| Message ID | 20230927162508.328736-2-fabrizio.castro.jz@renesas.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Geert Uytterhoeven |
| Headers | show |
| Series | Add RZ/V2M CSI slave support | expand |
On Wed, 27 Sep 2023 17:25:07 +0100, Fabrizio Castro wrote: > 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 <fabrizio.castro.jz@renesas.com> > --- > v1->v2: I have dropped properties renesas,csi-ss and > renesas,csi-ss-high. I have added property > renesas,csi-no-ss, and to configure SS as active > high one now needs to use property spi-cs-high. > I have also reworded the changelog to use a more > modern terminology (host and target as opposed to > master and slave). > > .../devicetree/bindings/spi/renesas,rzv2m-csi.yaml | 9 +++++++++ > 1 file changed, 9 insertions(+) > Reviewed-by: Rob Herring <robh@kernel.org>
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:
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 <fabrizio.castro.jz@renesas.com> --- v1->v2: I have dropped properties renesas,csi-ss and renesas,csi-ss-high. I have added property renesas,csi-no-ss, and to configure SS as active high one now needs to use property spi-cs-high. I have also reworded the changelog to use a more modern terminology (host and target as opposed to master and slave). .../devicetree/bindings/spi/renesas,rzv2m-csi.yaml | 9 +++++++++ 1 file changed, 9 insertions(+)