dt-bindings: spi: dw-apb-ssi: Integrate Renesas RZ/N1 SPI controller

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

On Thu, 6 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.

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/1] dt-bindings: spi: dw-apb-ssi: Integrate Renesas RZ/N1 SPI controller
      commit: 029d32a892a860017d33ff8d9598259731e776ad

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark