linux-kernel - Re: [PATCH v3 2/2] spi: cadence: add support for Cadence XSPI controller

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Message-ID: <20210903112403.GF4932@sirena.org.uk>
Date:   Fri, 3 Sep 2021 12:24:03 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Parshuram Raju Thombare <pthombar@...ence.com>
Cc:     "lukas@...ner.de" <lukas@...ner.de>,
        "p.yadav@...com" <p.yadav@...com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jayshri Dajiram Pawar <jpawar@...ence.com>,
        Milind Parab <mparab@...ence.com>,
        Konrad Kociolek <konrad@...ence.com>
Subject: Re: [PATCH v3 2/2] spi: cadence: add support for Cadence XSPI
 controller

On Fri, Sep 03, 2021 at 10:47:50AM +0000, Parshuram Raju Thombare wrote:

> Oh, ok.  That is done at power on reset by the controller in 2 ways.
> 1. Using device discovery module, controller try to auto detect the valid protocol
>     mode by trying to read SFDP signature in various modes.
> 2. Particular protocol mode can be selected using bootstrap signals.

> I think mode_bits need to include protocol mode which is auto detected or
> set using bootstrap signals. I will make that change in next version. 

Yes, that sounds better.  I guess at least in the case of autodetection
the mode can be overridden by software later, but that can always be
added later if someone actually needs the feature.

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