* [PATCH v3 4/6] DEV: CLK: add function to check the using clock name of driver.
@ 2018-11-25 16:21 Hao Zhang
2018-11-26 15:26 ` Thierry Reding
0 siblings, 1 reply; 2+ messages in thread
From: Hao Zhang @ 2018-11-25 16:21 UTC (permalink / raw)
To: robh+dt, mark.rutland, maxime.ripard, wens, mturquette, sboyd,
thierry.reding
Cc: linux-gpio, linux-kernel, devicetree, linux-arm-kernel,
linux-pwm, linux-sunxi, hao5781286
In some situation we want to check clock whether is we want
and after the driver been probed use to change different clock source.
Signed-off-by: Hao Zhang <hao5781286@gmail.com>
---
drivers/clk/clk.c | 6 ++++++
include/linux/clk-provider.h | 1 +
2 files changed, 7 insertions(+)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d31055a..3d2c2cd 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3466,6 +3466,12 @@ static int devm_clk_hw_match(struct device *dev, void *res, void *data)
return hw == data;
}
+bool devm_clk_name_match(struct clk *clk, const char *string)
+{
+ return match_string(&clk->con_id, 1, string) == 0;
+}
+EXPORT_SYMBOL_GPL(devm_clk_name_match);
+
/**
* devm_clk_unregister - resource managed clk_unregister()
* @clk: clock to unregister
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 08b1aa7..5cd2eed 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -764,6 +764,7 @@ struct clk *devm_clk_register(struct device *dev, struct clk_hw *hw);
int __must_check clk_hw_register(struct device *dev, struct clk_hw *hw);
int __must_check devm_clk_hw_register(struct device *dev, struct clk_hw *hw);
+bool devm_clk_name_match(struct clk *clk, const char *string);
void clk_unregister(struct clk *clk);
void devm_clk_unregister(struct device *dev, struct clk *clk);
--
2.7.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v3 4/6] DEV: CLK: add function to check the using clock name of driver.
2018-11-25 16:21 [PATCH v3 4/6] DEV: CLK: add function to check the using clock name of driver Hao Zhang
@ 2018-11-26 15:26 ` Thierry Reding
0 siblings, 0 replies; 2+ messages in thread
From: Thierry Reding @ 2018-11-26 15:26 UTC (permalink / raw)
To: Hao Zhang
Cc: robh+dt, mark.rutland, maxime.ripard, wens, mturquette, sboyd,
linux-gpio, linux-kernel, devicetree, linux-arm-kernel,
linux-pwm, linux-sunxi
[-- Attachment #1: Type: text/plain, Size: 2265 bytes --]
On Mon, Nov 26, 2018 at 12:21:18AM +0800, Hao Zhang wrote:
> In some situation we want to check clock whether is we want
> and after the driver been probed use to change different clock source.
>
> Signed-off-by: Hao Zhang <hao5781286@gmail.com>
> ---
> drivers/clk/clk.c | 6 ++++++
> include/linux/clk-provider.h | 1 +
> 2 files changed, 7 insertions(+)
This doesn't seem right. If you're going to change to to a different
clock source anyway, why would you even want to know what it was set
before that? Isn't that completely irrelevant?
But if you really need this, perhaps a combination of clk_get() and
clk_is_match() would be a better approach? Perhaps best to let Mike
and Stephen share their feelings about this kind of API.
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index d31055a..3d2c2cd 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -3466,6 +3466,12 @@ static int devm_clk_hw_match(struct device *dev, void *res, void *data)
> return hw == data;
> }
>
> +bool devm_clk_name_match(struct clk *clk, const char *string)
> +{
> + return match_string(&clk->con_id, 1, string) == 0;
> +}
> +EXPORT_SYMBOL_GPL(devm_clk_name_match);
Also, there's nothing about this that would be device-managed, so the
devm_ prefix on the function name is misleading.
> /**
> * devm_clk_unregister - resource managed clk_unregister()
> * @clk: clock to unregister
> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> index 08b1aa7..5cd2eed 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -764,6 +764,7 @@ struct clk *devm_clk_register(struct device *dev, struct clk_hw *hw);
> int __must_check clk_hw_register(struct device *dev, struct clk_hw *hw);
> int __must_check devm_clk_hw_register(struct device *dev, struct clk_hw *hw);
>
> +bool devm_clk_name_match(struct clk *clk, const char *string);
> void clk_unregister(struct clk *clk);
> void devm_clk_unregister(struct device *dev, struct clk *clk);
You use this from clock consumers, so clk-provider.h is not the right
place for it. Also, you'll want to add a dummy implementation for the
case where CONFIG_COMMON_CLK is not set.
Thierry
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2018-11-26 15:26 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-11-25 16:21 [PATCH v3 4/6] DEV: CLK: add function to check the using clock name of driver Hao Zhang
2018-11-26 15:26 ` Thierry Reding
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).