Allwinnner A13 / A23 / A33 based Q8 tablets are popular cheap 7" tablets
of which a new batch is produced every few weeks. Each batch uses a
different mix of touchscreen, accelerometer and wifi peripherals.
Given that each batch is different creating a devicetree for each variant
is not desirable, work is being done on a Q8 tablet hardware manager which
auto-detects the touchscreen and accelerometer and will update the dt with
what it has found, so that a single generic dt can be used for these tablets.
This commit adds dt-bindings for this hardware manager.
Note the wifi is connected to a discoverable bus (sdio or usb) and will be
autodetected by the mmc resp. usb subsystems.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
.../misc/allwinner,sunxi-q8-hardwaremgr.txt | 71 ++++++++++++++++++++++
1 file changed, 71 insertions(+)
create mode 100644 Documentation/devicetree/bindings/misc/allwinner,sunxi-q8-hardwaremgr.txt
diff --git a/Documentation/devicetree/bindings/misc/allwinner,sunxi-q8-hardwaremgr.txt b/Documentation/devicetree/bindings/misc/allwinner,sunxi-q8-hardwaremgr.txt
new file mode 100644
index 0000000..a81b258
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/allwinner,sunxi-q8-hardwaremgr.txt
@@ -0,0 +1,71 @@
+Q8 tablet hardware manager
+--------------------------
+
+Allwinnner A13 / A23 / A33 based Q8 tablets are popular cheap 7" tablets of
+which a new batch is produced every few weeks. Each batch uses a different
+mix of touchscreen, accelerometer and wifi peripherals.
+
+Given that each batch is different creating a devicetree for each variant is
+not desirable. The Q8 tablet hardware manager bindings are bindings for an os
+module which auto-detects the touchscreen and accelerometer so that a single
+generic dts can be used for these tablets.
+
+The wifi is connected to a discoverable bus and will be autodetected by the os.
+
+Required properties:
+ - toplevel / machine compatible, one of:
+ "allwinner,q8-a13"
+ "allwinner,q8-a23"
+ "allwinner,q8-a33"
+ - touchscreen node : There must be a template touchscreen node named
+ "touchscreen", this must be a child node of the
+ touchscreen i2c bus
+ - accelerometer node : There must be a template accelerometer node named
+ "accelerometer", this must be a child node of the
+ accelerometer i2c bus
+
+touchscreen node required properties:
+ - interrupt-parent : phandle pointing to the interrupt controller
+ serving the touchscreen interrupt
+ - interrupts : interrupt specification for the touchscreen interrupt
+ - power-gpios : Specification for the pin connected to the touchscreen's
+ enable / wake pin. This needs to be driven high to
+ enable the touchscreen controller
+
+touchscreen node optional properties:
+ - vddio-supply : regulator phandle for the touchscreen vddio supply
+
+accelerometer node optional properties:
+ - interrupt-parent : phandle pointing to the interrupt controller
+ serving the accelerometer interrupt
+ - interrupts : interrupt specification for the accelerometer interrupt
+
+Example:
+
+/ {
+ compatible = "allwinner,q8-a23", "allwinner,sun8i-a23";
+};
+
+&i2c0 {
+ touchscreen: touchscreen@0 {
+ interrupt-parent = <&pio>;
+ interrupts = <1 5 IRQ_TYPE_EDGE_FALLING>; /* PB5 */
+ power-gpios = <&pio 7 1 GPIO_ACTIVE_HIGH>; /* PH1 */
+ vddio-supply = <®_ldo_io1>;
+ /*
+ * Enabled by sunxi-q8-hardwaremgr if it detects a
+ * known model touchscreen.
+ */
+ status = "disabled";
+ };
+};
+
+&i2c1 {
+ accelerometer: accelerometer@0 {
+ /*
+ * Enabled by sunxi-q8-hardwaremgr if it detects a
+ * known model accelerometer.
+ */
+ status = "disabled";
+ };
+};
--
2.9.3
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