linux-kernel - Re: [PATCH 3/5] power: reset: brcmstb: Use syscon_regmap_lookup_by_phandle

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Date: Tue, 11 Jun 2024 11:45:43 +0530
From: Dhruva Gole <d-gole@...com>
To: Andrew Davis <afd@...com>
CC: Sebastian Reichel <sre@...nel.org>,
        Florian Fainelli
	<florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list
	<bcm-kernel-feedback-list@...adcom.com>,
        <linux-pm@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] power: reset: brcmstb: Use
 syscon_regmap_lookup_by_phandle_args() helper

Hi,

On Jun 10, 2024 at 09:28:34 -0500, Andrew Davis wrote:
> Simplify probe by fetching the regmap and its arguments in one call.
> 
> Signed-off-by: Andrew Davis <afd@...com>
> ---
>  drivers/power/reset/brcmstb-reboot.c | 22 ++++------------------
>  1 file changed, 4 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/power/reset/brcmstb-reboot.c b/drivers/power/reset/brcmstb-reboot.c
> index db5b7120eadd0..94ea317f61ef4 100644
> --- a/drivers/power/reset/brcmstb-reboot.c
> +++ b/drivers/power/reset/brcmstb-reboot.c
> @@ -18,9 +18,6 @@
>  #include <linux/smp.h>
>  #include <linux/mfd/syscon.h>
>  
> -#define RESET_SOURCE_ENABLE_REG 1
> -#define SW_MASTER_RESET_REG 2
> -
>  static struct regmap *regmap;
>  static u32 rst_src_en;
>  static u32 sw_mstr_rst;
> @@ -87,6 +84,7 @@ static int brcmstb_reboot_probe(struct platform_device *pdev)
>  {
>  	int rc;
>  	struct device_node *np = pdev->dev.of_node;
> +	unsigned int args[2];

You can also call it syscon_args, but I'm fine either way.

>  
>  	reset_masks = device_get_match_data(&pdev->dev);
>  	if (!reset_masks) {
> @@ -94,25 +92,13 @@ static int brcmstb_reboot_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  	}
>  
> -	regmap = syscon_regmap_lookup_by_phandle(np, "syscon");
> +	regmap = syscon_regmap_lookup_by_phandle_args(np, "syscon", 2, args);
>  	if (IS_ERR(regmap)) {
>  		pr_err("failed to get syscon phandle\n");
>  		return -EINVAL;
>  	}
> -
> -	rc = of_property_read_u32_index(np, "syscon", RESET_SOURCE_ENABLE_REG,
> -					&rst_src_en);
> -	if (rc) {
> -		pr_err("can't get rst_src_en offset (%d)\n", rc);
> -		return -EINVAL;
> -	}
> -
> -	rc = of_property_read_u32_index(np, "syscon", SW_MASTER_RESET_REG,
> -					&sw_mstr_rst);
> -	if (rc) {
> -		pr_err("can't get sw_mstr_rst offset (%d)\n", rc);
> -		return -EINVAL;
> -	}
> +	rst_src_en = args[0];
> +	sw_mstr_rst = args[1];

Reviewed-by: Dhruva Gole <d-gole@...com>


-- 
Best regards,
Dhruva