From 4056d88866e5941ebd15fb2523119f0ddc5186da Mon Sep 17 00:00:00 2001 From: Fabrizio Castro Date: Wed, 27 Sep 2023 17:25:07 +0100 Subject: spi: renesas,rzv2m-csi: Add CSI (SPI) target related property The CSI IP found inside the Renesas RZ/V2M SoC can also work in SPI target mode. When working in target mode, the IP will make use of the SS (Slave Selection) pin, with "low" as default active level. The active level of SS can be changed to "high" upon setting property "spi-cs-high" to true. By default, the SS will be used in target mode, unless property "renesas,csi-no-ss" is set to true, in which case data will be shifted in and out purely based on clock activity, and the logic level of the SS pin will be completely ignored. Signed-off-by: Fabrizio Castro Reviewed-by: Rob Herring Link: https://lore.kernel.org/r/20230927162508.328736-2-fabrizio.castro.jz@renesas.com Signed-off-by: Mark Brown --- Documentation/devicetree/bindings/spi/renesas,rzv2m-csi.yaml | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'Documentation/devicetree/bindings/spi') diff --git a/Documentation/devicetree/bindings/spi/renesas,rzv2m-csi.yaml b/Documentation/devicetree/bindings/spi/renesas,rzv2m-csi.yaml index e59183e53690..bed829837df1 100644 --- a/Documentation/devicetree/bindings/spi/renesas,rzv2m-csi.yaml +++ b/Documentation/devicetree/bindings/spi/renesas,rzv2m-csi.yaml @@ -39,6 +39,12 @@ properties: power-domains: maxItems: 1 + renesas,csi-no-ss: + type: boolean + description: + The CSI Slave Selection (SS) pin won't be used to enable transmission and + reception. Only available when in target mode. + required: - compatible - reg @@ -50,6 +56,9 @@ required: - '#address-cells' - '#size-cells' +dependencies: + renesas,csi-no-ss: [ spi-slave ] + unevaluatedProperties: false examples: -- cgit v1.2.3