linux-kernel - Re: [PATCH 1/2] clk: add a clk_hw helpers to get the clock device or device

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Message-ID: <1jbjs7mmfb.fsf@starbuckisacylon.baylibre.com>
Date: Mon, 05 May 2025 11:33:44 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: Michael Turquette <mturquette@...libre.com>
Cc: Stephen Boyd <sboyd@...nel.org>,  linux-clk@...r.kernel.org,
  linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] clk: add a clk_hw helpers to get the clock device
 or device_node

On Thu 17 Apr 2025 at 15:44, Jerome Brunet <jbrunet@...libre.com> wrote:

> Add helpers to get the device or device_node associated with clk_hw.
>
> This can be used by clock drivers to access various device related
> functionality such as devres, dev_ prints, etc ...
>
> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
> ---

Hello Stephen,

If possible, could you take that change in so can move on with rework
I'm trying do in amlogic clocks, while we refine the test part ? (if
another round is needed for that)

Cheers

>  drivers/clk/clk.c            | 12 ++++++++++++
>  include/linux/clk-provider.h | 26 ++++++++++++++++++++++++++
>  2 files changed, 38 insertions(+)
>
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 0565c87656cf5c557d8259c71b5d2971a7ac87e8..b821b2cdb155331c85fafbd2fac8ab3703a08e4d 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -365,6 +365,18 @@ const char *clk_hw_get_name(const struct clk_hw *hw)
>  }
>  EXPORT_SYMBOL_GPL(clk_hw_get_name);
>  
> +struct device *clk_hw_get_dev(const struct clk_hw *hw)
> +{
> +	return hw->core->dev;
> +}
> +EXPORT_SYMBOL_GPL(clk_hw_get_dev);
> +
> +struct device_node *clk_hw_get_of_node(const struct clk_hw *hw)
> +{
> +	return hw->core->of_node;
> +}
> +EXPORT_SYMBOL_GPL(clk_hw_get_of_node);
> +
>  struct clk_hw *__clk_get_hw(struct clk *clk)
>  {
>  	return !clk ? NULL : clk->core->hw;
> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> index 2e6e603b749342931c0d0693c3e72b62c000791b..630705a47129453c241f1b1755f2c2f2a7ed8f77 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -1360,6 +1360,32 @@ void clk_hw_unregister(struct clk_hw *hw);
>  /* helper functions */
>  const char *__clk_get_name(const struct clk *clk);
>  const char *clk_hw_get_name(const struct clk_hw *hw);
> +
> +/**
> + * clk_hw_get_dev() - get device from an hardware clock.
> + * @hw: the clk_hw pointer to get the struct device from
> + *
> + * This is a helper to get the struct device associated with a hardware
> + * clock. Some clock controllers, such as the one registered with
> + * CLK_OF_DECLARE(), may have not provided a device pointer while
> + * registering the clock.
> + *
> + * Return: the struct device associated with the clock, or NULL if there
> + * is none.
> + */
> +struct device *clk_hw_get_dev(const struct clk_hw *hw);
> +
> +/**
> + * clk_hw_get_of_node() - get device_node from a hardware clock.
> + * @hw: the clk_hw pointer to get the struct device_node from
> + *
> + * This is a helper to get the struct device_node associated with a
> + * hardware clock.
> + *
> + * Return: the struct device_node associated with the clock, or NULL
> + * if there is none.
> + */
> +struct device_node *clk_hw_get_of_node(const struct clk_hw *hw);
>  #ifdef CONFIG_COMMON_CLK
>  struct clk_hw *__clk_get_hw(struct clk *clk);
>  #else

-- 
Jerome