[PATCHv4 05/26] clk: fixed_rate: add API for directly registering fixed rate clocks

[Tero Kristo <kristo@kernel.org>]

From: Tero Kristo <t-kristo@ti.com>

Current driver only supports registering fixed rate clocks from DT. Add
new API which makes it possible to register fixed rate clocks directly
from e.g. platform specific clock drivers.

Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tero Kristo <kristo@kernel.org>
---
 drivers/clk/clk_fixed_rate.c | 43 ++++++++++++++++++++++++++++++++++++
 include/linux/clk-provider.h |  3 +++
 2 files changed, 46 insertions(+)

diff --git a/drivers/clk/clk_fixed_rate.c b/drivers/clk/clk_fixed_rate.c
index 09f9ef26a4..c591abf685 100644
--- a/drivers/clk/clk_fixed_rate.c
+++ b/drivers/clk/clk_fixed_rate.c
@@ -9,6 +9,9 @@
 #include <dm/device-internal.h>
 #include <linux/clk-provider.h>
 
+#define UBOOT_DM_CLK_FIXED_RATE "fixed_rate_clock"
+#define UBOOT_DM_CLK_FIXED_RATE_RAW "fixed_rate_raw_clock"
+
 static ulong clk_fixed_rate_get_rate(struct clk *clk)
 {
 	return to_clk_fixed_rate(clk->dev)->fixed_rate;
@@ -40,6 +43,15 @@ void clk_fixed_rate_ofdata_to_plat_(struct udevice *dev,
 	clk->enable_count = 0;
 }
 
+static ulong clk_fixed_rate_raw_get_rate(struct clk *clk)
+{
+	return container_of(clk, struct clk_fixed_rate, clk)->fixed_rate;
+}
+
+const struct clk_ops clk_fixed_rate_raw_ops = {
+	.get_rate = clk_fixed_rate_raw_get_rate,
+};
+
 static int clk_fixed_rate_of_to_plat(struct udevice *dev)
 {
 	clk_fixed_rate_ofdata_to_plat_(dev, to_clk_fixed_rate(dev));
@@ -47,6 +59,30 @@ static int clk_fixed_rate_of_to_plat(struct udevice *dev)
 	return 0;
 }
 
+struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
+				    ulong rate)
+{
+	struct clk *clk;
+	struct clk_fixed_rate *fixed;
+	int ret;
+
+	fixed = kzalloc(sizeof(*fixed), GFP_KERNEL);
+	if (!fixed)
+		return ERR_PTR(-ENOMEM);
+
+	fixed->fixed_rate = rate;
+
+	clk = &fixed->clk;
+
+	ret = clk_register(clk, UBOOT_DM_CLK_FIXED_RATE_RAW, name, NULL);
+	if (ret) {
+		kfree(fixed);
+		return ERR_PTR(ret);
+	}
+
+	return clk;
+}
+
 static const struct udevice_id clk_fixed_rate_match[] = {
 	{
 		.compatible = "fixed-clock",
@@ -63,3 +99,10 @@ U_BOOT_DRIVER(fixed_clock) = {
 	.ops = &clk_fixed_rate_ops,
 	.flags = DM_FLAG_PRE_RELOC,
 };
+
+U_BOOT_DRIVER(clk_fixed_rate_raw) = {
+	.name = UBOOT_DM_CLK_FIXED_RATE_RAW,
+	.id = UCLASS_CLK,
+	.ops = &clk_fixed_rate_raw_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 6fda14f5fe..9d296f240a 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -247,6 +247,9 @@ struct clk *clk_register_mux(struct device *dev, const char *name,
 		void __iomem *reg, u8 shift, u8 width,
 		u8 clk_mux_flags);
 
+struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
+				    ulong rate);
+
 const char *clk_hw_get_name(const struct clk *hw);
 ulong clk_generic_get_rate(struct clk *clk);
 
-- 
2.17.1