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From:   Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
To:     <krzysztof.kozlowski@linaro.org>, <robh+dt@kernel.org>,
        <Nicolas.Ferre@microchip.com>, <Claudiu.Beznea@microchip.com>,
        <krzysztof.kozlowski+dt@linaro.org>
CC:     <UNGLinuxDriver@microchip.com>, <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH v5 2/3] dt-bindings: mfd: atmel,flexcom: Add new compatible string for lan966x
Date:   Mon, 20 Jun 2022 20:16:33 +0530
Message-ID: <20220620144634.25464-3-kavyasree.kotagiri@microchip.com>
In-Reply-To: <20220620144634.25464-1-kavyasree.kotagiri@microchip.com>
References: <20220620144634.25464-1-kavyasree.kotagiri@microchip.com>
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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@microchip.com>
---
v4 -> v5:
 - Fixed indentations and dt-schema errors.
 - No errors seen with 'make dt_binding_check'.

v3 -> v4:
 - Added else condition to allOf:if:then.

v2 -> v3:
 - Add reg property of lan966x missed in v2.

v1 -> v2:
 - Use allOf:if:then for lan966x dt properties

 .../bindings/mfd/atmel,flexcom.yaml           | 78 ++++++++++++++++++-
 1 file changed, 77 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml b/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
index fc5af946b568..216d08b44bb3 100644
--- a/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
+++ b/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
@@ -18,9 +18,11 @@ properties:
   compatible:
     enum:
       - atmel,sama5d2-flexcom
+      - microchip,lan966x-flexcom
 
   reg:
-    maxItems: 1
+    minItems: 1
+    maxItems: 2
 
   clocks:
     maxItems: 1
@@ -47,6 +49,27 @@ 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.
@@ -73,6 +96,31 @@ required:
   - ranges
   - atmel,flexcom-mode
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: microchip,lan966x-flexcom
+
+    then:
+      properties:
+        reg:
+          items:
+            - description: Flexcom base registers map
+            - description: Flexcom shared registers map
+      required:
+        - microchip,flx-shrd-pins
+        - microchip,flx-cs
+
+    else:
+      properties:
+        reg:
+          items:
+            - description: Flexcom base registers map
+        microchip,flx-shrd-pins: false
+        microchip,flx-cs: false
+
 additionalProperties: false
 
 examples:
@@ -101,4 +149,32 @@ examples:
             atmel,fifo-size = <32>;
         };
     };
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    flx3: flexcom@e0064000 {
+        compatible = "microchip,lan966x-flexcom";
+        reg = <0xe0064000 0x100>,
+              <0xe2004180 0x8>;
+        clocks = <&flx0_clk>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0x0 0xe0040000 0x800>;
+        atmel,flexcom-mode = <2>;
+        microchip,flx-shrd-pins = <9>;
+        microchip,flx-cs = <0>;
+
+        spi3: spi@400 {
+            compatible = "atmel,at91rm9200-spi";
+            reg = <0x400 0x200>;
+            interrupts = <GIC_SPI 51 IRQ_TYPE_LEVEL_HIGH>;
+            pinctrl-names = "default";
+            pinctrl-0 = <&pinctrl_flx3_default>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+            clocks = <&nic_clk>;
+            clock-names = "spi_clk";
+            atmel,fifo-size = <32>;
+        };
+    };
 ...
-- 
2.17.1