linux-kernel - Re: [PATCH] power: reset: vexpress: Use device_get_match

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Message-ID: <ZSR5pd_Uzk0s2XZw@e110455-lin.cambridge.arm.com>
Date:   Mon, 9 Oct 2023 23:07:33 +0100
From:   Liviu Dudau <liviu.dudau@....com>
To:     Rob Herring <robh@...nel.org>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] power: reset: vexpress: Use device_get_match_data()

Hi Rob,

On Mon, Oct 09, 2023 at 12:29:14PM -0500, Rob Herring wrote:
> Use preferred device_get_match_data() instead of of_match_device() to
> get the driver match data. With this, adjust the includes to explicitly
> include the correct headers.
> 
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
>  drivers/power/reset/vexpress-poweroff.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/power/reset/vexpress-poweroff.c b/drivers/power/reset/vexpress-poweroff.c
> index 17064d7b19f6..bb22b2db5907 100644
> --- a/drivers/power/reset/vexpress-poweroff.c
> +++ b/drivers/power/reset/vexpress-poweroff.c
> @@ -7,8 +7,8 @@
>  #include <linux/delay.h>
>  #include <linux/notifier.h>
>  #include <linux/of.h>
> -#include <linux/of_device.h>
>  #include <linux/platform_device.h>
> +#include <linux/property.h>
>  #include <linux/reboot.h>
>  #include <linux/stat.h>
>  #include <linux/vexpress.h>
> @@ -108,20 +108,17 @@ static int _vexpress_register_restart_handler(struct device *dev)
>  
>  static int vexpress_reset_probe(struct platform_device *pdev)
>  {
> -	const struct of_device_id *match =
> -			of_match_device(vexpress_reset_of_match, &pdev->dev);
> +	enum vexpress_reset_func func;
>  	struct regmap *regmap;
>  	int ret = 0;
>  
> -	if (!match)
> -		return -EINVAL;
> -
>  	regmap = devm_regmap_init_vexpress_config(&pdev->dev);
>  	if (IS_ERR(regmap))
>  		return PTR_ERR(regmap);
>  	dev_set_drvdata(&pdev->dev, regmap);
>  
> -	switch ((uintptr_t)match->data) {
> +	func = (uintptr_t)device_get_match_data(&pdev->dev);
> +	switch (func) {
>  	case FUNC_SHUTDOWN:
>  		vexpress_power_off_device = &pdev->dev;
>  		pm_power_off = vexpress_power_off;

device_get_match_data() is badly un-documented but I think it can still
return NULL if no match. At the moment we're checking for a match earlier
and avoid calling devm_regmap_init_vexpress_config() needlessly, with your
patch not so. Can you not replace each line with the equivalent code and
keep the NULL check?

Best regards,
Liviu


> -- 
> 2.42.0
> 

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