linux-kernel - Re: [PATCH] memory: stm32_omm: Use syscon_regmap_lookup_by_phandle

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Message-ID: <8f948025-a40e-417c-bbc1-a43356118ce4@foss.st.com>
Date: Mon, 26 May 2025 08:41:54 +0200
From: Patrice CHOTARD <patrice.chotard@...s.st.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Krzysztof Kozlowski
	<krzk@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre
 Torgue <alexandre.torgue@...s.st.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] memory: stm32_omm: Use
 syscon_regmap_lookup_by_phandle_args



On 5/25/25 21:13, Krzysztof Kozlowski wrote:
> Use syscon_regmap_lookup_by_phandle_args() which is a wrapper over
> syscon_regmap_lookup_by_phandle() combined with getting the syscon
> argument.  Except simpler code this annotates within one line that given
> phandle has arguments, so grepping for code would be easier.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> ---
> 
> Not tested on hardware.
> ---
>  drivers/memory/stm32_omm.c | 21 ++++++---------------
>  1 file changed, 6 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/memory/stm32_omm.c b/drivers/memory/stm32_omm.c
> index 79ceb1635698..bee2ecc8c2b9 100644
> --- a/drivers/memory/stm32_omm.c
> +++ b/drivers/memory/stm32_omm.c
> @@ -46,7 +46,7 @@ static int stm32_omm_set_amcr(struct device *dev, bool set)
>  	struct regmap *syscfg_regmap;
>  	struct device_node *node;
>  	struct resource res, res1;
> -	u32 amcr_base, amcr_mask;
> +	unsigned int syscon_args[2];
>  	int ret, idx;
>  	unsigned int i, amcr, read_amcr;
>  
> @@ -98,29 +98,20 @@ static int stm32_omm_set_amcr(struct device *dev, bool set)
>  		of_node_put(node);
>  	}
>  
> -	syscfg_regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "st,syscfg-amcr");
> +	syscfg_regmap = syscon_regmap_lookup_by_phandle_args(dev->of_node, "st,syscfg-amcr",
> +							     2, syscon_args);
>  	if (IS_ERR(syscfg_regmap))
>  		return dev_err_probe(dev, PTR_ERR(syscfg_regmap),
>  				     "Failed to get st,syscfg-amcr property\n");
>  
> -	ret = of_property_read_u32_index(dev->of_node, "st,syscfg-amcr", 1,
> -					 &amcr_base);
> -	if (ret)
> -		return ret;
> -
> -	ret = of_property_read_u32_index(dev->of_node, "st,syscfg-amcr", 2,
> -					 &amcr_mask);
> -	if (ret)
> -		return ret;
> -
>  	amcr = mm_ospi2_size / SZ_64M;
>  
>  	if (set)
> -		regmap_update_bits(syscfg_regmap, amcr_base, amcr_mask, amcr);
> +		regmap_update_bits(syscfg_regmap, syscon_args[0], syscon_args[1], amcr);
>  
>  	/* read AMCR and check coherency with memory-map areas defined in DT */
> -	regmap_read(syscfg_regmap, amcr_base, &read_amcr);
> -	read_amcr = read_amcr >> (ffs(amcr_mask) - 1);
> +	regmap_read(syscfg_regmap, syscon_args[0], &read_amcr);
> +	read_amcr = read_amcr >> (ffs(syscon_args[1]) - 1);
>  
>  	if (amcr != read_amcr) {
>  		dev_err(dev, "AMCR value not coherent with DT memory-map areas\n");

Reviewed-by: Patrice Chotard <patrice.chotard@...s.st.com>

Thanks
Patrice