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

[Tero Kristo]

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.

Signed-off-by: Tero Kristo <t-kri...@ti.com>
---
 drivers/clk/clk_fixed_rate.c | 45 +++++++++++++++++++++++++++++++++++-
 include/linux/clk-provider.h |  3 +++
 2 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk_fixed_rate.c b/drivers/clk/clk_fixed_rate.c
index 55e1f8caa5..5556acaf86 100644
--- a/drivers/clk/clk_fixed_rate.c
+++ b/drivers/clk/clk_fixed_rate.c
@@ -8,6 +8,9 @@
 #include <dm.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;
@@ -24,6 +27,15 @@ const struct clk_ops clk_fixed_rate_ops = {
        .enable = dummy_enable,
 };
 
+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_ofdata_to_platdata(struct udevice *dev)
 {
        struct clk *clk = &to_clk_fixed_rate(dev)->clk;
@@ -39,6 +51,30 @@ static int clk_fixed_rate_ofdata_to_platdata(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",
@@ -47,7 +83,7 @@ static const struct udevice_id clk_fixed_rate_match[] = {
 };
 
 U_BOOT_DRIVER(clk_fixed_rate) = {
-       .name = "fixed_rate_clock",
+       .name = UBOOT_DM_CLK_FIXED_RATE,
        .id = UCLASS_CLK,
        .of_match = clk_fixed_rate_match,
        .ofdata_to_platdata = clk_fixed_rate_ofdata_to_platdata,
@@ -55,3 +91,10 @@ U_BOOT_DRIVER(clk_fixed_rate) = {
        .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 79dce8f0ad..6b50c42214 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -186,6 +186,9 @@ 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

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