (!sclk->info) {
 			dev_dbg(dev, "invalid clock info for idx %d\n", idx);
 			continue;
 		}
 
 		sclk->id = idx;
-		sclk->handle = handle;
+		sclk->ph = ph;
 
 		err = scmi_clk_ops_init(dev, sclk);
 		if (err) {