realtek: backport gpio-realtek-otto driver from 5.13 to 5.10

This patch backports "gpio-realtek-otto" driver to Kernel 5.10.
"MACH_REALTEK_RTL" is used as a platform name in upstream, but "RTL838X"
is used in OpenWrt, so update the dependency by the additional patch.

Note: GPIO mapping is changed in the upstreamed driver.

  old - new

   24 -  0
   25 -  1
   26 -  2
   27 -  3
   28 -  4
   29 -  5
   30 -  6
   31 -  7
   16 -  8
   17 -  9
   18 - 10
   19 - 11
   20 - 12
   21 - 13
   22 - 14
   23 - 15
    8 - 16
    9 - 17
   10 - 18
   11 - 19
   12 - 20
   13 - 21
   14 - 22
   15 - 23

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>

1 files changed, 109 insertions, 0 deletions

diff --git a/target/linux/realtek/patches-5.10/001-5.13-dt-bindings-gpio-binding-for-realtek-otto-gpio.patch b/target/linux/realtek/patches-5.10/001-5.13-dt-bindings-gpio-binding-for-realtek-otto-gpio.patch
new file mode 100644
index 0000000000..111591c640
--- /dev/null
+++ b/target/linux/realtek/patches-5.10/001-5.13-dt-bindings-gpio-binding-for-realtek-otto-gpio.patch
@@ -0,0 +1,109 @@
+From a362c0ce64866939c3daa17c76943cfed555b065 Mon Sep 17 00:00:00 2001
+From: Sander Vanheule <sander@svanheule.net>
+Date: Tue, 30 Mar 2021 19:48:42 +0200
+Subject: dt-bindings: gpio: Binding for Realtek Otto GPIO
+
+Add a binding description for Realtek's GPIO controller found on several
+of their MIPS-based SoCs (codenamed Otto), such as the RTL838x and
+RTL839x series of switch SoCs.
+
+A fallback binding 'realtek,otto-gpio' is provided for cases where the
+actual port ordering is not known yet, and enabling the interrupt
+controller may result in uncaught interrupts.
+
+Signed-off-by: Sander Vanheule <sander@svanheule.net>
+Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
+Reviewed-by: Rob Herring <robh@kernel.org>
+Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
+---
+ .../bindings/gpio/realtek,otto-gpio.yaml           | 78 ++++++++++++++++++++++
+ 1 file changed, 78 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/gpio/realtek,otto-gpio.yaml
+
+diff --git a/Documentation/devicetree/bindings/gpio/realtek,otto-gpio.yaml b/Documentation/devicetree/bindings/gpio/realtek,otto-gpio.yaml
+new file mode 100644
+index 0000000000000..100f20cebd76a
+--- /dev/null
++++ b/Documentation/devicetree/bindings/gpio/realtek,otto-gpio.yaml
+@@ -0,0 +1,78 @@
++# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
++%YAML 1.2
++---
++$id: http://devicetree.org/schemas/gpio/realtek,otto-gpio.yaml#
++$schema: http://devicetree.org/meta-schemas/core.yaml#
++
++title: Realtek Otto GPIO controller
++
++maintainers:
++  - Sander Vanheule <sander@svanheule.net>
++  - Bert Vermeulen <bert@biot.com>
++
++description: |
++  Realtek's GPIO controller on their MIPS switch SoCs (Otto platform) consists
++  of two banks of 32 GPIOs. These GPIOs can generate edge-triggered interrupts.
++  Each bank's interrupts are cascased into one interrupt line on the parent
++  interrupt controller, if provided.
++  This binding allows defining a single bank in the devicetree. The interrupt
++  controller is not supported on the fallback compatible name, which only
++  allows for GPIO port use.
++
++properties:
++  $nodename:
++    pattern: "^gpio@[0-9a-f]+$"
++
++  compatible:
++    items:
++      - enum:
++          - realtek,rtl8380-gpio
++          - realtek,rtl8390-gpio
++      - const: realtek,otto-gpio
++
++  reg:
++    maxItems: 1
++
++  "#gpio-cells":
++    const: 2
++
++  gpio-controller: true
++
++  ngpios:
++    minimum: 1
++    maximum: 32
++
++  interrupt-controller: true
++
++  "#interrupt-cells":
++    const: 2
++
++  interrupts:
++    maxItems: 1
++
++required:
++  - compatible
++  - reg
++  - "#gpio-cells"
++  - gpio-controller
++
++additionalProperties: false
++
++dependencies:
++  interrupt-controller: [ interrupts ]
++
++examples:
++  - |
++      gpio@3500 {
++        compatible = "realtek,rtl8380-gpio", "realtek,otto-gpio";
++        reg = <0x3500 0x1c>;
++        gpio-controller;
++        #gpio-cells = <2>;
++        ngpios = <24>;
++        interrupt-controller;
++        #interrupt-cells = <2>;
++        interrupt-parent = <&rtlintc>;
++        interrupts = <23>;
++      };
++
++...
+-- 
+cgit 1.2.3-1.el7
+