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| author | Fabrizio Castro <fabrizio.castro.jz@renesas.com> | 2023-09-27 19:25:07 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2023-10-09 15:14:27 +0300 |
| commit | 4056d88866e5941ebd15fb2523119f0ddc5186da (patch) | |
| tree | be79629fe42b378f36fcf5482de74b284c68ecde /Documentation/devicetree/bindings/spi | |
| parent | df22568ad8ed317db95acc11e1c08bae7a0fba5d (diff) | |
| download | linux-4056d88866e5941ebd15fb2523119f0ddc5186da.tar.xz | |
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 <fabrizio.castro.jz@renesas.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230927162508.328736-2-fabrizio.castro.jz@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'Documentation/devicetree/bindings/spi')
| -rw-r--r-- | Documentation/devicetree/bindings/spi/renesas,rzv2m-csi.yaml | 9 |
1 files changed, 9 insertions, 0 deletions
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: |