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Message-ID: <20181017193812.GA11939@bogus>
Date: Wed, 17 Oct 2018 14:38:12 -0500
From: Rob Herring <robh@...nel.org>
To: Lubomir Rintel <lkundrak@...sk>
Cc: Mark Brown <broonie@...nel.org>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Darren Hart <dvhart@...radead.org>,
Andy Shevchenko <andy@...radead.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
James Cameron <quozl@...top.org>,
Sebastian Reichel <sre@...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,
platform-driver-x86@...r.kernel.org, devel@...verdev.osuosl.org,
linux-pm@...r.kernel.org
Subject: Re: [PATCH 03/15] dt-bindings: olpc,xo1.75-ec: Add OLPC XO-1.75 EC
bindings
On Wed, Oct 10, 2018 at 07:22:48PM +0200, Lubomir Rintel wrote:
> The OLPC XO-1.75 Embedded Controller is a SPI master that uses extra
> signals for handshaking. It needs to know when is the slave (Linux)
> side's TX FIFO ready for transfer (the ready-gpio signal on the SPI
> controller node) and when does it wish to respond with a command (the
> cmd-gpio property).
>
> Signed-off-by: Lubomir Rintel <lkundrak@...sk>
> ---
> .../bindings/misc/olpc,xo1.75-ec.txt | 24 +++++++++++++++++++
> 1 file changed, 24 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt
>
> diff --git a/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt b/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt
> new file mode 100644
> index 000000000000..14385fee65d2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt
> @@ -0,0 +1,24 @@
> +OLPC XO-1.75 Embedded Controller
> +
> +Required properties:
> +- compatible: Should be "olpc,xo1.75-ec".
> +- cmd-gpio: gpio specifier of the CMD pin
cmd-gpios
> +
> +The embedded controller requires the SPI controller driver to signal readiness
> +to receive a transfer (that is, when TX FIFO contains the response data) by
> +strobing the ACK pin with the ready signal. See the "ready-gpio" property of the
This will need updating based on the SPI binding.
> +SSP binding as documented in:
> +<Documentation/devicetree/bindings/spi/spi-pxa2xx.txt>.
> +
> +Example:
> + &ssp3 {
> + spi-slave;
> + status = "okay";
Don't show status in examples.
> + ready-gpio = <&gpio 125 GPIO_ACTIVE_HIGH>;
> +
> + slave {
> + compatible = "olpc,xo1.75-ec";
> + spi-cpha;
> + cmd-gpio = <&gpio 155 GPIO_ACTIVE_HIGH>;
> + };
> + };
> --
> 2.19.0
>
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