1 files changed, 52 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/spi/spi-controller.yaml b/Documentation/devicetree/bindings/spi/spi-controller.yaml
index 524f6fe8c27b..82d051f7bd6e 100644
--- a/Documentation/devicetree/bindings/spi/spi-controller.yaml
+++ b/Documentation/devicetree/bindings/spi/spi-controller.yaml
@@ -69,6 +69,26 @@ properties:
          Should be generally avoided and be replaced by
          spi-cs-high + ACTIVE_HIGH.
 
+      The simplest way to obtain an active-high CS signal is to configure the
+      controller's cs-gpio property with the ACTIVE_HIGH flag and set the
+      peripheral's spi-cs-high property. See example below for a better
+      understanding.
+
+  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 +136,10 @@ patternProperties:
       - compatible
       - reg
 
+dependencies:
+  rx-fifo-depth: [ tx-fifo-depth ]
+  tx-fifo-depth: [ rx-fifo-depth ]
+
 allOf:
   - if:
       not:
@@ -129,6 +153,14 @@ allOf:
       properties:
         "#address-cells":
           const: 0
+  - not:
+      required:
+        - fifo-depth
+        - rx-fifo-depth
+  - not:
+      required:
+        - fifo-depth
+        - tx-fifo-depth
 
 additionalProperties: true
 
@@ -162,3 +194,23 @@ examples:
             stacked-memories = /bits/ 64 <0x10000000 0x10000000>;
         };
     };
+
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi@20204000 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        compatible = "brcm,bcm2835-spi";
+        reg = <0x7e204000 0x1000>;
+        interrupts = <2 22>;
+        clocks = <&clk_spi>;
+        cs-gpios = <&gpio 8 GPIO_ACTIVE_HIGH>;
+
+        display@0 {
+            compatible = "lg,lg4573";
+            spi-max-frequency = <1000000>;
+            reg = <0>;
+            spi-cs-high;
+        };
+    };