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@pengutroni... 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);