From 80a38bfbbd5965c8bda73b20aa78d308739bbc31 Mon Sep 17 00:00:00 2001 From: Tudor Ambarus Date: Fri, 16 Feb 2024 07:05:44 +0000 Subject: spi: dt-bindings: introduce FIFO depth properties There are SPI IPs that can be configured by the integrator with a specific FIFO depth depending on the system's capabilities. For example, the samsung USI SPI IP can be configured by the integrator with a TX/RX FIFO from 8 byte to 256 bytes. Introduce the ``fifo-depth`` property for such instances of IPs where the same FIFO depth is used for both RX and TX. Introduce ``rx-fifo-depth`` and ``tx-fifo-depth`` properties for cases where the RX FIFO depth is different from the TX FIFO depth. Make the dedicated RX/TX properties dependent on each other and mutual exclusive with the other. Reviewed-by: Rob Herring Signed-off-by: Tudor Ambarus Reviewed-by: Conor Dooley Link: https://msgid.link/r/20240216070555.2483977-2-tudor.ambarus@linaro.org Signed-off-by: Mark Brown --- .../devicetree/bindings/spi/spi-controller.yaml | 27 ++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'Documentation/devicetree/bindings/spi') diff --git a/Documentation/devicetree/bindings/spi/spi-controller.yaml b/Documentation/devicetree/bindings/spi/spi-controller.yaml index 524f6fe8c27b..093150c0cb87 100644 --- a/Documentation/devicetree/bindings/spi/spi-controller.yaml +++ b/Documentation/devicetree/bindings/spi/spi-controller.yaml @@ -69,6 +69,21 @@ properties: Should be generally avoided and be replaced by spi-cs-high + ACTIVE_HIGH. + fifo-depth: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Size of the RX and TX data FIFOs in bytes. + + rx-fifo-depth: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Size of the RX data FIFO in bytes. + + tx-fifo-depth: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Size of the TX data FIFO in bytes. + num-cs: $ref: /schemas/types.yaml#/definitions/uint32 description: @@ -116,6 +131,10 @@ patternProperties: - compatible - reg +dependencies: + rx-fifo-depth: [ tx-fifo-depth ] + tx-fifo-depth: [ rx-fifo-depth ] + allOf: - if: not: @@ -129,6 +148,14 @@ allOf: properties: "#address-cells": const: 0 + - not: + required: + - fifo-depth + - rx-fifo-depth + - not: + required: + - fifo-depth + - tx-fifo-depth additionalProperties: true -- cgit v1.2.3