linux-kernel - [PATCH v2 1/3] dt-bindings: pinctrl: Add bindings for pinctrl-mchp-sgpio driver

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Message-ID: <20200903133528.8595-2-lars.povlsen@microchip.com>
Date:   Thu, 3 Sep 2020 15:35:26 +0200
From:   Lars Povlsen <lars.povlsen@...rochip.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Lars Povlsen <lars.povlsen@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        <devicetree@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: [PATCH v2 1/3] dt-bindings: pinctrl: Add bindings for pinctrl-mchp-sgpio driver

This adds DT bindings for the Microsemi/Microchip SGPIO controller,
bindings microchip,sparx5-sgpio, mscc,ocelot-sgpio and
mscc,luton-sgpio.

Signed-off-by: Lars Povlsen <lars.povlsen@...rochip.com>
---
 .../pinctrl/microchip,sparx5-sgpio.yaml       | 88 +++++++++++++++++++
 include/dt-bindings/gpio/mchp-sgpio.h         | 19 ++++
 2 files changed, 107 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/microchip,sparx5-sgpio.yaml
 create mode 100644 include/dt-bindings/gpio/mchp-sgpio.h

diff --git a/Documentation/devicetree/bindings/pinctrl/microchip,sparx5-sgpio.yaml b/Documentation/devicetree/bindings/pinctrl/microchip,sparx5-sgpio.yaml
new file mode 100644
index 000000000000..25a50ba9e893
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/microchip,sparx5-sgpio.yaml
@@ -0,0 +1,88 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/microchip,sparx5-sgpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microsemi/Microchip Serial GPIO controller
+
+maintainers:
+  - Lars Povlsen <lars.povlsen@...rochip.com>
+
+description: |
+  By using a serial interface, the SIO controller significantly extend
+  the number of available GPIOs with a minimum number of additional
+  pins on the device. The primary purpose of the SIO controllers is to
+  connect control signals from SFP modules and to act as an LED
+  controller.
+
+properties:
+  $nodename:
+    pattern: "gpio"
+
+  compatible:
+    enum:
+      - microchip,sparx5-sgpio
+      - mscc,ocelot-sgpio
+      - mscc,luton-sgpio
+
+  clocks:
+    maxItems: 1
+
+  gpio-controller: true
+
+  '#gpio-cells':
+    description: GPIO consumers must specify four arguments, first the
+      port number, then the bit number, then a input/output flag and
+      finally the GPIO flags (from include/dt-bindings/gpio/gpio.h).
+      The dt-bindings/gpio/mchp-sgpio.h file define manifest constants
+      PIN_INPUT and PIN_OUTPUT.
+    const: 4
+
+  gpio-ranges:
+    maxItems: 1
+
+  microchip,sgpio-port-ranges:
+    description: This is a sequence of tuples, defining intervals of
+      enabled ports in the serial input stream. The enabled ports must
+      match the hardware configuration in order for signals to be
+      properly written/read to/from the controller holding
+      registers. Being tuples, then number of arguments must be
+      even. The tuples mast be ordered (low, high) and are
+      inclusive. Arguments must be between 0 and 31.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 2
+    maxItems: 64
+
+  microchip,sgpio-frequency:
+    description: The sgpio controller frequency (Hz). This dictates
+      the serial bitstream speed, which again affects the latency in
+      getting control signals back and forth between external shift
+      registers. The speed must be no larger than half the system
+      clock, and larger than zero.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    default: 12500000
+
+required:
+  - compatible
+  - clocks
+  - gpio-controller
+  - '#gpio-cells'
+  - gpio-ranges
+  - microchip,sgpio-port-ranges
+
+examples:
+  - |
+    sgpio2: gpio@...1036c {
+        compatible = "microchip,sparx5-sgpio";
+        pinctrl-0 = <&sgpio0_pins>;
+        pinctrl-names = "default";
+        reg = <0x1101036c 0x100>;
+        clocks = <&sys_clk>;
+        gpio-controller;
+        gpio-ranges = <&sgpio0 0 0 192>;
+        #gpio-cells = <4>;
+        microchip,sgpio-port-ranges = <0 0 16 18 28 31>;
+        microchip,sgpio-frequency = <25000000>;
+    };
diff --git a/include/dt-bindings/gpio/mchp-sgpio.h b/include/dt-bindings/gpio/mchp-sgpio.h
new file mode 100644
index 000000000000..61b8aa75d870
--- /dev/null
+++ b/include/dt-bindings/gpio/mchp-sgpio.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * This header provides constants for binding the Microchip SGPIO
+ * driver.
+ *
+ */
+
+#ifndef _DT_BINDINGS_GPIO_MCHP_SGPIO_H
+#define _DT_BINDINGS_GPIO_MCHP_SGPIO_H
+
+#include <dt-bindings/gpio/gpio.h>
+
+/* mchp-sgpio specific pin type defines */
+#undef PIN_OUTPUT
+#undef PIN_INPUT
+#define PIN_OUTPUT	0
+#define PIN_INPUT	1
+
+#endif
--
2.27.0