[PATCH 1/2] ARM: dts: sun5i: Add touchscreen node to reference-design-tablet.dtsi

[PATCH 1/2] ARM: dts: sun5i: Add touchscreen node to reference-design-tablet.dtsi

[Hans de Goede]

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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 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>;
-	};
-
 };
 
 &reg_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>;
+	};
+
 	usb0_vbus_detect_pin: usb0_vbus_detect_pin@0 {
 		allwinner,pins = "PG1";
 		allwinner,function = "gpio_in";
-- 
2.9.3

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[PATCH 2/2] ARM: dts: sun8i: reference-design-tablet: ldo_io1 is vcc-touchscreen

[Hans de Goede]

On some Q8 and other tablets ldo_io1 is used as vcc-touchscreen,
config at as such in sun8i-reference-design-tablet.dtsi.

Note that it will only be enabled when it us actually referenced by
a foo-supply property in the touchscreen node, so for tablets which
do not use ldo_io1 as vcc-touchscreen, it will be disabled.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts | 7 -------
 arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi  | 7 +++++++
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts b/arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts
index a86cbed..21bb291 100644
--- a/arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts
+++ b/arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts
@@ -98,13 +98,6 @@
 	};
 };
 
-&reg_ldo_io1 {
-	regulator-min-microvolt = <3300000>;
-	regulator-max-microvolt = <3300000>;
-	regulator-name = "vcc-touchscreen";
-	status = "okay";
-};
-
 &touchscreen {
 	reg = <0x40>;
 	compatible = "silead,gsl1680";
diff --git a/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi b/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi
index 08cd001..69bc0cd 100644
--- a/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi
+++ b/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi
@@ -209,6 +209,13 @@
 	status = "okay";
 };
 
+&reg_ldo_io1 {
+	regulator-min-microvolt = <3300000>;
+	regulator-max-microvolt = <3300000>;
+	regulator-name = "vcc-touchscreen";
+	status = "okay";
+};
+
 &reg_rtc_ldo {
 	regulator-name = "vcc-rtc";
 };
-- 
2.9.3

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Re: [PATCH 1/2] ARM: dts: sun5i: Add touchscreen node to reference-design-tablet.dtsi

[Maxime Ripard]

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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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  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>;
> -	};
> -
>  };
>  
>  &reg_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

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [PATCH 2/2] ARM: dts: sun8i: reference-design-tablet: ldo_io1 is vcc-touchscreen

[Maxime Ripard]

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On Sun, Nov 13, 2016 at 08:22:03PM +0100, Hans de Goede wrote:
> On some Q8 and other tablets ldo_io1 is used as vcc-touchscreen,
> config at as such in sun8i-reference-design-tablet.dtsi.
> 
> Note that it will only be enabled when it us actually referenced by
> a foo-supply property in the touchscreen node, so for tablets which
> do not use ldo_io1 as vcc-touchscreen, it will be disabled.
> 
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Applied, thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [PATCH 1/2] ARM: dts: sun5i: Add touchscreen node to reference-design-tablet.dtsi

[Hans de Goede]

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@redhat.com>
>> ---
>>  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>;
>> -	};
>> -
>>  };
>>
>>  &reg_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

Re: [PATCH 1/2] ARM: dts: sun5i: Add touchscreen node to reference-design-tablet.dtsi

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 6182 bytes --]

Hi Hans,

On Tue, Nov 15, 2016 at 11:12:35AM +0100, Hans de Goede wrote:
> 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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> > > ---
> > >  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>;
> > > -	};
> > > -
> > >  };
> > > 
> > >  &reg_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.

Leaving them out will keep whatever state has been programmed. Putting
them in the DT will force them to whatever value has been set.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [PATCH 1/2] ARM: dts: sun5i: Add touchscreen node to reference-design-tablet.dtsi

[Hans de Goede]

Hi,

On 17-11-16 19:35, Maxime Ripard wrote:
> Hi Hans,
>
> On Tue, Nov 15, 2016 at 11:12:35AM +0100, Hans de Goede wrote:
>> 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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>>>> ---
>>>>  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>;
>>>> -	};
>>>> -
>>>>  };
>>>>
>>>>  &reg_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.
>
> Leaving them out will keep whatever state has been programmed. Putting
> them in the DT will force them to whatever value has been set.

Thanks for the answer, in the mean time I've send a v2 which leaves
them in using the new names (which according to your answer seems to
be the right thing to do).

Regards,

Hans
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