Re: [PATCH] dt-bindings: spi: dw-apb-ssi: Integrate Renesas RZ/N1 SPI controller

On Thu, 06 May 2021 13:52:59 +0200, Geert Uytterhoeven wrote:

Originally, the Renesas RZ/N1 SPI Controller DT bindings were not
integrated in the main DT bindings for the Synopsys DesignWare
Synchronous Serial Interface, but in its own file, as the RZ/N1
controller has additional registers for software CS control and DMA.

As so far DMA is not supported on RZ/N1, and json-schema can handle any
possible differences fine, integrate the RZ/N1 compatible values in the
main DT bindings for the Synopsys DW SSI.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
There are no upstream users of this binding, but it validates the
following (modified) example taken from the RZ/N1 BSP[1] fine:

    spi0: spi@50005000 {
	    compatible = "renesas,r9a06g032-spi", "renesas,rzn1-spi";
	    reg = <0x50005000 0x400>;
	    interrupts = <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>;
	    clock-names = "ssi_clk", "pclk";
	    clocks = <&sysctrl R9A06G032_CLK_SPI0>, <&sysctrl R9A06G032_HCLK_SPI0>;
	    #address-cells = <1>;
	    #size-cells = <0>;
	    spi-max-frequency = <12500000>;
	    num-cs = <4>;
    };

[1] https://github.com/renesas-rz/rzn1_linux/blob/rzn1-stable-v4.19/arch/arm/boot/dts/rzn1.dtsi
---
 .../devicetree/bindings/spi/renesas,rzn1-spi.txt      | 11 -----------
 .../devicetree/bindings/spi/snps,dw-apb-ssi.yaml      |  6 ++++++
 2 files changed, 6 insertions(+), 11 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/spi/renesas,rzn1-spi.txt

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