[RFC 1/4] dt-bindings: mfd: Add Gateworks System Controller bindings

Tim Harvey
2018-02-28T01:21:11Z

This patch adds documentation of device-tree bindings for the
Gateworks System Controller (GSC).

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
Documentation/devicetree/bindings/mfd/gsc.txt | 69 +++++++++++++++++++++++++++
1 file changed, 69 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mfd/gsc.txt

diff --git a/Documentation/devicetree/bindings/mfd/gsc.txt b/Documentation/devicetree/bindings/mfd/gsc.txt
new file mode 100644
index 0000000..7671347
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/gsc.txt
@@ -0,0 +1,159 @@
+Gateworks System Controller multi-function device
+
+The GSC is a Multifunction I2C slave device with the following submodules:
+- WDT
+- GPIO
+- Pushbutton controller
+- HWMON
+
+Required properties:
+- compatible : Must be "gw,gsc_v1", "gw,gsc_v2", "gw,gsc_v3"
+- reg: I2C address of the device
+- interrupts: interrupt triggered by GSC_IRQ# signal
+- interrupt-parent: Interrupt controller GSC is connected to
+- #interrupt-cells: should be <1>, index of the interrupt within the
+ controller, in accordance with the "one cell" variant of
+ <devicetree/bindings/interrupt-controller/interrupt.txt>
+
+Optional nodes:
+* watchdog:
+The GSC provides a Watchdog monitor which can power cycle the board's
+primary power supply on most board models when tripped.
+
+Required properties:
+- compatible: must be "gw,gsc-watchdog"
+
+* input:
+The GSC provides an input device capable of dispatching Linux Input events
+for user pushbutton events, tamper switch events, etc.
+
+Required properties:
+- compatible: must be "gw,gsc-input"
+
+* hwmon:
+The GSC provides a set of Analog to Digitcal Converter (ADC) pins used for
+temperature and/or voltage monitoring.
+
+Required properties:
+- compatible: must be "gw,gsc-hwmon"
+
+Example:
+
+ gsc: gsc at 20 {
+ compatible = "gw,gsc_v2";
+ reg = <0x20>;
+ interrupt-parent = <&gpio1>;
+ interrupts = <4 GPIO_ACTIVE_LOW>;
+ interrupt-controller;
+ #interrupt-cells = <1>;
+
+ gsc_input {
+ compatible = "gw,gsc-input";
+ };
+
+ gsc_watchdog {
+ compatible = "gw,gsc-watchdog";
+ };
+
+ gsc_hwmon {
+ compatible = "gw,gsc-hwmon";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ hwmon at 0 { /* A0: Board Temperature */
+ type = <0>;
+ reg = <0x00>;
+ label = "temp";
+ };
+
+ hwmon at 1 { /* A1: Input Voltage */
+ type = <1>;
+ reg = <0x02>;
+ label = "Vin";
+ };
+
+ hwmon at 2 { /* A2: 5P0 */
+ type = <1>;
+ reg = <0x0b>;
+ label = "5P0";
+ };
+
+ hwmon at 4 { /* A4: 0-5V input */
+ type = <1>;
+ reg = <0x14>;
+ label = "ANL0";
+ };
+
+ hwmon at 5 { /* A5: 2P5 PCIe/GigE */
+ type = <1>;
+ reg = <0x23>;
+ label = "2P5";
+ };
+
+ hwmon at 6 { /* A6: 1P8 Aud/Vid */
+ type = <1>;
+ reg = <0x1d>;
+ label = "1P8";
+ };
+
+ hwmon at 7 { /* A7: GPS */
+ type = <1>;
+ reg = <0x26>;
+ label = "GPS";
+ };
+
+ hwmon at 12 { /* A12: VDD_CORE */
+ type = <1>;
+ reg = <0x3>;
+ label = "VDD_CORE";
+ };
+
+ hwmon at 13 { /* A13: VDD_SOC */
+ type = <1>;
+ reg = <0x11>;
+ label = "VDD_SOC";
+ };
+
+ hwmon at 14 { /* A14: 1P0 PCIe SW */
+ type = <1>;
+ reg = <0x20>;
+ label = "1P0";
+ };
+
+ hwmon at 15 { /* fan0 */
+ type = <2>;
+ reg = <0x2c>;
+ label = "fan_50p";
+ };
+
+ hwmon at 16 { /* fan1 */
+ type = <2>;
+ reg = <0x2e>;
+ label = "fan_60p";
+ };
+
+ hwmon at 17 { /* fan2 */
+ type = <2>;
+ reg = <0x30>;
+ label = "fan_70p";
+ };
+
+ hwmon at 18 { /* fan3 */
+ type = <2>;
+ reg = <0x32>;
+ label = "fan_80p";
+ };
+
+ hwmon at 19 { /* fan4 */
+ type = <2>;
+ reg = <0x34>;
+ label = "fan_90p";
+ };
+
+ hwmon at 20 { /* fan5 */
+ type = <2>;
+ reg = <0x36>;
+ label = "fan_100p";
+ };
+ };
+ };
--
2.7.4