[PATCH v3 1/2] gpio: dt-bindings: add parsing of loongson gpio offset

[Yinbo Zhu <zhuyinbo@xxxxxxxxxxx>]

Loongson GPIO controllers come in multiple variants that are compatible
except for certain register offset values. Add support in yaml file for
device properties allowing to specify them in DT.

Signed-off-by: Yinbo Zhu <zhuyinbo@xxxxxxxxxxx>
---
 .../bindings/gpio/loongson,ls-gpio.yaml       | 40 ++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/gpio/loongson,ls-gpio.yaml b/Documentation/devicetree/bindings/gpio/loongson,ls-gpio.yaml
index fb86e8ce6349..fc51cf40fccd 100644
--- a/Documentation/devicetree/bindings/gpio/loongson,ls-gpio.yaml
+++ b/Documentation/devicetree/bindings/gpio/loongson,ls-gpio.yaml
@@ -14,6 +14,7 @@ properties:
     enum:
       - loongson,ls2k-gpio
       - loongson,ls7a-gpio
+      - loongson,ls2k1000-gpio
 
   reg:
     maxItems: 1
@@ -29,6 +30,33 @@ properties:
 
   gpio-ranges: true
 
+  loongson,gpio-conf-offset:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      This option indicate this GPIO configuration register offset address.
+
+  loongson,gpio-out-offset:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      This option indicate this GPIO output register offset address.
+
+  loongson,gpio-in-offset:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      This option indicate this GPIO input register offset address.
+
+  loongson,gpio-ctrl-mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      This option indicate this GPIO control mode, where '0' represents
+      bit control mode and '1' represents byte control mode.
+
+  loongson,gpio-inten-offset:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      This option indicate this GPIO interrupt enable register offset
+      address.
+
   interrupts:
     minItems: 1
     maxItems: 64
@@ -39,6 +67,11 @@ required:
   - ngpios
   - "#gpio-cells"
   - gpio-controller
+  - loongson,gpio-conf-offset
+  - loongson,gpio-in-offset
+  - loongson,gpio-out-offset
+  - loongson,gpio-ctrl-mode
+  - loongson,gpio-inten-offset
   - gpio-ranges
   - interrupts
 
@@ -49,11 +82,16 @@ examples:
     #include <dt-bindings/interrupt-controller/irq.h>
 
     gpio0: gpio@1fe00500 {
-      compatible = "loongson,ls2k-gpio";
+      compatible = "loongson,ls2k1000-gpio";
       reg = <0x1fe00500 0x38>;
       ngpios = <64>;
       #gpio-cells = <2>;
       gpio-controller;
+      loongson,gpio-conf-offset = <0>;
+      loongson,gpio-in-offset = <0x20>;
+      loongson,gpio-out-offset = <0x10>;
+      loongson,gpio-ctrl-mode = <0>;
+      loongson,gpio-inten-offset = <0x30>;
       gpio-ranges = <&pctrl 0 0 15>,
                     <&pctrl 16 16 15>,
                     <&pctrl 32 32 10>,
-- 
2.20.1