linux-kernel - Re: [PATCH v4 5/6] pwm: meson: don't carry internal clock elements around

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Date: Wed, 24 Jan 2024 10:02:40 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Jerome Brunet <jbrunet@...libre.com>
Cc: Thierry Reding <thierry.reding@...il.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Kevin Hilman <khilman@...libre.com>, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-amlogic@...ts.infradead.org, linux-pwm@...r.kernel.org, JunYi Zhao <junyi.zhao@...ogic.com>
Subject: Re: [PATCH v4 5/6] pwm: meson: don't carry internal clock elements
 around

On Fri, Dec 22, 2023 at 12:16:53PM +0100, Jerome Brunet wrote:
> Pointers to the internal clock elements of the PWM are useless
> after probe. There is no need to carry this around in the device
> data. Just let devres deal with it.
> 
> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
> ---
>  drivers/pwm/pwm-meson.c | 67 ++++++++++++++++++++++++-----------------
>  1 file changed, 39 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
> index 15c44185d784..fb113bc8da29 100644
> --- a/drivers/pwm/pwm-meson.c
> +++ b/drivers/pwm/pwm-meson.c
> @@ -90,9 +90,6 @@ struct meson_pwm_channel {
>  	unsigned int hi;
>  	unsigned int lo;
>  
> -	struct clk_mux mux;
> -	struct clk_divider div;
> -	struct clk_gate gate;
>  	struct clk *clk;
>  };
>  
> @@ -442,6 +439,13 @@ static int meson_pwm_init_channels(struct device *dev)
>  		struct meson_pwm_channel *channel = &meson->channels[i];
>  		struct clk_parent_data div_parent = {}, gate_parent = {};
>  		struct clk_init_data init = {};
> +		struct clk_divider *div;
> +		struct clk_gate *gate;
> +		struct clk_mux *mux;
> +
> +		mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
> +		if (!mux)
> +			return -ENOMEM;

I don't like this change. While it doesn't increase the memory used, it
fragments the used memory and increases the overhead of memory
management and the number of devm allocations.

Are these members of meson_pwm_channel in the way for anything later?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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