[PATCH 1/8] ARM: dts: sun8i: Use sun8i-reference-design-tablet for gt90h dts

[PATCH 1/8] ARM: dts: sun8i: Use sun8i-reference-design-tablet for gt90h dts

[Hans de Goede]

This results in quite a nice cleanup for this dts file.

As an added bonus this also enables full otg support. I've tested that
this works as advertised.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts | 192 +------------------------------
 1 file changed, 1 insertion(+), 191 deletions(-)

diff --git a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
index b2ce284..f27ebbb 100644
--- a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
+++ b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
@@ -42,70 +42,18 @@
 
 /dts-v1/;
 #include "sun8i-a23.dtsi"
-#include "sunxi-common-regulators.dtsi"
-
-#include <dt-bindings/gpio/gpio.h>
-#include <dt-bindings/input/input.h>
-#include <dt-bindings/pinctrl/sun4i-a10.h>
-#include <dt-bindings/pwm/pwm.h>
+#include "sun8i-reference-design-tablet.dtsi"
 
 / {
 	model = "Allwinner GT90H Dual Core Tablet (v4)";
 	compatible = "allwinner,gt90h-v4", "allwinner,sun8i-a23";
-
-	aliases {
-		serial0 = &r_uart;
-	};
-
-	backlight: backlight {
-		compatible = "pwm-backlight";
-		pinctrl-names = "default";
-		pinctrl-0 = <&bl_en_pin_gt90h>;
-		pwms = <&pwm 0 50000 PWM_POLARITY_INVERTED>;
-		brightness-levels = <0 10 20 30 40 50 60 70 80 90 100>;
-		default-brightness-level = <8>;
-		enable-gpios = <&pio 7 6 GPIO_ACTIVE_HIGH>; /* PH6 */
-	};
-
-	chosen {
-		stdout-path = "serial0:115200n8";
-	};
 };
 
 &ehci0 {
 	status = "okay";
 };
 
-&i2c0 {
-	pinctrl-names = "default";
-	pinctrl-0 = <&i2c0_pins_a>;
-	status = "okay";
-};
-
-&i2c1 {
-	pinctrl-names = "default";
-	pinctrl-0 = <&i2c1_pins_a>;
-	status = "okay";
-};
-
 &lradc {
-	vref-supply = <&reg_vcc3v0>;
-	status = "okay";
-
-	button@200 {
-		label = "Volume Up";
-		linux,code = <KEY_VOLUMEUP>;
-		channel = <0>;
-		voltage = <200000>;
-	};
-
-	button@400 {
-		label = "Volume Down";
-		linux,code = <KEY_VOLUMEDOWN>;
-		channel = <0>;
-		voltage = <400000>;
-	};
-
 	button@600 {
 		label = "Back";
 		linux,code = <KEY_BACK>;
@@ -114,144 +62,6 @@
 	};
 };
 
-&mmc0 {
-	pinctrl-names = "default";
-	pinctrl-0 = <&mmc0_pins_a>, <&mmc0_cd_pin_gt90h>;
-	vmmc-supply = <&reg_aldo1>;
-	bus-width = <4>;
-	cd-gpios = <&pio 1 4 GPIO_ACTIVE_HIGH>; /* PB4 */
-	cd-inverted;
-	status = "okay";
-};
-
-&pio {
-	bl_en_pin_gt90h: bl_en_pin@0 {
-		allwinner,pins = "PH6";
-		allwinner,function = "gpio_in";
-		allwinner,drive = <SUN4I_PINCTRL_10_MA>;
-		allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
-	};
-
-	mmc0_cd_pin_gt90h: mmc0_cd_pin@0 {
-		allwinner,pins = "PB4";
-		allwinner,function = "gpio_in";
-		allwinner,drive = <SUN4I_PINCTRL_10_MA>;
-		allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
-	};
-};
-
-&pwm {
-	pinctrl-names = "default";
-	pinctrl-0 = <&pwm0_pins>;
-	status = "okay";
-};
-
-&r_rsb {
-	status = "okay";
-
-	axp22x: pmic@3a3 {
-		compatible = "x-powers,axp223";
-		reg = <0x3a3>;
-		interrupt-parent = <&nmi_intc>;
-		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
-		eldoin-supply = <&reg_dcdc1>;
-	};
-};
-
-&r_uart {
-	pinctrl-names = "default";
-	pinctrl-0 = <&r_uart_pins_a>;
-	status = "okay";
-};
-
-#include "axp22x.dtsi"
-
-&reg_aldo1 {
-	regulator-always-on;
-	regulator-min-microvolt = <3000000>;
-	regulator-max-microvolt = <3000000>;
-	regulator-name = "vcc-io";
-};
-
-&reg_aldo2 {
-	regulator-always-on;
-	regulator-min-microvolt = <2350000>;
-	regulator-max-microvolt = <2650000>;
-	regulator-name = "vdd-dll";
-};
-
-&reg_aldo3 {
-	regulator-always-on;
-	regulator-min-microvolt = <2700000>;
-	regulator-max-microvolt = <3300000>;
-	regulator-name = "vcc-pll-avcc";
-};
-
-&reg_dc1sw {
-	regulator-name = "vcc-lcd";
-};
-
-&reg_dc5ldo {
-	regulator-always-on;
-	regulator-min-microvolt = <900000>;
-	regulator-max-microvolt = <1400000>;
-	regulator-name = "vdd-cpus";
-};
-
-&reg_dcdc1 {
-	regulator-always-on;
-	regulator-min-microvolt = <3000000>;
-	regulator-max-microvolt = <3000000>;
-	regulator-name = "vcc-3v0";
-};
-
-&reg_dcdc2 {
-	regulator-always-on;
-	regulator-min-microvolt = <900000>;
-	regulator-max-microvolt = <1400000>;
-	regulator-name = "vdd-sys";
-};
-
-&reg_dcdc3 {
-	regulator-always-on;
-	regulator-min-microvolt = <900000>;
-	regulator-max-microvolt = <1400000>;
-	regulator-name = "vdd-cpu";
-};
-
-&reg_dcdc5 {
-	regulator-always-on;
-	regulator-min-microvolt = <1500000>;
-	regulator-max-microvolt = <1500000>;
-	regulator-name = "vcc-dram";
-};
-
-&reg_dldo1 {
-	regulator-min-microvolt = <3300000>;
-	regulator-max-microvolt = <3300000>;
-	regulator-name = "vcc-wifi";
-};
-
-&reg_rtc_ldo {
-	regulator-name = "vcc-rtc";
-};
-
-&simplefb_lcd {
-	vcc-lcd-supply = <&reg_dc1sw>;
-};
-
-/*
- * FIXME for now we only support host mode and rely on u-boot to have
- * turned on Vbus which is controlled by the axp223 pmic on the board.
- *
- * Once we have axp223 support we should switch to fully supporting otg.
- */
-&usb_otg {
-	dr_mode = "host";
-	status = "okay";
-};
-
 &usbphy {
 	usb1_vbus-supply = <&reg_dldo1>;
-	status = "okay";
 };
-- 
2.7.4

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[PATCH 2/8] ARM: dts: sun8i: Add dt node for rtl8703as wifi chip on ga10h

[Hans de Goede]

The ga10h tablet has a rtl8703as wifi chip, add a dt node describing it.

