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@xxxxxxxxx>
> ---
> 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@xxxxxxxxxx>
