linux-kernel - Re: [PATCH 2/2] net: stmmac: dwmac-rk: Validate rockchip,grf and php-grf during probe

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Message-ID: <bab793bb-1cbe-4df6-ba6b-7ac8bfef989d@lunn.ch>
Date: Thu, 6 Mar 2025 23:37:27 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Jonas Karlman <jonas@...boo.se>
Cc: Heiko Stuebner <heiko@...ech.de>, Andrew Lunn <andrew+netdev@...n.ch>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH 2/2] net: stmmac: dwmac-rk: Validate rockchip,grf and
 php-grf during probe

On Thu, Mar 06, 2025 at 09:09:46PM +0000, Jonas Karlman wrote:
> All Rockchip GMAC variants require writing to GRF to configure e.g.
> interface mode and MAC rx/tx delay. The GRF syscon regmap is located
> with help of a rockchip,grf and rockchip,php-grf phandle.

> @@ -1813,8 +1564,24 @@ static struct rk_priv_data *rk_gmac_setup(struct platform_device *pdev,
>  
>  	bsp_priv->grf = syscon_regmap_lookup_by_phandle(dev->of_node,
>  							"rockchip,grf");
> -	bsp_priv->php_grf = syscon_regmap_lookup_by_phandle(dev->of_node,
> -							    "rockchip,php-grf");
> +	if (IS_ERR(bsp_priv->grf)) {
> +		ret = PTR_ERR(bsp_priv->grf);
> +		dev_err_probe(dev, ret, "failed to lookup rockchip,grf\n");
> +		return ERR_PTR(ret);
> +	}
> +
> +	bsp_priv->php_grf =
> +		syscon_regmap_lookup_by_phandle_optional(dev->of_node,
> +							 "rockchip,php-grf");
> +	if ((of_device_is_compatible(dev->of_node, "rockchip,rk3588-gmac") ||
> +	     of_device_is_compatible(dev->of_node, "rockchip,rk3576-gmac")) &&
> +	    !bsp_priv->php_grf)
> +		bsp_priv->php_grf = ERR_PTR(-ENODEV);

It seems odd you say all variants need this property, and then you
look for two specific variants here and do something different? Why
are these two special?

	Andrew