This enables usage of wifi on this tablet (together with the out of
tree rtl8732bs driver).

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/sun8i-a33-ga10h-v1.1.dts | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-a33-ga10h-v1.1.dts b/arch/arm/boot/dts/sun8i-a33-ga10h-v1.1.dts
index 6566032..de6269d 100644
--- a/arch/arm/boot/dts/sun8i-a33-ga10h-v1.1.dts
+++ b/arch/arm/boot/dts/sun8i-a33-ga10h-v1.1.dts
@@ -47,6 +47,11 @@
 / {
 	model = "Allwinner GA10H Quad Core Tablet (v1.1)";
 	compatible = "allwinner,ga10h-v1.1", "allwinner,sun8i-a33";
+
+	aliases {
+		/* Make u-boot set mac-address for rtl8703as (no eeprom) */
+		ethernet0 = &rtl8703as;
+	};
 };
 
 &ehci0 {
@@ -62,6 +67,19 @@
 	};
 };
 
+&mmc1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&mmc1_pins_a>;
+	vmmc-supply = <&reg_dldo1>;
+	bus-width = <4>;
+	non-removable;
+	status = "okay";
+
+	rtl8703as: sdio_wifi@1 {
+		reg = <1>;
+	};
+};
+
 &ohci0 {
 	status = "okay";
 };
-- 
2.7.4

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Re: [PATCH 2/8] ARM: dts: sun8i: Add dt node for rtl8703as wifi chip on ga10h

[Chen-Yu Tsai]

On Tue, Aug 9, 2016 at 3:43 AM, Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> The ga10h tablet has a rtl8703as wifi chip, add a dt node describing it.
>
> This enables usage of wifi on this tablet (together with the out of
> tree rtl8732bs driver).
>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Acked-by: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>

Does the chip or board support out of band interrupts?
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Re: [PATCH 2/8] ARM: dts: sun8i: Add dt node for rtl8703as wifi chip on ga10h

[Hans de Goede]

Hi,

On 16-08-16 04:43, Chen-Yu Tsai wrote:
> On Tue, Aug 9, 2016 at 3:43 AM, Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
>> The ga10h tablet has a rtl8703as wifi chip, add a dt node describing it.
>>
>> This enables usage of wifi on this tablet (together with the out of
>> tree rtl8732bs driver).
>>
>> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>
> Acked-by: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
>
> Does the chip or board support out of band interrupts?

I believe so, but since the sunxi-mmc controller properly supports
sdio-irq-s (without needing to poll) there is not to much to win there,
so currently I've no plans to support this (this would require defining
a dt binding + dts changes + driver changes).

Regards,

Hans
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[PATCH 3/8] ARM: dts: sun8i: reference-design-tablet: Add gsl1680 touchscreen node

[Hans de Goede]

Almost all sun8i tablets use a gsl1680 touchscreen controller, so add
a node describing it to reference-design-tablet.dtsi.

Almost all, but not all, so mark it as disabled by default (dts files
will also need to supply a firmware-name and resolution info).

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 .../boot/dts/sun8i-reference-design-tablet.dtsi    | 28 ++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi b/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi
index 9d90361..f29897c 100644
--- a/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi
+++ b/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi
@@ -63,6 +63,27 @@
 	};
 };
 
+&i2c0 {
+	/*
+	 * The gsl1680 is rated at 400KHz and it will not work reliable at
+	 * 100KHz, this has been confirmed on multiple different q8 tablets.
+	 * The gsl1680 is the only device on this bus.
+	 */
+	clock-frequency = <400000>;
+
+	gsl1680: touchscreen@40 {
+		compatible = "silead,gsl1680";
+		reg = <0x40>;
+		interrupt-parent = <&pio>;
+		interrupts = <1 5 IRQ_TYPE_EDGE_FALLING>; /* PB5 */
+		pinctrl-names = "default";
+		pinctrl-0 = <&ts_power_pin>;
+		power-gpios = <&pio 7 1 GPIO_ACTIVE_HIGH>; /* PH1 */
+		/* Most tablets use this touchscreen, but not all */
+		status = "disabled";
+	};
+};
+
 &mmc0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&mmc0_pins_a>, <&mmc0_cd_pin>;
@@ -88,6 +109,13 @@
 		allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
 	};
 
+	ts_power_pin: ts_power_pin@0 {
+		allwinner,pins = "PH1";
+		allwinner,function = "gpio_out";
+		allwinner,drive = <SUN4I_PINCTRL_10_MA>;
+		allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
+	};
+
 	usb0_id_detect_pin: usb0_id_detect_pin@0 {
 		allwinner,pins = "PH8";
 		allwinner,function = "gpio_in";
-- 
2.7.4

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Re: [PATCH 3/8] ARM: dts: sun8i: reference-design-tablet: Add gsl1680 touchscreen node

[Chen-Yu Tsai]

On Tue, Aug 9, 2016 at 3:43 AM, Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> Almost all sun8i tablets use a gsl1680 touchscreen controller, so add
> a node describing it to reference-design-tablet.dtsi.
>
> Almost all, but not all, so mark it as disabled by default (dts files
> will also need to supply a firmware-name and resolution info).
>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Acked-by: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
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Re: [PATCH 3/8] ARM: dts: sun8i: reference-design-tablet: Add gsl1680 touchscreen node

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 580 bytes --]

On Mon, Aug 08, 2016 at 09:43:13PM +0200, Hans de Goede wrote:
> Almost all sun8i tablets use a gsl1680 touchscreen controller, so add
> a node describing it to reference-design-tablet.dtsi.
> 
> Almost all, but not all, so mark it as disabled by default (dts files
> will also need to supply a firmware-name and resolution info).
> 
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Applied the first three patches, thanks!
Maxime

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

[-- Attachment #2: signature.asc --]
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[PATCH 4/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

[Hans de Goede]

