On Tue, 31 Mar 2015 07:43:38 -0700 Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> wrote: > Hi, > > On Tue, Mar 31, 2015 at 11:18:17AM +0300, Aleksei Mamlin wrote: > > This patch adds nodes for the Goodix GT911 touchscreen controller found > > on the Wexler TAB7200 tablet. Controller uses one of following I2C > > addresses: 0x5d or 0x14, so just add two nodes. > > In which case are these different addresses encountered? Different > revisions of the same board? > According to the datasheet it is a feature of the controller. The address(0x5d or 0x14) can be configured using a reset sequence, which has not yet been implemented in the driver. > > > Signed-off-by: Aleksei Mamlin <mamlinav@xxxxxxxxx> > > --- > > DT support for the Goodix GT911 touchscreen controller has been queued up > > by Dmitry Torokhov for merging into 4.1: > > https://git.kernel.org/cgit/linux/kernel/git/dtor/input.git/commit/?h=next&id=771d8f1b178e7e09fcc641fccd48852958dbc329 > > > > IRQ flags are set by the touchscreen controller driver, so use IRQ_TYPE_NONE. > > > > arch/arm/boot/dts/sun7i-a20-wexler-tab7200.dts | 14 ++++++++++++++ > > 1 file changed, 14 insertions(+) > > > > diff --git a/arch/arm/boot/dts/sun7i-a20-wexler-tab7200.dts b/arch/arm/boot/dts/sun7i-a20-wexler-tab7200.dts > > index 2ad3b09..34e2bce 100644 > > --- a/arch/arm/boot/dts/sun7i-a20-wexler-tab7200.dts > > +++ b/arch/arm/boot/dts/sun7i-a20-wexler-tab7200.dts > > @@ -101,6 +101,20 @@ > > pinctrl-names = "default"; > > pinctrl-0 = <&i2c2_pins_a>; > > status = "okay"; > > + > > + gt911@5d { > > The node name should be the class of the device. touchscreen in this > case. > > > + compatible = "goodix,gt911"; > > + reg = <0x5d>; > > + interrupt-parent = <&pio>; > > + interrupts = <21 IRQ_TYPE_NONE>; /* EINT21 (PH21) */ > > Unfortunately, IRQ_TYPE_NONE is not a valid value for the GIC > bindings. > > You're also not adding a pinctrl group for that pin? > > > + }; > > + > > + gt911@14 { > > + compatible = "goodix,gt911"; > > + reg = <0x14>; > > + interrupt-parent = <&pio>; > > + interrupts = <21 IRQ_TYPE_NONE>; /* EINT21 (PH21) */ > > + }; > > And nodes should be ordered by addresses ascending order. > > Thanks! > Maxime > > -- > Maxime Ripard, Free Electrons > Embedded Linux, Kernel and Android engineering > http://free-electrons.com -- Thanks and regards, Aleksei Mamlin -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
