| Message ID | 20201205053328.9535-2-digetx@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Support wakeup methods of Atmel maXTouch controllers | expand |
On Sat, Dec 5, 2020 at 6:34 AM Dmitry Osipenko <digetx@gmail.com> wrote: > Some Atmel touchscreen controllers have a WAKE line that needs to be > asserted low in order to wake up controller from a deep sleep. Document > the wakeup methods and the wake-GPIO properties. > > Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Looks really useful! > + atmel,wakeup-method: > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: | > + The WAKE line is an active-low input that is used to wake up the touch > + controller from deep-sleep mode before communication with the controller > + could be started. This feature used to minimize current consumption > + when the controller is in deep sleep mode. > + > + The WAKE pin can be connected in one of the following ways: > + 1) left permanently low > + 2) connected to the I2C-compatible SCL pin > + 3) connected to a GPIO pin on the host > + enum: > + - 0 # ATMEL_MXT_WAKEUP_NONE > + - 1 # ATMEL_MXT_WAKEUP_I2C_SCL > + - 2 # ATMEL_MXT_WAKEUP_GPIO So you can add: minimum: 0 maximum: 2 I suppose? With that: Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Yours, Linus Walleij
Hello Linus, 06.12.2020 18:13, Linus Walleij пишет: > On Sat, Dec 5, 2020 at 6:34 AM Dmitry Osipenko <digetx@gmail.com> wrote: > >> Some Atmel touchscreen controllers have a WAKE line that needs to be >> asserted low in order to wake up controller from a deep sleep. Document >> the wakeup methods and the wake-GPIO properties. >> >> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> > > Looks really useful! > >> + atmel,wakeup-method: >> + $ref: /schemas/types.yaml#/definitions/uint32 >> + description: | >> + The WAKE line is an active-low input that is used to wake up the touch >> + controller from deep-sleep mode before communication with the controller >> + could be started. This feature used to minimize current consumption >> + when the controller is in deep sleep mode. >> + >> + The WAKE pin can be connected in one of the following ways: >> + 1) left permanently low >> + 2) connected to the I2C-compatible SCL pin >> + 3) connected to a GPIO pin on the host >> + enum: >> + - 0 # ATMEL_MXT_WAKEUP_NONE >> + - 1 # ATMEL_MXT_WAKEUP_I2C_SCL >> + - 2 # ATMEL_MXT_WAKEUP_GPIO > > So you can add: > minimum: 0 > maximum: 2 > > I suppose? The min/max ranges aren't needed for the enums because the min/max are already implied. I skimmed through a few yamls that use enums, just to be sure, nobody sets the min/max for a enum. I noticed that some bindings use "default: value" for enums, perhaps it will be good to set default=0 for this property, I'll improve it in v3. > With that: > Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Thank you for taking a look at the patch!
diff --git a/Documentation/devicetree/bindings/input/atmel,maxtouch.yaml b/Documentation/devicetree/bindings/input/atmel,maxtouch.yaml index 8c6418f76e94..7924a16dc248 100644 --- a/Documentation/devicetree/bindings/input/atmel,maxtouch.yaml +++ b/Documentation/devicetree/bindings/input/atmel,maxtouch.yaml @@ -39,6 +39,13 @@ properties: (active low). The line must be flagged with GPIO_ACTIVE_LOW. + wake-gpios: + maxItems: 1 + description: + Optional GPIO specifier for the touchscreen's wake pin + (active low). The line must be flagged with + GPIO_ACTIVE_LOW. + linux,gpio-keymap: $ref: /schemas/types.yaml#/definitions/uint32-array description: | @@ -53,6 +60,23 @@ properties: or experiment to determine which bit corresponds to which input. Use KEY_RESERVED for unused padding values. + atmel,wakeup-method: + $ref: /schemas/types.yaml#/definitions/uint32 + description: | + The WAKE line is an active-low input that is used to wake up the touch + controller from deep-sleep mode before communication with the controller + could be started. This feature used to minimize current consumption + when the controller is in deep sleep mode. + + The WAKE pin can be connected in one of the following ways: + 1) left permanently low + 2) connected to the I2C-compatible SCL pin + 3) connected to a GPIO pin on the host + enum: + - 0 # ATMEL_MXT_WAKEUP_NONE + - 1 # ATMEL_MXT_WAKEUP_I2C_SCL + - 2 # ATMEL_MXT_WAKEUP_GPIO + required: - compatible - reg @@ -63,6 +87,7 @@ additionalProperties: false examples: - | #include <dt-bindings/interrupt-controller/irq.h> + #include <dt-bindings/input/atmel-maxtouch.h> #include <dt-bindings/gpio/gpio.h> i2c { #address-cells = <1>; @@ -75,6 +100,7 @@ examples: reset-gpios = <&gpio 27 GPIO_ACTIVE_LOW>; vdda-supply = <&ab8500_ldo_aux2_reg>; vdd-supply = <&ab8500_ldo_aux5_reg>; + atmel,wakeup-method = <ATMEL_MXT_WAKEUP_I2C_SCL>; }; }; diff --git a/include/dt-bindings/input/atmel-maxtouch.h b/include/dt-bindings/input/atmel-maxtouch.h new file mode 100644 index 000000000000..7345ab32224d --- /dev/null +++ b/include/dt-bindings/input/atmel-maxtouch.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ + +#ifndef _DT_BINDINGS_ATMEL_MAXTOUCH_H +#define _DT_BINDINGS_ATMEL_MAXTOUCH_H + +#define ATMEL_MXT_WAKEUP_NONE 0 +#define ATMEL_MXT_WAKEUP_I2C_SCL 1 +#define ATMEL_MXT_WAKEUP_GPIO 2 + +#endif /* _DT_BINDINGS_ATMEL_MAXTOUCH_H */
Some Atmel touchscreen controllers have a WAKE line that needs to be asserted low in order to wake up controller from a deep sleep. Document the wakeup methods and the wake-GPIO properties. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- .../bindings/input/atmel,maxtouch.yaml | 26 +++++++++++++++++++ include/dt-bindings/input/atmel-maxtouch.h | 10 +++++++ 2 files changed, 36 insertions(+) create mode 100644 include/dt-bindings/input/atmel-maxtouch.h