linux-kernel - Re: [PATCH] arm64: dts: imx8mn-var-som-symphony: adapt FEC pinctrl for SOMs with onboard PHY

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Date:   Sun, 4 Jun 2023 20:51:18 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Hugo Villeneuve <hugo@...ovil.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...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>,
        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: adapt FEC pinctrl
 for SOMs with onboard PHY

On Mon, May 29, 2023 at 03:35:26PM -0400, Hugo Villeneuve wrote:
> From: Hugo Villeneuve <hvilleneuve@...onoff.com>
> 
> The VAR SOM symphony carrier board can be used with SOMs which have a
> soldered ethernet PHY onboard and with SOMs which don't have one.
> 
> For SOMs with an onboard PHY, the PHY on the cartrier board is not
> used, and GPIO1_IO9 is used as a reset line to the onboard PHY.
> 
> For SOMs without an onboard PHY, the PHY on the carrier board is
> used. For this configuration, pca9534 GPIO 5 (located on the carrier
> board) is used as a reset line to the PHY, and GPIO1_IO9 is not
> used.
> 
> GPIO1_IO9 is not connected to any user-accessible pins or functions,
> and leaving it enabled in the mux pinctrl for both configurations is
> safe.
> 
> Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>

Applied, thanks!