The gt90h tablet has a gsl3675 touchscreen, add a dt node describing it.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
index f27ebbb..da55b5a 100644
--- a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
+++ b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
@@ -53,6 +53,14 @@
 	status = "okay";
 };
 
+&gsl1680 {
+	compatible = "silead,gsl3675";
+	touchscreen-fw-name = "silead/gsl3675-gt90h.fw";
+	touchscreen-size-x = <1792>;
+	touchscreen-size-y = <1024>;
+	status = "okay";
+};
+
 &lradc {
 	button@600 {
 		label = "Back";
-- 
2.7.4

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Re: [PATCH 4/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

[Chen-Yu Tsai]

On Tue, Aug 9, 2016 at 3:43 AM, Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> The gt90h tablet has a gsl3675 touchscreen, add a dt node describing it.
>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Acked-by: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>

> ---
>  arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> index f27ebbb..da55b5a 100644
> --- a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> +++ b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> @@ -53,6 +53,14 @@
>         status = "okay";
>  };
>
> +&gsl1680 {
> +       compatible = "silead,gsl3675";

The silead binding should be updated with all the other
supported chips though. It currently only lists gsl1680.

> +       touchscreen-fw-name = "silead/gsl3675-gt90h.fw";
> +       touchscreen-size-x = <1792>;
> +       touchscreen-size-y = <1024>;
> +       status = "okay";
> +};
> +
>  &lradc {
>         button@600 {
>                 label = "Back";
> --
> 2.7.4
>
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Re: [PATCH 4/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

[Hans de Goede]

Hi,

On 16-08-16 04:47, Chen-Yu Tsai wrote:
> On Tue, Aug 9, 2016 at 3:43 AM, Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
>> The gt90h tablet has a gsl3675 touchscreen, add a dt node describing it.
>>
>> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>
> Acked-by: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
>
>> ---
>>  arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>> index f27ebbb..da55b5a 100644
>> --- a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>> +++ b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>> @@ -53,6 +53,14 @@
>>         status = "okay";
>>  };
>>
>> +&gsl1680 {
>> +       compatible = "silead,gsl3675";
>
> The silead binding should be updated with all the other
> supported chips though. It currently only lists gsl1680.

Good point. I've just send out a patch adding them.

Regards,

Hans



>
>> +       touchscreen-fw-name = "silead/gsl3675-gt90h.fw";
>> +       touchscreen-size-x = <1792>;
>> +       touchscreen-size-y = <1024>;
>> +       status = "okay";
>> +};
>> +
>>  &lradc {
>>         button@600 {
>>                 label = "Back";
>> --
>> 2.7.4
>>
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Re: [PATCH 4/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 943 bytes --]

On Mon, Aug 08, 2016 at 09:43:14PM +0200, Hans de Goede wrote:
> The gt90h tablet has a gsl3675 touchscreen, add a dt node describing it.
> 
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> index f27ebbb..da55b5a 100644
> --- a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> +++ b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> @@ -53,6 +53,14 @@
>  	status = "okay";
>  };
>  
> +&gsl1680 {
> +	compatible = "silead,gsl3675";
> +	touchscreen-fw-name = "silead/gsl3675-gt90h.fw";

That's not documented anywhere, and looks really suspicious.

Rob, is that even allowed?

Thanks,
Maxime

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

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Re: [PATCH 4/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

[Hans de Goede]

Hi,

On 22-08-16 20:30, Maxime Ripard wrote:
> On Mon, Aug 08, 2016 at 09:43:14PM +0200, Hans de Goede wrote:
>> The gt90h tablet has a gsl3675 touchscreen, add a dt node describing it.
>>
>> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>> ---
>>  arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>> index f27ebbb..da55b5a 100644
>> --- a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>> +++ b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>> @@ -53,6 +53,14 @@
>>  	status = "okay";
>>  };
>>
>> +&gsl1680 {
>> +	compatible = "silead,gsl3675";
>> +	touchscreen-fw-name = "silead/gsl3675-gt90h.fw";
>
> That's not documented anywhere, and looks really suspicious.

Ugh, that should have been in:

Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt

But somehow it is not (I believe it was there in earlier revisions of
the patch), I'll send a patch to fix this.

About it being suspicious, this is not really firmware it is a bunch
of configuration data / lookup tables for the controller which tell
it in which order the touchscreen horizontal / vertical sensor
lines are connected to its sense pins, and what values to send
for finger x% between line z and line z+1, which differs per
tablet model, since not all tablets use the same digitizer.

Regards,

Hans
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Re: [PATCH 4/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

[Icenowy Zheng]

23.08.2016, 03:08, "Hans de Goede" <hdegoede@redhat.com>:
> Hi,
>
> On 22-08-16 20:30, Maxime Ripard wrote:
>>  On Mon, Aug 08, 2016 at 09:43:14PM +0200, Hans de Goede wrote:
>>>  The gt90h tablet has a gsl3675 touchscreen, add a dt node describing it.
>>>
>>>  Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>>>  ---
>>>   arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts | 8 ++++++++
>>>   1 file changed, 8 insertions(+)
>>>
>>>  diff --git a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>>>  index f27ebbb..da55b5a 100644
>>>  --- a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>>>  +++ b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>>>  @@ -53,6 +53,14 @@
>>>           status = "okay";
>>>   };
>>>
>>>  +&gsl1680 {
>>>  + compatible = "silead,gsl3675";
>>>  + touchscreen-fw-name = "silead/gsl3675-gt90h.fw";
>>
>>  That's not documented anywhere, and looks really suspicious.
>
> Ugh, that should have been in:
>
> Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt
>
> But somehow it is not (I believe it was there in earlier revisions of
> the patch), I'll send a patch to fix this.
>
> About it being suspicious, this is not really firmware it is a bunch
> of configuration data / lookup tables for the controller which tell
> it in which order the touchscreen horizontal / vertical sensor
> lines are connected to its sense pins, and what values to send
> for finger x% between line z and line z+1, which differs per
> tablet model, since not all tablets use the same digitizer.

I do think it's a mixture of executable MCU codes and data.
The GSL1680 datasheet indicates that there's a 32-bit MCU in it.

