linux-kernel - Re: [PATCH 09/11] dt-bindings: spi/spi-pxa2xx: Add ready GPIO signal

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Message-ID: <20181104121314.GU23864@amd>
Date:   Sun, 4 Nov 2018 13:13:14 +0100
From:   Pavel Machek <pavel@....cz>
To:     Lubomir Rintel <lkundrak@...sk>
Cc:     Mark Brown <broonie@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        James Cameron <quozl@...top.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Eric Miao <eric.y.miao@...il.com>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Daniel Mack <daniel@...que.org>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 09/11] dt-bindings: spi/spi-pxa2xx: Add ready GPIO signal

On Wed 2018-10-10 19:09:34, Lubomir Rintel wrote:
> This this is used to let the SPI master know that our FIFO is filled and
> we're ready to service a transfer. Only useful in slave mode.
> 
> A signal like this is used by an embedded controller on a OLPC XO 1.75
> machine, that happens to be a SPI master.
> 
> Signed-off-by: Lubomir Rintel <lkundrak@...sk>

Acked-by: Pavel Machek <pavel@....cz>

> ---
>  Documentation/devicetree/bindings/spi/spi-pxa2xx.txt | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/spi/spi-pxa2xx.txt b/Documentation/devicetree/bindings/spi/spi-pxa2xx.txt
> index 89b2832283e3..681a82b40e6f 100644
> --- a/Documentation/devicetree/bindings/spi/spi-pxa2xx.txt
> +++ b/Documentation/devicetree/bindings/spi/spi-pxa2xx.txt
> @@ -12,6 +12,8 @@ Optional properties:
>  - cs-gpios: list of GPIO chip selects. See the SPI bus bindings,
>    Documentation/devicetree/bindings/spi/spi-bus.txt
>  - spi-slave: Empty property indicating the SPI controller is used in slave mode.
> +- ready-gpio: GPIO used to signal a SPI master that the FIFO is filled
> +  and we're ready to service a transfer. Only useful in slave mode.
>  
>  Child nodes represent devices on the SPI bus
>    See ../spi/spi-bus.txt

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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