linux-kernel - Re: [PATCH v3 04/15] spi: dt-bindings: dw-apb-ssi: update spi-{r,t}x-bus-width

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Date:   Thu, 30 Jun 2022 10:57:17 -0600
From:   Rob Herring <robh@...nel.org>
To:     Conor Dooley <mail@...chuod.ie>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Palmer Dabbelt <palmer@...belt.com>, dmaengine@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        alsa-devel@...a-project.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-kernel@...r.kernel.org, Jose Abreu <joabreu@...opsys.com>,
        devicetree@...r.kernel.org, Serge Semin <fancer.lancer@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Vinod Koul <vkoul@...nel.org>,
        Dillon Min <dillon.minfei@...il.com>,
        linux-riscv@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Mark Brown <broonie@...nel.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Palmer Dabbelt <palmer@...osinc.com>,
        Niklas Cassel <niklas.cassel@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        linux-spi@...r.kernel.org
Subject: Re: [PATCH v3 04/15] spi: dt-bindings: dw-apb-ssi: update
 spi-{r,t}x-bus-width

On Wed, 29 Jun 2022 19:43:33 +0100, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
> 
> Most users of dw-apb-ssi use spi-{r,t}x-bus-width of 1, however the
> Canaan k210 is wired up for a width of 4.
> Quoting Serge:
> The modern DW APB SSI controllers of v.4.* and newer also support the
> enhanced SPI Modes too (Dual, Quad and Octal). Since the IP-core
> version is auto-detected at run-time there is no way to create a
> DT-schema correctly constraining the Rx/Tx SPI bus widths.
> /endquote
> 
> As such, drop the restriction on only supporting a bus width of 1.
> 
> Link: https://lore.kernel.org/all/20220620205654.g7fyipwytbww5757@mobilestation/
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml | 6 ------
>  1 file changed, 6 deletions(-)
> 

Reviewed-by: Rob Herring <robh@...nel.org>