>
> Regards,
>
> Hans
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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Re: [PATCH 4/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 1967 bytes --]

On Mon, Aug 22, 2016 at 09:03:57PM +0200, Hans de Goede wrote:
> Hi,
> 
> On 22-08-16 20:30, Maxime Ripard wrote:
> >On Mon, Aug 08, 2016 at 09:43:14PM +0200, Hans de Goede wrote:
> >>The gt90h tablet has a gsl3675 touchscreen, add a dt node describing it.
> >>
> >>Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> >>---
> >> arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts | 8 ++++++++
> >> 1 file changed, 8 insertions(+)
> >>
> >>diff --git a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> >>index f27ebbb..da55b5a 100644
> >>--- a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> >>+++ b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> >>@@ -53,6 +53,14 @@
> >> 	status = "okay";
> >> };
> >>
> >>+&gsl1680 {
> >>+	compatible = "silead,gsl3675";
> >>+	touchscreen-fw-name = "silead/gsl3675-gt90h.fw";
> >
> >That's not documented anywhere, and looks really suspicious.
> 
> Ugh, that should have been in:
> 
> Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt
> 
> But somehow it is not (I believe it was there in earlier revisions of
> the patch), I'll send a patch to fix this.
> 
> About it being suspicious, this is not really firmware it is a bunch
> of configuration data / lookup tables for the controller which tell
> it in which order the touchscreen horizontal / vertical sensor
> lines are connected to its sense pins, and what values to send
> for finger x% between line z and line z+1, which differs per
> tablet model, since not all tablets use the same digitizer.

It's not really the firmware itself that I find suspicious, but more
the encoding of a path to a file in the DT, especially when you can
apparently derive it from other informations already found in the DT
(<vendor>/<compatible>-<board>.fw)

Thanks,
Maxime

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

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Re: [PATCH 4/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

[Hans de Goede]

Hi,

On 23-08-16 11:26, Maxime Ripard wrote:
> On Mon, Aug 22, 2016 at 09:03:57PM +0200, Hans de Goede wrote:
>> Hi,
>>
>> On 22-08-16 20:30, Maxime Ripard wrote:
>>> On Mon, Aug 08, 2016 at 09:43:14PM +0200, Hans de Goede wrote:
>>>> The gt90h tablet has a gsl3675 touchscreen, add a dt node describing it.
>>>>
>>>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>>>> ---
>>>> arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts | 8 ++++++++
>>>> 1 file changed, 8 insertions(+)
>>>>
>>>> diff --git a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>>>> index f27ebbb..da55b5a 100644
>>>> --- a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>>>> +++ b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>>>> @@ -53,6 +53,14 @@
>>>> 	status = "okay";
>>>> };
>>>>
>>>> +&gsl1680 {
>>>> +	compatible = "silead,gsl3675";
>>>> +	touchscreen-fw-name = "silead/gsl3675-gt90h.fw";
>>>
>>> That's not documented anywhere, and looks really suspicious.
>>
>> Ugh, that should have been in:
>>
>> Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt
>>
>> But somehow it is not (I believe it was there in earlier revisions of
>> the patch), I'll send a patch to fix this.
>>
>> About it being suspicious, this is not really firmware it is a bunch
>> of configuration data / lookup tables for the controller which tell
>> it in which order the touchscreen horizontal / vertical sensor
>> lines are connected to its sense pins, and what values to send
>> for finger x% between line z and line z+1, which differs per
>> tablet model, since not all tablets use the same digitizer.
>
> It's not really the firmware itself that I find suspicious, but more
> the encoding of a path to a file in the DT,

It is not a path it is a filename. We could drop the "silead/" prefix
and put that in the driver instead to really make it a filename.

> especially when you can
> apparently derive it from other informations already found in the DT
> (<vendor>/<compatible>-<board>.fw)

That will not work, sometimes different boards use the same digitizer
and thus the same firmware. Also in case of the q8 tablets, we need
different firmware for different variants (this is to be dealt with
by the q8-hardware-manager I'm working on), since although they
all use the same digitizer they do not wire it up to the controllers
pins the same in all models, so we need different firmware files
corresponding to different wirings.

TL;DR: There is no 1:1 mapping between board and the firmware filename.

Also note that this is not the first driver to introduce a firmware
filename in a dts binding, a quick grep shows at least:

Documentation/devicetree/bindings/remoteproc/wkup_m3_rproc.txt

Also does this, as well as several dt-bindings where board specific
firmware gets embedded in the device tree itself.

Regards,

Hans

Re: [PATCH 4/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

[Maxime Ripard]

[-- Attachment #1.1: Type: text/plain, Size: 3354 bytes --]

On Tue, Aug 23, 2016 at 11:39:06AM +0200, Hans de Goede wrote:
> Hi,
> 
> On 23-08-16 11:26, Maxime Ripard wrote:
> >On Mon, Aug 22, 2016 at 09:03:57PM +0200, Hans de Goede wrote:
> >>Hi,
> >>
> >>On 22-08-16 20:30, Maxime Ripard wrote:
> >>>On Mon, Aug 08, 2016 at 09:43:14PM +0200, Hans de Goede wrote:
> >>>>The gt90h tablet has a gsl3675 touchscreen, add a dt node describing it.
> >>>>
> >>>>Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> >>>>---
> >>>>arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts | 8 ++++++++
> >>>>1 file changed, 8 insertions(+)
> >>>>
> >>>>diff --git a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> >>>>index f27ebbb..da55b5a 100644
> >>>>--- a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> >>>>+++ b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> >>>>@@ -53,6 +53,14 @@
> >>>>	status = "okay";
> >>>>};
> >>>>
> >>>>+&gsl1680 {
> >>>>+	compatible = "silead,gsl3675";
> >>>>+	touchscreen-fw-name = "silead/gsl3675-gt90h.fw";
> >>>
> >>>That's not documented anywhere, and looks really suspicious.
> >>
> >>Ugh, that should have been in:
> >>
> >>Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt
> >>
> >>But somehow it is not (I believe it was there in earlier revisions of
> >>the patch), I'll send a patch to fix this.
> >>
> >>About it being suspicious, this is not really firmware it is a bunch
> >>of configuration data / lookup tables for the controller which tell
> >>it in which order the touchscreen horizontal / vertical sensor
> >>lines are connected to its sense pins, and what values to send
> >>for finger x% between line z and line z+1, which differs per
> >>tablet model, since not all tablets use the same digitizer.
> >
> >It's not really the firmware itself that I find suspicious, but more
> >the encoding of a path to a file in the DT,
> 
> It is not a path it is a filename. We could drop the "silead/" prefix
> and put that in the driver instead to really make it a filename.
> 
> >especially when you can
> >apparently derive it from other informations already found in the DT
> >(<vendor>/<compatible>-<board>.fw)
> 
> That will not work, sometimes different boards use the same digitizer
> and thus the same firmware. Also in case of the q8 tablets, we need
> different firmware for different variants (this is to be dealt with
> by the q8-hardware-manager I'm working on), since although they
> all use the same digitizer they do not wire it up to the controllers
> pins the same in all models, so we need different firmware files
> corresponding to different wirings.
> 
> TL;DR: There is no 1:1 mapping between board and the firmware filename.

