linux-kernel - Re: [PATCH 04/11] dt-bindings: spi: Move and adjust the bindings for the fsl-qspi driver

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Date:   Wed, 30 May 2018 17:06:48 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Frieder Schrempf <frieder.schrempf@...eet.de>
Cc:     linux-mtd@...ts.infradead.org, linux-spi@...r.kernel.org,
        dwmw2@...radead.org, computersforpeace@...il.com,
        marek.vasut@...il.com, richard@....at, miquel.raynal@...tlin.com,
        broonie@...nel.org, david.wolfe@....com, fabio.estevam@....com,
        prabhakar.kushwaha@....com, yogeshnarayan.gaur@....com,
        han.xu@....com, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/11] dt-bindings: spi: Move and adjust the bindings
 for the fsl-qspi driver

On Wed, 30 May 2018 15:14:33 +0200
Frieder Schrempf <frieder.schrempf@...eet.de> wrote:

> Move the documentation of the old SPI NOR driver to the place of the new
> SPI memory interface based driver and adjust the content to reflect the
> new drivers settings.

Maybe it's better to do that in 2 steps so that people can easily
identify what has changed in the bindings.

> 
> Signed-off-by: Frieder Schrempf <frieder.schrempf@...eet.de>
> ---
>  .../devicetree/bindings/mtd/fsl-quadspi.txt     | 65 ------------------
>  .../devicetree/bindings/spi/spi-fsl-qspi.txt    | 69 ++++++++++++++++++++
>  2 files changed, 69 insertions(+), 65 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mtd/fsl-quadspi.txt b/Documentation/devicetree/bindings/mtd/fsl-quadspi.txt
> deleted file mode 100644
> index 483e9cf..0000000
> --- a/Documentation/devicetree/bindings/mtd/fsl-quadspi.txt
> +++ /dev/null
> @@ -1,65 +0,0 @@
> -* Freescale Quad Serial Peripheral Interface(QuadSPI)
> -
> -Required properties:
> -  - compatible : Should be "fsl,vf610-qspi", "fsl,imx6sx-qspi",
> -		 "fsl,imx7d-qspi", "fsl,imx6ul-qspi",
> -		 "fsl,ls1021a-qspi"
> -		 or
> -		 "fsl,ls2080a-qspi" followed by "fsl,ls1021a-qspi",
> -		 "fsl,ls1043a-qspi" followed by "fsl,ls1021a-qspi"
> -  - reg : the first contains the register location and length,
> -          the second contains the memory mapping address and length
> -  - reg-names: Should contain the reg names "QuadSPI" and "QuadSPI-memory"
> -  - interrupts : Should contain the interrupt for the device
> -  - clocks : The clocks needed by the QuadSPI controller
> -  - clock-names : Should contain the name of the clocks: "qspi_en" and "qspi".
> -
> -Optional properties:
> -  - fsl,qspi-has-second-chip: The controller has two buses, bus A and bus B.
> -                              Each bus can be connected with two NOR flashes.
> -			      Most of the time, each bus only has one NOR flash
> -			      connected, this is the default case.
> -			      But if there are two NOR flashes connected to the
> -			      bus, you should enable this property.
> -			      (Please check the board's schematic.)
> -  - big-endian : That means the IP register is big endian
> -
> -Example:
> -
> -qspi0: quadspi@...44000 {
> -	compatible = "fsl,vf610-qspi";
> -	reg = <0x40044000 0x1000>, <0x20000000 0x10000000>;
> -	reg-names = "QuadSPI", "QuadSPI-memory";
> -	interrupts = <0 24 IRQ_TYPE_LEVEL_HIGH>;
> -	clocks = <&clks VF610_CLK_QSPI0_EN>,
> -		<&clks VF610_CLK_QSPI0>;
> -	clock-names = "qspi_en", "qspi";
> -
> -	flash0: s25fl128s@0 {
> -		....
> -	};
> -};
> -
> -Example showing the usage of two SPI NOR devices:
> -
> -&qspi2 {
> -	pinctrl-names = "default";
> -	pinctrl-0 = <&pinctrl_qspi2>;
> -	status = "okay";
> -
> -	flash0: n25q256a@0 {
> -		#address-cells = <1>;
> -		#size-cells = <1>;
> -		compatible = "micron,n25q256a", "jedec,spi-nor";
> -		spi-max-frequency = <29000000>;
> -		reg = <0>;
> -	};
> -
> -	flash1: n25q256a@1 {
> -		#address-cells = <1>;
> -		#size-cells = <1>;
> -		compatible = "micron,n25q256a", "jedec,spi-nor";
> -		spi-max-frequency = <29000000>;
> -		reg = <1>;
> -	};
> -};
> diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt
> new file mode 100644
> index 0000000..0ee9cd8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt
> @@ -0,0 +1,69 @@
> +* Freescale Quad Serial Peripheral Interface(QuadSPI)
> +
> +Required properties:
> +  - compatible : Should be "fsl,vf610-qspi", "fsl,imx6sx-qspi",
> +		 "fsl,imx7d-qspi", "fsl,imx6ul-qspi",
> +		 "fsl,ls1021a-qspi", "fsl,ls2080a-qspi"
> +		 or
> +		 "fsl,ls1043a-qspi" followed by "fsl,ls1021a-qspi"
> +  - reg : the first contains the register location and length,
> +          the second contains the memory mapping address and length
> +  - reg-names: Should contain the reg names "QuadSPI" and "QuadSPI-memory"
> +  - interrupts : Should contain the interrupt for the device
> +  - clocks : The clocks needed by the QuadSPI controller
> +  - clock-names : Should contain the name of the clocks: "qspi_en" and "qspi".
> +
> +Optional properties:
> +  - big-endian : That means the IP registers format is big endian
> +
> +Required SPI slave node properties:
> +  - reg: There are two buses (A and B) with two chip selects each.
> +	 This encodes to which bus and CS the flash is connected:
> +		<0>: Bus A, CS 0
> +		<1>: Bus A, CS 1
> +		<2>: Bus B, CS 0
> +		<3>: Bus B, CS 1
> +
> +Example:
> +
> +qspi0: quadspi@...44000 {
> +	compatible = "fsl,vf610-qspi";
> +	reg = <0x40044000 0x1000>, <0x20000000 0x10000000>;
> +	reg-names = "QuadSPI", "QuadSPI-memory";
> +	interrupts = <0 24 IRQ_TYPE_LEVEL_HIGH>;
> +	clocks = <&clks VF610_CLK_QSPI0_EN>,
> +		<&clks VF610_CLK_QSPI0>;
> +	clock-names = "qspi_en", "qspi";
> +
> +	flash0: s25fl128s@0 {
> +		....
> +	};
> +};
> +
> +Example showing the usage of two SPI NOR devices on bus A:
> +
> +&qspi2 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_qspi2>;
> +	status = "okay";
> +
> +	flash0: n25q256a@0 {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		compatible = "micron,n25q256a", "jedec,spi-nor";
> +		spi-max-frequency = <29000000>;
> +		spi-rx-bus-width = <4>;
> +		spi-tx-bus-width = <4>;
> +		reg = <0>;
> +	};
> +
> +	flash1: n25q256a@1 {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		compatible = "micron,n25q256a", "jedec,spi-nor";
> +		spi-max-frequency = <29000000>;
> +		spi-rx-bus-width = <4>;
> +		spi-tx-bus-width = <4>;
> +		reg = <1>;
> +	};
> +};