linux-kernel - Re: [PATCH v2 0/4] spi: Add option to keep the MOSI line low, when it is idle

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Message-ID: <ZF2To/SJTUQGqXer@finisterre.sirena.org.uk>
Date:   Fri, 12 May 2023 10:17:23 +0900
From:   Mark Brown <broonie@...nel.org>
To:     Boerge Struempfel <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 0/4] spi: Add option to keep the MOSI line low, when
 it is idle

On Fri, May 12, 2023 at 01:13:13AM +0200, Boerge Struempfel wrote:
> Some spi controller like the imx spi controller switch the mosi line to
> high, whenever they are idle. This may not be desired in all use cases.
> For example neopixel leds can get confused and flicker due to
> misinterpreting the idle state. Therefore, we introduce a new spi-mode
> bit, with which the idle behaviour can be overwritten on a per device
> basis.

Please don't send new patches in reply to old patches or serieses, this
makes it harder for both people and tools to understand what is going
on - it can bury things in mailboxes and make it difficult to keep track
of what current patches are, both for the new patches and the old ones.

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