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From: Tudor Ambarus <tudor.ambarus@linaro.org>
To: broonie@kernel.org,
	robh@kernel.org,
	andi.shyti@kernel.org,
	krzysztof.kozlowski@linaro.org,
	semen.protsenko@linaro.org,
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Cc: alim.akhtar@samsung.com,
	linux-spi@vger.kernel.org,
	linux-samsung-soc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
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	andre.draszik@linaro.org,
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	Tudor Ambarus <tudor.ambarus@linaro.org>
Subject: [PATCH v2 01/12] spi: dt-bindings: introduce FIFO depth properties
Date: Mon, 12 Feb 2024 14:03:20 +0000
Message-ID: <20240212140331.915498-2-tudor.ambarus@linaro.org>
In-Reply-To: <20240212140331.915498-1-tudor.ambarus@linaro.org>
References: <20240212140331.915498-1-tudor.ambarus@linaro.org>
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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.

Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
---
 .../bindings/spi/spi-controller.yaml          | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/spi-controller.yaml b/Documentation/devicetree/bindings/spi/spi-controller.yaml
index 524f6fe8c27b..add39884d226 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
 
-- 
2.43.0.687.g38aa6559b0-goog