linux-kernel - [PATCH v2 2/3] dt-bindings: mfd: atmel,flexcom: Add new compatible string for lan966x

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Message-ID: <20220607144740.14937-3-kavyasree.kotagiri@microchip.com>
Date:   Tue, 7 Jun 2022 20:17:39 +0530
From:   Kavyasree Kotagiri <kavyasree.kotagiri@...rochip.com>
To:     <krzysztof.kozlowski+dt@...aro.org>, <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <claudiu.beznea@...rochip.com>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kavyasree.kotagiri@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>
Subject: [PATCH v2 2/3] dt-bindings: mfd: atmel,flexcom: Add new compatible string for lan966x

LAN966x SoC flexcoms has two optional I/O lines. Namely, CS0 and CS1
in flexcom SPI mode. CTS and RTS in flexcom USART mode. These pins
can be mapped to lan966x FLEXCOM_SHARED[0-20] pins and usage depends on
functions being configured.

Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@...rochip.com>
---
v1 -> v2:
 - Use allOf:if:then for lan966x dt properties

 .../bindings/mfd/atmel,flexcom.yaml           | 39 ++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml b/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
index 05cb6ebb4b2a..2d357217fe22 100644
--- a/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
+++ b/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
@@ -16,7 +16,9 @@ description:
 
 properties:
   compatible:
-    const: atmel,sama5d2-flexcom
+    enum:
+      - atmel,sama5d2-flexcom
+      - microchip,lan966x-flexcom
 
   reg:
     maxItems: 1
@@ -46,6 +48,27 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [1, 2, 3]
 
+  microchip,flx-shrd-pins:
+    description: Specify the Flexcom shared pins to be used for flexcom
+      chip-selects.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 1
+    maxItems: 2
+    items:
+      minimum: 0
+      maximum: 20
+
+  microchip,flx-cs:
+    description: Flexcom chip selects. Here, value of '0' represents "cts" line
+      of flexcom USART or "cs0" line of flexcom SPI and value of '1' represents
+      "rts" line of flexcom USART or "cs1" line of flexcom SPI.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 1
+    maxItems: 2
+    items:
+      minimum: 0
+      maximum: 1
+
 patternProperties:
   "^serial@[0-9a-f]+$":
     description: See atmel-usart.txt for details of USART bindings.
@@ -68,6 +91,18 @@ required:
   - ranges
   - atmel,flexcom-mode
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: microchip,lan966x-flexcom
+
+    then:
+      required:
+        - microchip,flx-shrd-pins
+        - microchip,flx-cs
+
 additionalProperties: false
 
 examples:
@@ -80,6 +115,8 @@ examples:
           #size-cells = <1>;
           ranges = <0x0 0xf8034000 0x800>;
           atmel,flexcom-mode = <2>;
+          microchip,flx-shrd-pins = <9>;
+          microchip,flx-cs = <0>;
 
           spi0: spi@400 {
                 compatible = "atmel,at91rm9200-spi";
-- 
2.17.1