Re: [PATCH v3 01/25] clk: fixed: add devm helper for clk_hw_register_fixed_factor()

[abhinavk@xxxxxxxxxxxxxx]

On 2021-03-27 04:02, Dmitry Baryshkov wrote:
> From: Daniel Palmer <daniel@xxxxxxxx>
>
> Add a devm helper for clk_hw_register_fixed_factor() so that drivers
> that internally
> register fixed factor clocks for things like dividers don't need to
> manually unregister
> them on remove or if probe fails.
>
> Signed-off-by: Daniel Palmer <daniel@xxxxxxxx>
> Link: 
> https://lore.kernel.org/r/20210211052206.2955988-4-daniel@xxxxxxxx
> Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Reviewed-by: Abhinav Kumar <abhinavk@xxxxxxxxxxxxxx>
> ---
>  drivers/clk/clk-fixed-factor.c | 39 ++++++++++++++++++++++++++++------
>  include/linux/clk-provider.h   |  4 +++-
>  2 files changed, 36 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/clk/clk-fixed-factor.c 
> b/drivers/clk/clk-fixed-factor.c
> index 910e6e74ae90..4f7bf3929d6d 100644
> --- a/drivers/clk/clk-fixed-factor.c
> +++ b/drivers/clk/clk-fixed-factor.c
> @@ -64,10 +64,16 @@ const struct clk_ops clk_fixed_factor_ops = {
>  };
>  EXPORT_SYMBOL_GPL(clk_fixed_factor_ops);
>
> +static void devm_clk_hw_register_fixed_factor_release(struct device
> *dev, void *res)
> +{
> +	clk_hw_unregister_fixed_factor(&((struct clk_fixed_factor 
> *)res)->hw);
> +}
> +
>  static struct clk_hw *
>  __clk_hw_register_fixed_factor(struct device *dev, struct device_node 
> *np,
>  		const char *name, const char *parent_name, int index,
> -		unsigned long flags, unsigned int mult, unsigned int div)
> +		unsigned long flags, unsigned int mult, unsigned int div,
> +		bool devm)
>  {
>  	struct clk_fixed_factor *fix;
>  	struct clk_init_data init = { };
> @@ -75,7 +81,15 @@ __clk_hw_register_fixed_factor(struct device *dev,
> struct device_node *np,
>  	struct clk_hw *hw;
>  	int ret;
>
> -	fix = kmalloc(sizeof(*fix), GFP_KERNEL);
> +	/* You can't use devm without a dev */
> +	if (devm && !dev)
> +		return ERR_PTR(-EINVAL);
> +
> +	if (devm)
> +		fix = devres_alloc(devm_clk_hw_register_fixed_factor_release,
> +				sizeof(*fix), GFP_KERNEL);
> +	else
> +		fix = kmalloc(sizeof(*fix), GFP_KERNEL);
>  	if (!fix)
>  		return ERR_PTR(-ENOMEM);
>
> @@ -99,9 +113,13 @@ __clk_hw_register_fixed_factor(struct device *dev,
> struct device_node *np,
>  	else
>  		ret = of_clk_hw_register(np, hw);
>  	if (ret) {
> -		kfree(fix);
> +		if (devm)
> +			devres_free(fix);
> +		else
> +			kfree(fix);
>  		hw = ERR_PTR(ret);
> -	}
> +	} else if (devm)
> +		devres_add(dev, fix);
>
>  	return hw;
>  }
> @@ -111,7 +129,7 @@ struct clk_hw *clk_hw_register_fixed_factor(struct
> device *dev,
>  		unsigned int mult, unsigned int div)
>  {
>  	return __clk_hw_register_fixed_factor(dev, NULL, name, parent_name, 
> -1,
> -					      flags, mult, div);
> +					      flags, mult, div, false);
>  }
>  EXPORT_SYMBOL_GPL(clk_hw_register_fixed_factor);
>
> @@ -153,6 +171,15 @@ void clk_hw_unregister_fixed_factor(struct clk_hw 
> *hw)
>  }
>  EXPORT_SYMBOL_GPL(clk_hw_unregister_fixed_factor);
>
> +struct clk_hw *devm_clk_hw_register_fixed_factor(struct device *dev,
> +		const char *name, const char *parent_name, unsigned long flags,
> +		unsigned int mult, unsigned int div)
> +{
> +	return __clk_hw_register_fixed_factor(dev, NULL, name, parent_name, 
> -1,
> +			flags, mult, div, true);
> +}
> +EXPORT_SYMBOL_GPL(devm_clk_hw_register_fixed_factor);
> +
>  #ifdef CONFIG_OF
>  static const struct of_device_id set_rate_parent_matches[] = {
>  	{ .compatible = "allwinner,sun4i-a10-pll3-2x-clk" },
> @@ -185,7 +212,7 @@ static struct clk_hw
> *_of_fixed_factor_clk_setup(struct device_node *node)
>  		flags |= CLK_SET_RATE_PARENT;
>
>  	hw = __clk_hw_register_fixed_factor(NULL, node, clk_name, NULL, 0,
> -					    flags, mult, div);
> +					    flags, mult, div, false);
>  	if (IS_ERR(hw)) {
>  		/*
>  		 * Clear OF_POPULATED flag so that clock registration can be
> diff --git a/include/linux/clk-provider.h 
> b/include/linux/clk-provider.h
> index e4316890661a..58f6fe866ae9 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -941,7 +941,9 @@ struct clk_hw *clk_hw_register_fixed_factor(struct
> device *dev,
>  		const char *name, const char *parent_name, unsigned long flags,
>  		unsigned int mult, unsigned int div);
>  void clk_hw_unregister_fixed_factor(struct clk_hw *hw);
> -
> +struct clk_hw *devm_clk_hw_register_fixed_factor(struct device *dev,
> +		const char *name, const char *parent_name, unsigned long flags,
> +		unsigned int mult, unsigned int div);
>  /**
>   * struct clk_fractional_divider - adjustable fractional divider clock
>   *
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