linux-kernel - Re: [PATCH] arm64: dts: imx8mn-var-som-symphony: add vcc supply for PCA9534

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Date:   Mon, 6 Nov 2023 21:39:42 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Hugo Villeneuve <hugo@...ovil.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>
Cc:     Hugo Villeneuve <hvilleneuve@...onoff.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: imx8mn-var-som-symphony: add vcc supply for
 PCA9534

On 06/11/2023 19:57, Hugo Villeneuve wrote:
> From: Hugo Villeneuve <hvilleneuve@...onoff.com>
> 
> The following warning is shown when probing device:
> 
>     pca953x 1-0020: supply vcc not found, using dummy regulator
> 
> Add fixed 3.3v regulator as vcc supply to silence the warning.
> 

This is not really a warning. It's perfectly fine to use dummy
regulator. Adding such fixed supply has sense in following cases:
1. Bindings require the supply,
2. This is in fact exactly that supply (verified on schematics).

Best regards,
Krzysztof