linux-kernel - Re: [BUG] SPI broken for SPI based panel drivers

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Message-ID: <CAGngYiVF5yMAGPJ8xZgt=BfJ3JfBMABVC0t+dQ2oOq986T9iKg@mail.gmail.com>
Date:   Tue, 1 Dec 2020 11:53:58 -0500
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>,
        Andreas Kemnade <andreas@...nade.info>
Subject: Re: [BUG] SPI broken for SPI based panel drivers

Hi Nikolaus,

On Tue, Dec 1, 2020 at 11:43 AM H. Nikolaus Schaller <hns@...delico.com> wrote:
>
> You are right. It is active low.
>

In that case, we have a very simple solution, just remove the spi-cs-high,
and things will work.

In case of SPI CS gpios, the current kernel ignores all
GPIO_ACTIVE_HIGH/LOW
flags, and uses the presence/absence of spi-cs-high instead, to
determine active high / active low.