[PATCH 5.15 001/123] clk: generalize devm_clk_get() a bit

Greg Kroah-Hartman
2022-12-12T13:25:11Z

From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

[ Upstream commit abae8e57e49aa75f6db76aa866c775721523908f ]

Allow to add an exit hook to devm managed clocks. Also use
clk_get_optional() in devm_clk_get_optional instead of open coding it.
The generalisation will be used in the next commit to add some more
devm_clk helpers.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <aardelean@deviqon.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20220520075737.758761-3-u.kleine-koenig@pengutronix.de
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Stable-dep-of: c61bfb1cb63d ("mmc: mtk-sd: Fix missing clk_disable_unprepare in msdc_of_clock_parse()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/clk/clk-devres.c | 66 +++++++++++++++++++++++++++++-----------
1 file changed, 49 insertions(+), 17 deletions(-)

diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c
index f9d5b7334341..c822f4ef1584 100644
--- a/drivers/clk/clk-devres.c
+++ b/drivers/clk/clk-devres.c
@@ -4,39 +4,71 @@
#include <linux/export.h>
#include <linux/gfp.h>

+struct devm_clk_state {
+ struct clk *clk;
+ void (*exit)(struct clk *clk);
+};
+
static void devm_clk_release(struct device *dev, void *res)
{
- clk_put(*(struct clk **)res);
+ struct devm_clk_state *state = *(struct devm_clk_state **)res;
+
+ if (state->exit)
+ state->exit(state->clk);
+
+ clk_put(state->clk);
}

-struct clk *devm_clk_get(struct device *dev, const char *id)
+static struct clk *__devm_clk_get(struct device *dev, const char *id,
+ struct clk *(*get)(struct device *dev, const char *id),
+ int (*init)(struct clk *clk),
+ void (*exit)(struct clk *clk))
{
- struct clk **ptr, *clk;
+ struct devm_clk_state *state;
+ struct clk *clk;
+ int ret;

- ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
- if (!ptr)
+ state = devres_alloc(devm_clk_release, sizeof(*state), GFP_KERNEL);
+ if (!state)
return ERR_PTR(-ENOMEM);

- clk = clk_get(dev, id);
- if (!IS_ERR(clk)) {
- *ptr = clk;
- devres_add(dev, ptr);
- } else {
- devres_free(ptr);
+ clk = get(dev, id);
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ goto err_clk_get;
}

+ if (init) {
+ ret = init(clk);
+ if (ret)
+ goto err_clk_init;
+ }
+
+ state->clk = clk;
+ state->exit = exit;
+
+ devres_add(dev, state);
+
return clk;
+
+err_clk_init:
+
+ clk_put(clk);
+err_clk_get:
+
+ devres_free(state);
+ return ERR_PTR(ret);
+}
+
+struct clk *devm_clk_get(struct device *dev, const char *id)
+{
+ return __devm_clk_get(dev, id, clk_get, NULL, NULL);
}
EXPORT_SYMBOL(devm_clk_get);

struct clk *devm_clk_get_optional(struct device *dev, const char *id)
{
- struct clk *clk = devm_clk_get(dev, id);
-
- if (clk == ERR_PTR(-ENOENT))
- return NULL;
-
- return clk;
+ return __devm_clk_get(dev, id, clk_get_optional, NULL, NULL);
}
EXPORT_SYMBOL(devm_clk_get_optional);

--
2.35.1