The point still holds. It's exactly the same case than the broadcom
nvram filename discussion, and it raised the same issues.

> Also note that this is not the first driver to introduce a firmware
> filename in a dts binding, a quick grep shows at least:
> 
> Documentation/devicetree/bindings/remoteproc/wkup_m3_rproc.txt
> 
> Also does this, as well as several dt-bindings where board specific
> firmware gets embedded in the device tree itself.

Which has never been acked by any of the DT maintainers.

Maxime

-- 
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Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [PATCH 4/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

[Hans de Goede]

Hi,

On 08/23/2016 05:17 PM, Maxime Ripard wrote:
> On Tue, Aug 23, 2016 at 11:39:06AM +0200, Hans de Goede wrote:
>> Hi,
>>
>> On 23-08-16 11:26, Maxime Ripard wrote:
>>> On Mon, Aug 22, 2016 at 09:03:57PM +0200, Hans de Goede wrote:
>>>> Hi,
>>>>
>>>> On 22-08-16 20:30, Maxime Ripard wrote:
>>>>> On Mon, Aug 08, 2016 at 09:43:14PM +0200, Hans de Goede wrote:
>>>>>> The gt90h tablet has a gsl3675 touchscreen, add a dt node describing it.
>>>>>>
>>>>>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>>>>>> ---
>>>>>> arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts | 8 ++++++++
>>>>>> 1 file changed, 8 insertions(+)
>>>>>>
>>>>>> diff --git a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>>>>>> index f27ebbb..da55b5a 100644
>>>>>> --- a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>>>>>> +++ b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>>>>>> @@ -53,6 +53,14 @@
>>>>>> 	status = "okay";
>>>>>> };
>>>>>>
>>>>>> +&gsl1680 {
>>>>>> +	compatible = "silead,gsl3675";
>>>>>> +	touchscreen-fw-name = "silead/gsl3675-gt90h.fw";
>>>>>
>>>>> That's not documented anywhere, and looks really suspicious.
>>>>
>>>> Ugh, that should have been in:
>>>>
>>>> Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt
>>>>
>>>> But somehow it is not (I believe it was there in earlier revisions of
>>>> the patch), I'll send a patch to fix this.
>>>>
>>>> About it being suspicious, this is not really firmware it is a bunch
>>>> of configuration data / lookup tables for the controller which tell
>>>> it in which order the touchscreen horizontal / vertical sensor
>>>> lines are connected to its sense pins, and what values to send
>>>> for finger x% between line z and line z+1, which differs per
>>>> tablet model, since not all tablets use the same digitizer.
>>>
>>> It's not really the firmware itself that I find suspicious, but more
>>> the encoding of a path to a file in the DT,
>>
>> It is not a path it is a filename. We could drop the "silead/" prefix
>> and put that in the driver instead to really make it a filename.
>>
>>> especially when you can
>>> apparently derive it from other informations already found in the DT
>>> (<vendor>/<compatible>-<board>.fw)
>>
>> That will not work, sometimes different boards use the same digitizer
>> and thus the same firmware. Also in case of the q8 tablets, we need
>> different firmware for different variants (this is to be dealt with
>> by the q8-hardware-manager I'm working on), since although they
>> all use the same digitizer they do not wire it up to the controllers
>> pins the same in all models, so we need different firmware files
>> corresponding to different wirings.
>>
>> TL;DR: There is no 1:1 mapping between board and the firmware filename.
>
> The point still holds. It's exactly the same case than the broadcom
> nvram filename discussion, and it raised the same issues.

No it is not, in this case we also want to be able to specify
different fw names on devices using the same base dts, here
is a tablet for all the q8 tablets with gsl1680 I've:

a13-94v-0:		a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600 inverted-x
a13-tzx-713b-v2.1:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600
a23-q8h-v3:		a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
a23-tj-a23-q88-v4.0:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600
a23-tw-ao721-v41:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600 inverted-x
a23-ippo-q8h-v1.2:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
a33-ippo-q8h-v1.2:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
a33-tzx-723q4:		b482 a33-Q8_V2.4_1118/GSL1680_FW_D702.fw		 960x640 inverted-x
a33-q8-v2.4-1118:	b482 a33-Q8_V2.4_1118/GSL1680_FW_D702.fw		 960x640
a33-q8h-v1.5:		b482 a33-q8h-v1.5/GSL1688_A70_FW.fw			 960x640

I'm working on a q8hardware-mgr (inspired by the beagle bone cape mgr)
to automatically detect the touchscreen controller as well as the controller id
(the 2nd column above), and it will need to set a filename for the firmware
file based on this, deriving this from the machine compatible will
simply not work here.

Regards,

Hans

Re: [PATCH 4/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 4954 bytes --]

On Tue, Aug 23, 2016 at 05:59:50PM +0200, Hans de Goede wrote:
> Hi,
> 
> On 08/23/2016 05:17 PM, Maxime Ripard wrote:
> >On Tue, Aug 23, 2016 at 11:39:06AM +0200, Hans de Goede wrote:
> >>Hi,
> >>
> >>On 23-08-16 11:26, Maxime Ripard wrote:
> >>>On Mon, Aug 22, 2016 at 09:03:57PM +0200, Hans de Goede wrote:
> >>>>Hi,
> >>>>
> >>>>On 22-08-16 20:30, Maxime Ripard wrote:
> >>>>>On Mon, Aug 08, 2016 at 09:43:14PM +0200, Hans de Goede wrote:
> >>>>>>The gt90h tablet has a gsl3675 touchscreen, add a dt node describing it.
> >>>>>>
> >>>>>>Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> >>>>>>---
> >>>>>>arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts | 8 ++++++++
> >>>>>>1 file changed, 8 insertions(+)
> >>>>>>
> >>>>>>diff --git a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> >>>>>>index f27ebbb..da55b5a 100644
> >>>>>>--- a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> >>>>>>+++ b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
> >>>>>>@@ -53,6 +53,14 @@
> >>>>>>	status = "okay";
> >>>>>>};
> >>>>>>
> >>>>>>+&gsl1680 {
> >>>>>>+	compatible = "silead,gsl3675";
> >>>>>>+	touchscreen-fw-name = "silead/gsl3675-gt90h.fw";
> >>>>>
> >>>>>That's not documented anywhere, and looks really suspicious.
> >>>>
> >>>>Ugh, that should have been in:
> >>>>
> >>>>Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt
> >>>>
> >>>>But somehow it is not (I believe it was there in earlier revisions of
> >>>>the patch), I'll send a patch to fix this.
> >>>>
> >>>>About it being suspicious, this is not really firmware it is a bunch
> >>>>of configuration data / lookup tables for the controller which tell
> >>>>it in which order the touchscreen horizontal / vertical sensor
> >>>>lines are connected to its sense pins, and what values to send
> >>>>for finger x% between line z and line z+1, which differs per
> >>>>tablet model, since not all tablets use the same digitizer.
> >>>
> >>>It's not really the firmware itself that I find suspicious, but more
> >>>the encoding of a path to a file in the DT,
> >>
> >>It is not a path it is a filename. We could drop the "silead/" prefix
> >>and put that in the driver instead to really make it a filename.
> >>
> >>>especially when you can
> >>>apparently derive it from other informations already found in the DT
> >>>(<vendor>/<compatible>-<board>.fw)
> >>
> >>That will not work, sometimes different boards use the same digitizer
> >>and thus the same firmware. Also in case of the q8 tablets, we need
> >>different firmware for different variants (this is to be dealt with
> >>by the q8-hardware-manager I'm working on), since although they
> >>all use the same digitizer they do not wire it up to the controllers
> >>pins the same in all models, so we need different firmware files
> >>corresponding to different wirings.
> >>
> >>TL;DR: There is no 1:1 mapping between board and the firmware filename.
> >
> >The point still holds. It's exactly the same case than the broadcom
> >nvram filename discussion, and it raised the same issues.
> 
> No it is not, in this case we also want to be able to specify
> different fw names on devices using the same base dts, here
> is a tablet for all the q8 tablets with gsl1680 I've:

