linux-kernel - Re: [PATCH v2 1/4] spi: dt-bindings: Introduce spi-mosi-idle-low flag

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Message-ID: <ZGTmOtl8oqMdMmtY@finisterre.sirena.org.uk>
Date:   Wed, 17 May 2023 23:35:38 +0900
From:   Mark Brown <broonie@...nel.org>
To:     Börge Strümpfel <boerge.struempfel@...il.com>
Cc:     bstruempfel@...ratronik.de, andy.shevchenko@...il.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>,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/4] spi: dt-bindings: Introduce spi-mosi-idle-low flag

On Wed, May 17, 2023 at 10:26:07AM +0200, Börge Strümpfel wrote:

> However I am not so sure about setting it unconditionally, since this
> is dependent on the spi-controller. Not all spi-controller show this
> behavior, that they use a high mosi line in idle mode and have the
> ability to change this. As far as I know, another common behavior
> is that the mosi just keeps the last state which it transmitted. In this
> case, devices like Neopixel would still work without this mode bit.

The behaviour the device needs is that the device have a low MOSI, how
that is achieved is immaterial.

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