linux-kernel - Re: [PATCH v3 1/2] dt-bindings: spi: Qualcomm Quad SPI(QSPI) documentation

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Date:   Thu, 27 Sep 2018 15:46:24 -0500
From:   Rob Herring <robh@...nel.org>
To:     Ryan Case <ryandcase@...omium.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-arm-msm@...r.kernel.org,
        Doug Anderson <dianders@...omium.org>,
        Trent Piepho <tpiepho@...inj.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Girish Mahadevan <girishm@...eaurora.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org, Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v3 1/2] dt-bindings: spi: Qualcomm Quad SPI(QSPI)
 documentation

On Wed, Sep 26, 2018 at 01:52:03PM -0700, Ryan Case wrote:
> From: Girish Mahadevan <girishm@...eaurora.org>
> 
> Bindings for Qualcomm Quad SPI used on SoCs such as sdm845.
> 
> Signed-off-by: Girish Mahadevan <girishm@...eaurora.org>
> Signed-off-by: Ryan Case <ryandcase@...omium.org>
> ---
> 
> Changes in v3:
> - Added generic compatible string in addition to specific SoC
> 
> Changes in v2:
> - Added commit text
> - Removed invalid property
> - Updated example to match sdm845 with attached spi-nor
> 
>  .../bindings/spi/qcom,spi-qcom-qspi.txt       | 36 +++++++++++++++++++
>  1 file changed, 36 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt
> 
> diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt b/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt
> new file mode 100644
> index 000000000000..e13f5bb314ad
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt
> @@ -0,0 +1,36 @@
> +Qualcomm Quad Serial Peripheral Interface (QSPI)
> +
> +The QSPI controller allows SPI protocol communication in single, dual, or quad
> +wire transmission modes for read/write access to slaves such as NOR flash.
> +
> +Required properties:
> +- compatible:	An SoC specific identifier followed by "qcom,qspi-v1", such as
> +		"qcom,sdm845-qspi", "qcom,qspi-v1"
> +- reg:		Should contain the base register location and length.
> +- interrupts:	Interrupt number used by the controller.
> +- clocks:	Should contain the core and AHB clock.
> +- clock-names:	Should be "core" for core clock and "iface" for AHB clock.
> +
> +SPI slave nodes must be children of the SPI master node and can contain
> +properties described in Documentation/devicetree/bindings/spi/spi-bus.txt
> +
> +Example:
> +
> +	qspi: qspi@...f000 {

spi@...

> +		compatible = "qcom,sdm845-qspi", "qcom,qspi-v1";
> +		reg = <0x88df000 0x600>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>;
> +		clock-names = "iface", "core";
> +		clocks = <&gcc GCC_QSPI_CNOC_PERIPH_AHB_CLK>,
> +			 <&gcc GCC_QSPI_CORE_CLK>;
> +
> +		device@0 {

flash@0

With that,

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

> +			compatible = "jedec,spi-nor";
> +			reg = <0>;
> +			spi-max-frequency = <25000000>;
> +			spi-tx-bus-width = <2>;
> +			spi-rx-bus-width = <2>;
> +		};
> +	};
> -- 
> 2.19.0.605.g01d371f741-goog
>