At least two other dev told you exactly that in that thread though:
http://lists.infradead.org/pipermail/linux-arm-kernel/2016-June/439978.html
http://lists.infradead.org/pipermail/linux-arm-kernel/2016-June/440024.html

> 
> a13-94v-0:		a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600 inverted-x
> a13-tzx-713b-v2.1:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600
> a23-q8h-v3:		a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
> a23-tj-a23-q88-v4.0:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600
> a23-tw-ao721-v41:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600 inverted-x
> a23-ippo-q8h-v1.2:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
> a33-ippo-q8h-v1.2:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
> a33-tzx-723q4:		b482 a33-Q8_V2.4_1118/GSL1680_FW_D702.fw		 960x640 inverted-x
> a33-q8-v2.4-1118:	b482 a33-Q8_V2.4_1118/GSL1680_FW_D702.fw		 960x640
> a33-q8h-v1.5:		b482 a33-q8h-v1.5/GSL1688_A70_FW.fw			 960x640
> 
> I'm working on a q8hardware-mgr (inspired by the beagle bone cape mgr)
> to automatically detect the touchscreen controller as well as the controller id
> (the 2nd column above), and it will need to set a filename for the firmware
> file based on this, deriving this from the machine compatible will
> simply not work here.

I'm not sure why we need to stick to some insane naming scheme. Or why
can't we use symlinks.

Maxime

-- 
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Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [PATCH 4/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

[Hans de Goede]

Hi,

On 26-08-16 22:46, Maxime Ripard wrote:
> On Tue, Aug 23, 2016 at 05:59:50PM +0200, Hans de Goede wrote:
>> Hi,
>>
>> On 08/23/2016 05:17 PM, Maxime Ripard wrote:
>>> On Tue, Aug 23, 2016 at 11:39:06AM +0200, Hans de Goede wrote:
>>>> Hi,
>>>>
>>>> On 23-08-16 11:26, Maxime Ripard wrote:
>>>>> On Mon, Aug 22, 2016 at 09:03:57PM +0200, Hans de Goede wrote:
>>>>>> Hi,
>>>>>>
>>>>>> On 22-08-16 20:30, Maxime Ripard wrote:
>>>>>>> On Mon, Aug 08, 2016 at 09:43:14PM +0200, Hans de Goede wrote:
>>>>>>>> The gt90h tablet has a gsl3675 touchscreen, add a dt node describing it.
>>>>>>>>
>>>>>>>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>>>>>>>> ---
>>>>>>>> arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts | 8 ++++++++
>>>>>>>> 1 file changed, 8 insertions(+)
>>>>>>>>
>>>>>>>> diff --git a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>>>>>>>> index f27ebbb..da55b5a 100644
>>>>>>>> --- a/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>>>>>>>> +++ b/arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts
>>>>>>>> @@ -53,6 +53,14 @@
>>>>>>>> 	status = "okay";
>>>>>>>> };
>>>>>>>>
>>>>>>>> +&gsl1680 {
>>>>>>>> +	compatible = "silead,gsl3675";
>>>>>>>> +	touchscreen-fw-name = "silead/gsl3675-gt90h.fw";
>>>>>>>
>>>>>>> That's not documented anywhere, and looks really suspicious.
>>>>>>
>>>>>> Ugh, that should have been in:
>>>>>>
>>>>>> Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt
>>>>>>
>>>>>> But somehow it is not (I believe it was there in earlier revisions of
>>>>>> the patch), I'll send a patch to fix this.
>>>>>>
>>>>>> About it being suspicious, this is not really firmware it is a bunch
>>>>>> of configuration data / lookup tables for the controller which tell
>>>>>> it in which order the touchscreen horizontal / vertical sensor
>>>>>> lines are connected to its sense pins, and what values to send
>>>>>> for finger x% between line z and line z+1, which differs per
>>>>>> tablet model, since not all tablets use the same digitizer.
>>>>>
>>>>> It's not really the firmware itself that I find suspicious, but more
>>>>> the encoding of a path to a file in the DT,
>>>>
>>>> It is not a path it is a filename. We could drop the "silead/" prefix
>>>> and put that in the driver instead to really make it a filename.
>>>>
>>>>> especially when you can
>>>>> apparently derive it from other informations already found in the DT
>>>>> (<vendor>/<compatible>-<board>.fw)
>>>>
>>>> That will not work, sometimes different boards use the same digitizer
>>>> and thus the same firmware. Also in case of the q8 tablets, we need
>>>> different firmware for different variants (this is to be dealt with
>>>> by the q8-hardware-manager I'm working on), since although they
>>>> all use the same digitizer they do not wire it up to the controllers
>>>> pins the same in all models, so we need different firmware files
>>>> corresponding to different wirings.
>>>>
>>>> TL;DR: There is no 1:1 mapping between board and the firmware filename.
>>>
>>> The point still holds. It's exactly the same case than the broadcom
>>> nvram filename discussion, and it raised the same issues.
>>
>> No it is not, in this case we also want to be able to specify
>> different fw names on devices using the same base dts, here
>> is a tablet for all the q8 tablets with gsl1680 I've:
>
> At least two other dev told you exactly that in that thread though:
> http://lists.infradead.org/pipermail/linux-arm-kernel/2016-June/439978.html
> http://lists.infradead.org/pipermail/linux-arm-kernel/2016-June/440024.html

That is a different scenario / different mail thread,
I agree that the solution proposed there should work
for the brcmfmac driver.

