[PATCHv6 05/26] clk: fixed_rate: add API for directly registering fixed rate clocks

Tero Kristo
2021-06-11T08:46:58Z

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 | 45 ++++++++++++++++++++++++++++++++++++
include/linux/clk-provider.h | 3 +++
2 files changed, 48 insertions(+)

diff --git a/drivers/clk/clk_fixed_rate.c b/drivers/clk/clk_fixed_rate.c
index 09f9ef26a4..325a9b2dcf 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 +59,32 @@ static int clk_fixed_rate_of_to_plat(struct udevice *dev)
return 0;
}

+#if CONFIG_IS_ENABLED(CLK_CCF)
+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;
+}
+#endif
+
static const struct udevice_id clk_fixed_rate_match[] = {
{
.compatible = "fixed-clock",
@@ -63,3 +101,10 @@ 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