Hi, On 14-11-16 21:08, Maxime Ripard wrote:
Hi, On Sun, Nov 13, 2016 at 08:22:02PM +0100, Hans de Goede wrote:Just like on sun8i all sun5i tablets use the same interrupt and power gpios for their touchscreens. I've checked all known a13 fex files and only the UTOO P66 uses a different gpio for the interrupt. Add a touchscreen node to sun5i-reference-design-tablet.dtsi, which fills in the necessary gpios to avoid duplication in the tablet dts files, just like we do in sun8i-reference-design-tablet.dtsi. This will make future patches adding touchscreen nodes to a13 tablets simpler. Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> --- arch/arm/boot/dts/sun5i-a13-utoo-p66.dts | 38 ++++++++-------------- .../boot/dts/sun5i-reference-design-tablet.dtsi | 25 ++++++++++++++ 2 files changed, 39 insertions(+), 24 deletions(-) diff --git a/arch/arm/boot/dts/sun5i-a13-utoo-p66.dts b/arch/arm/boot/dts/sun5i-a13-utoo-p66.dts index a8b0bcc..3d7ff10 100644 --- a/arch/arm/boot/dts/sun5i-a13-utoo-p66.dts +++ b/arch/arm/boot/dts/sun5i-a13-utoo-p66.dts @@ -83,22 +83,6 @@ allwinner,pins = "PG3"; }; -&i2c1 { - icn8318: touchscreen@40 { - compatible = "chipone,icn8318"; - reg = <0x40>; - interrupt-parent = <&pio>; - interrupts = <6 9 IRQ_TYPE_EDGE_FALLING>; /* EINT9 (PG9) */ - pinctrl-names = "default"; - pinctrl-0 = <&ts_wake_pin_p66>; - wake-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>; /* PB3 */ - touchscreen-size-x = <800>; - touchscreen-size-y = <480>; - touchscreen-inverted-x; - touchscreen-swapped-x-y; - }; -}; - &mmc2 { pinctrl-names = "default"; pinctrl-0 = <&mmc2_pins_a>; @@ -121,20 +105,26 @@ allwinner,drive = <SUN4I_PINCTRL_10_MA>; allwinner,pull = <SUN4I_PINCTRL_PULL_UP>; }; - - ts_wake_pin_p66: ts_wake_pin@0 { - allwinner,pins = "PB3"; - allwinner,function = "gpio_out"; - allwinner,drive = <SUN4I_PINCTRL_10_MA>; - allwinner,pull = <SUN4I_PINCTRL_NO_PULL>; - }; - }; ®_usb0_vbus { gpio = <&pio 1 4 GPIO_ACTIVE_HIGH>; /* PB4 */ }; +&touchscreen { + compatible = "chipone,icn8318"; + reg = <0x40>; + /* The P66 uses a different EINT then the reference design */ + interrupts = <6 9 IRQ_TYPE_EDGE_FALLING>; /* EINT9 (PG9) */ + /* The icn8318 binding expects wake-gpios instead of power-gpios */ + wake-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>; /* PB3 */ + touchscreen-size-x = <800>; + touchscreen-size-y = <480>; + touchscreen-inverted-x; + touchscreen-swapped-x-y; + status = "okay"; +}; + &uart1 { /* The P66 uses the uart pins as gpios */ status = "disabled"; diff --git a/arch/arm/boot/dts/sun5i-reference-design-tablet.dtsi b/arch/arm/boot/dts/sun5i-reference-design-tablet.dtsi index 20cc940..7af488a 100644 --- a/arch/arm/boot/dts/sun5i-reference-design-tablet.dtsi +++ b/arch/arm/boot/dts/sun5i-reference-design-tablet.dtsi @@ -41,6 +41,7 @@ */ #include "sunxi-reference-design-tablet.dtsi" +#include <dt-bindings/interrupt-controller/irq.h> #include <dt-bindings/pwm/pwm.h> / { @@ -84,6 +85,23 @@ }; &i2c1 { + /* + * The gsl1680 is rated at 400KHz and it will not work reliable at + * 100KHz, this has been confirmed on multiple different q8 tablets. + * All other devices on this bus are also rated for 400KHz. + */ + clock-frequency = <400000>; + + touchscreen: touchscreen { + interrupt-parent = <&pio>; + interrupts = <6 11 IRQ_TYPE_EDGE_FALLING>; /* EINT11 (PG11) */ + pinctrl-names = "default"; + pinctrl-0 = <&ts_power_pin>; + power-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>; /* PB3 */ + /* Tablet dts must provide reg and compatible */ + status = "disabled"; + }; + pcf8563: rtc@51 { compatible = "nxp,pcf8563"; reg = <0x51>; @@ -125,6 +143,13 @@ allwinner,pull = <SUN4I_PINCTRL_PULL_UP>; }; + ts_power_pin: ts_power_pin { + allwinner,pins = "PB3"; + allwinner,function = "gpio_out"; + allwinner,drive = <SUN4I_PINCTRL_10_MA>; + allwinner,pull = <SUN4I_PINCTRL_NO_PULL>; + }; +For the next release, we'll switch to the generic pin mux properties ("pins" and "function"), and we actually implemented the fact that the drive and pull properties are optional, so you can drop them both. You'll need next + http://lists.infradead.org/pipermail/linux-arm-kernel/2016-November/467123.html
Ok, before I send a v2 first a question about this, for the touchscreen case I actually need: allwinner,drive = <SUN4I_PINCTRL_10_MA>; allwinner,pull = <SUN4I_PINCTRL_NO_PULL>; Because otherwise when the touchscreen controller is powered by a separate regulator and that regulator is off, then it may draw just enough current from its enable pin to be sort-of listening to the i2c bus and mess up that bus. So is this the default, or do we get the power-on default when not specifying these? If it is the power-on default then we do need to specify these, because AFAICT the power-on drive strength typically is 20 mA. Regards, Hans -- 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