But that is _not_ what we're discussing here.

>> a13-94v-0:		a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600 inverted-x
>> a13-tzx-713b-v2.1:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600
>> a23-q8h-v3:		a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
>> a23-tj-a23-q88-v4.0:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600
>> a23-tw-ao721-v41:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600 inverted-x
>> a23-ippo-q8h-v1.2:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
>> a33-ippo-q8h-v1.2:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
>> a33-tzx-723q4:		b482 a33-Q8_V2.4_1118/GSL1680_FW_D702.fw		 960x640 inverted-x
>> a33-q8-v2.4-1118:	b482 a33-Q8_V2.4_1118/GSL1680_FW_D702.fw		 960x640
>> a33-q8h-v1.5:		b482 a33-q8h-v1.5/GSL1688_A70_FW.fw			 960x640
>>
>> I'm working on a q8hardware-mgr (inspired by the beagle bone cape mgr)
>> to automatically detect the touchscreen controller as well as the controller id
>> (the 2nd column above), and it will need to set a filename for the firmware
>> file based on this, deriving this from the machine compatible will
>> simply not work here.
>
> I'm not sure why we need to stick to some insane naming scheme. Or why
> can't we use symlinks.

All the above tablets use the same dts file (sun5i-a13-q8-tablet.dts,
sun8i-a23-q8-tablet.dts, sun8i-a33-q8-tablet.dts) while not having
the same touchscreen, as discussed in the past I'm working on a kernel
module to detect which touchscreen is in use and then automatically
update the dt using dynamic-devicetree since creating a separate dt
file for each variant is madness (there is a new revision every few
weeks).

I already have this sort of working and I can detect if a tablet has
a gsl1680 touchscreen (*) and if it is the a082 or b482 variant. Now
we could encode the chip-id (the a082/b482) in the firmware name
at the driver level, but that is still not good enough, e.g. these
2 tablets:

a23-q8h-v3:		a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
a23-tj-a23-q88-v4.0:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600

Both use a a082 revision gsl1680 but need different firmware files,
since they both use sun8i-a23-q8-tablet.dts, so simply embedding
the machine compatible string in the filename passed to
request_firmware is not going to help.

I hope to get permission to get these firmware files added to
linux-firmware and then the different files need unique names,
and we need a way to specify in devicetree which file to load.

We can do some weird indirect dance but that is not really
helpful, esp. since I also expect users to need to override
which firmware file gets used in certain cases and in that
scenario simply specifying the filename certainly is the most
userfriendly.

TL;DR: we need a way to specify which firmware needs to
be loaded and this CANNOT be derived from the machine
compatible as devices with the same machine compatible
need different firmwares.

Regards,

Hans



*) Not all a13/a23/a33 tablets have a gsl1680 touchscreen, I'm also
working on detecting other controllers

Re: [PATCH 4/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 3513 bytes --]

On Sat, Aug 27, 2016 at 10:32:16AM +0200, Hans de Goede wrote:
> >>a13-94v-0:		a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600 inverted-x
> >>a13-tzx-713b-v2.1:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600
> >>a23-q8h-v3:		a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
> >>a23-tj-a23-q88-v4.0:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600
> >>a23-tw-ao721-v41:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600 inverted-x
> >>a23-ippo-q8h-v1.2:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
> >>a33-ippo-q8h-v1.2:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
> >>a33-tzx-723q4:		b482 a33-Q8_V2.4_1118/GSL1680_FW_D702.fw		 960x640 inverted-x
> >>a33-q8-v2.4-1118:	b482 a33-Q8_V2.4_1118/GSL1680_FW_D702.fw		 960x640
> >>a33-q8h-v1.5:		b482 a33-q8h-v1.5/GSL1688_A70_FW.fw			 960x640
> >>
> >>I'm working on a q8hardware-mgr (inspired by the beagle bone cape mgr)
> >>to automatically detect the touchscreen controller as well as the controller id
> >>(the 2nd column above), and it will need to set a filename for the firmware
> >>file based on this, deriving this from the machine compatible will
> >>simply not work here.
> >
> >I'm not sure why we need to stick to some insane naming scheme. Or why
> >can't we use symlinks.
> 
> All the above tablets use the same dts file (sun5i-a13-q8-tablet.dts,
> sun8i-a23-q8-tablet.dts, sun8i-a33-q8-tablet.dts) while not having
> the same touchscreen, as discussed in the past I'm working on a kernel
> module to detect which touchscreen is in use and then automatically
> update the dt using dynamic-devicetree since creating a separate dt
> file for each variant is madness (there is a new revision every few
> weeks).
> 
> I already have this sort of working and I can detect if a tablet has
> a gsl1680 touchscreen (*) and if it is the a082 or b482 variant. Now
> we could encode the chip-id (the a082/b482) in the firmware name
> at the driver level, but that is still not good enough, e.g. these
> 2 tablets:
> 
> a23-q8h-v3:		a082 a23-tj-a23-q88-v4.0_20140815/GSL1688_A70_FW.fw	 800x480 swapped-x-y
> a23-tj-a23-q88-v4.0:	a082 a23-tj-a23-q88-v4.0_20140815/GSL1680E_700_FW.fw	1024x600
> 
> Both use a a082 revision gsl1680 but need different firmware files,
> since they both use sun8i-a23-q8-tablet.dts, so simply embedding
> the machine compatible string in the filename passed to
> request_firmware is not going to help.
> 
> I hope to get permission to get these firmware files added to
> linux-firmware and then the different files need unique names,
> and we need a way to specify in devicetree which file to load.
> 
> We can do some weird indirect dance but that is not really
> helpful, esp. since I also expect users to need to override
> which firmware file gets used in certain cases and in that
> scenario simply specifying the filename certainly is the most
> userfriendly.
> 
> TL;DR: we need a way to specify which firmware needs to
> be loaded and this CANNOT be derived from the machine
> compatible as devices with the same machine compatible
> need different firmwares.

You convinced me. Let's see Rob's answer, on your new serie, but since
it's what he suggested, that should be ok.

I'll merge it as soon as he's ok with it.

