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clk: fixed_rate: add API for directly registering fixed rate clocks

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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>
This commit is contained in:
Tero Kristo 2021-06-11 11:45:06 +03:00 • committed by Lokesh Vutla
parent 481d394e77
commit fc960cb6fb
2 changed files with 48 additions and 0 deletions
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45
drivers/clk/clk_fixed_rate.c
View file

@ -9,6 +9,9 @@
#include <dm/device-internal.h> #include <dm/device-internal.h>
#include <linux/clk-provider.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) static ulong clk_fixed_rate_get_rate(struct clk *clk)
{ {
return to_clk_fixed_rate(clk->dev)->fixed_rate; 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; 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) static int clk_fixed_rate_of_to_plat(struct udevice *dev)
{ {
clk_fixed_rate_ofdata_to_plat_(dev, to_clk_fixed_rate(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; 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[] = { static const struct udevice_id clk_fixed_rate_match[] = {
{ {
.compatible = "fixed-clock", .compatible = "fixed-clock",
@ -63,3 +101,10 @@ U_BOOT_DRIVER(fixed_clock) = {
.ops = &clk_fixed_rate_ops, .ops = &clk_fixed_rate_ops,
.flags = DM_FLAG_PRE_RELOC, .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,
};

3
include/linux/clk-provider.h
View file

@ -247,6 +247,9 @@ struct clk *clk_register_mux(struct device *dev, const char *name,
void __iomem *reg, u8 shift, u8 width, void __iomem *reg, u8 shift, u8 width,
u8 clk_mux_flags); 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); const char *clk_hw_get_name(const struct clk *hw);
ulong clk_generic_get_rate(struct clk *clk); ulong clk_generic_get_rate(struct clk *clk);