linux-kernel - Re: [PATCH 2/2] ARM: dts: imx6qdl: tqma6: minor fixes

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Date:   Thu, 27 Aug 2020 18:27:07 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Matthias Schiffer <matthias.schiffer@...tq-group.com>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ARM: dts: imx6qdl: tqma6: minor fixes

Hi Matthias,

(Your mailer is messing the threading.)

On Thu, Aug 27, 2020 at 4:31 AM Matthias Schiffer
<matthias.schiffer@...tq-group.com> wrote:

> Ah, I see.
>
> Nevertheless, hardware that uses the native chipselects of newer chips
> exists (for example our TQ-Systems starterkit mainboards, the DTS of
> which we're currently preparing for mainline submission). Shouldn't
> num-cs be set for boards (or SoM DTSI) where not all CS pins of the SoC
> are usable?
>
> In any case, my original question was about the intended logic for
> num_chipselects for SPI drivers. My proposal was:
>
> - If num-cs is set, use that
> - If num-cs is unset, use the number of cs-gpios
> - If num-cs is unset and no cs-gpios are defined, use a driver-provided
> default
>
> How do other SPI controller drivers deal with this?

I think it would be better to discuss this in the spi mailing list
with Mark Brown and the dt maintainer, Rob Herring.