Maxime

-- 
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Embedded Linux and Kernel engineering
http://free-electrons.com

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[PATCH 5/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-inet86dz

[Hans de Goede]

The inet86dz tablet has a gsl1680 touchscreen,
add a dt node describing it.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/sun8i-a23-inet86dz.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-a23-inet86dz.dts b/arch/arm/boot/dts/sun8i-a23-inet86dz.dts
index 0f9f71b..9972021 100644
--- a/arch/arm/boot/dts/sun8i-a23-inet86dz.dts
+++ b/arch/arm/boot/dts/sun8i-a23-inet86dz.dts
@@ -53,6 +53,13 @@
 	status = "okay";
 };
 
+&gsl1680 {
+	touchscreen-size-x = <960>;
+	touchscreen-size-y = <640>;
+	touchscreen-fw-name = "silead/gsl1680-inet86dz.fw";
+	status = "okay";
+};
+
 &usbphy {
 	usb1_vbus-supply = <&reg_dldo1>;
 };
-- 
2.7.4

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Re: [PATCH 5/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-inet86dz

[Chen-Yu Tsai]

On Tue, Aug 9, 2016 at 3:43 AM, Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> The inet86dz tablet has a gsl1680 touchscreen,
> add a dt node describing it.
>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Acked-by: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
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[PATCH 6/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-polaroid-mid2407pxe03

[Hans de Goede]

Add a node enabling the gsl1680 touchscreen controller found on
sun8i-a23-polaroid-mid2407pxe03 tablets.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts b/arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts
index e300442..cd64fd61 100644
--- a/arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts
+++ b/arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts
@@ -48,3 +48,20 @@
 	model = "Polaroid MID2407PXE03 tablet";
 	compatible = "polaroid,mid2407pxe03", "allwinner,sun8i-a23";
 };
+
+&gsl1680 {
+	touchscreen-size-x = <960>;
+	touchscreen-size-y = <640>;
+	touchscreen-inverted-x;
+	touchscreen-inverted-y;
+	touchscreen-fw-name = "silead/gsl1680-polaroid-mid2407pxe03.fw";
+	status = "okay";
+};
+
+&reg_ldo_io1 {
+	regulator-always-on;
+	regulator-min-microvolt = <3300000>;
+	regulator-max-microvolt = <3300000>;
+	regulator-name = "vcc-touchscreen";
+	status = "okay";
+};
-- 
2.7.4

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Re: [PATCH 6/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-polaroid-mid2407pxe03

[Chen-Yu Tsai]

Hi,

On Tue, Aug 9, 2016 at 3:43 AM, Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> Add a node enabling the gsl1680 touchscreen controller found on
> sun8i-a23-polaroid-mid2407pxe03 tablets.
>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>
> diff --git a/arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts b/arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts
> index e300442..cd64fd61 100644
> --- a/arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts
> +++ b/arch/arm/boot/dts/sun8i-a23-polaroid-mid2407pxe03.dts
> @@ -48,3 +48,20 @@
>         model = "Polaroid MID2407PXE03 tablet";
>         compatible = "polaroid,mid2407pxe03", "allwinner,sun8i-a23";
>  };
> +
> +&gsl1680 {
> +       touchscreen-size-x = <960>;
> +       touchscreen-size-y = <640>;
> +       touchscreen-inverted-x;
> +       touchscreen-inverted-y;
> +       touchscreen-fw-name = "silead/gsl1680-polaroid-mid2407pxe03.fw";
> +       status = "okay";
> +};
> +
> +&reg_ldo_io1 {
> +       regulator-always-on;
> +       regulator-min-microvolt = <3300000>;
> +       regulator-max-microvolt = <3300000>;
> +       regulator-name = "vcc-touchscreen";
> +       status = "okay";
> +};

This looks good, but it would be better if the touchscreen node
took the regulator as a supply.

Regards
ChenYu
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[PATCH 7/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-polaroid-mid2809pxe04

[Hans de Goede]

Add a node enabling the gsl3670 touchscreen controller found on
sun8i-a23-polaroid-mid2809pxe04 tablets.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts b/arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts
index 6d06e24..70d9339 100644
--- a/arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts
+++ b/arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts
@@ -48,3 +48,11 @@
 	model = "Polaroid MID2809PXE04 tablet";
 	compatible = "polaroid,mid2809pxe04", "allwinner,sun8i-a23";
 };
+
+&gsl1680 {
+	compatible = "silead,gsl3670";
+	touchscreen-fw-name = "silead/gsl3670-polaroid-mid2809pxe04.fw";
+	touchscreen-size-x = <1660>;
+	touchscreen-size-y = <890>;
+	status = "okay";
+};
-- 
2.7.4

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Re: [PATCH 7/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a23-polaroid-mid2809pxe04

[Chen-Yu Tsai]

On Tue, Aug 9, 2016 at 3:43 AM, Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> Add a node enabling the gsl3670 touchscreen controller found on
> sun8i-a23-polaroid-mid2809pxe04 tablets.
>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Acked-by: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
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[PATCH 8/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a33-ga10h

[Hans de Goede]

The ga10h tablet has a gsl3675 touchscreen, add a dt node describing it.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/sun8i-a33-ga10h-v1.1.dts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-a33-ga10h-v1.1.dts b/arch/arm/boot/dts/sun8i-a33-ga10h-v1.1.dts
index de6269d..2fea1af 100644
--- a/arch/arm/boot/dts/sun8i-a33-ga10h-v1.1.dts
+++ b/arch/arm/boot/dts/sun8i-a33-ga10h-v1.1.dts
@@ -58,6 +58,15 @@
 	status = "okay";
 };
 
+&gsl1680 {
+	compatible = "silead,gsl3675";
+	touchscreen-fw-name = "silead/gsl3675-ga10h.fw";
+	touchscreen-size-x = <1630>;
+	touchscreen-size-y = <990>;
+	touchscreen-inverted-y;
+	status = "okay";
+};
+
 &lradc {
 	button@600 {
 		label = "Back";
-- 
2.7.4

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Re: [PATCH 8/8] ARM: dts: sun8i: Add touchscreen node for sun8i-a33-ga10h

[Chen-Yu Tsai]

On Tue, Aug 9, 2016 at 3:43 AM, Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> The ga10h tablet has a gsl3675 touchscreen, add a dt node describing it.
>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Acked-by: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
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Re: [PATCH 1/8] ARM: dts: sun8i: Use sun8i-reference-design-tablet for gt90h dts

[Chen-Yu Tsai]

On Tue, Aug 9, 2016 at 3:43 AM, Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> This results in quite a nice cleanup for this dts file.
>
> As an added bonus this also enables full otg support. I've tested that
> this works as advertised.
>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Acked-by: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
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