RE: [PATCH v3 6/7] ARM: dts: iwg20d-q7-common: Add LCD support

[Fabrizio Castro <fabrizio.castro@bp.renesas.com>]

Hi Laurent,

Thank you for your feedback!

> From: linux-renesas-soc-owner@vger.kernel.org <linux-renesas-soc-owner@vger.kernel.org> On Behalf Of Laurent Pinchart
> Sent: 07 November 2019 20:55
> Subject: Re: [PATCH v3 6/7] ARM: dts: iwg20d-q7-common: Add LCD support
> 
> Hi Fabrizio,
> 
> Thank you for the patch.
> 
> On Thu, Nov 07, 2019 at 08:11:02PM +0000, Fabrizio Castro wrote:
> > The iwg20d comes with a 7" capacitive touch screen, therefore
> > add support for it.
> >
> > Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> >
> > ---
> > v2->v3:
> > * No change
> > v1->v2:
> > * No change
> > ---
> >  arch/arm/boot/dts/iwg20d-q7-common.dtsi  | 85 ++++++++++++++++++++++++++++++++
> >  arch/arm/boot/dts/iwg20d-q7-dbcm-ca.dtsi |  1 -
> >  2 files changed, 85 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm/boot/dts/iwg20d-q7-common.dtsi b/arch/arm/boot/dts/iwg20d-q7-common.dtsi
> > index ae75a1db..3428b8d 100644
> > --- a/arch/arm/boot/dts/iwg20d-q7-common.dtsi
> > +++ b/arch/arm/boot/dts/iwg20d-q7-common.dtsi
> > @@ -46,6 +46,49 @@
> >  		clock-frequency = <26000000>;
> >  	};
> >
> > +	lcd_backlight: backlight {
> > +		compatible = "pwm-backlight";
> > +
> > +		pwms = <&pwm3 0 5000000 0>;
> > +		brightness-levels = <0 4 8 16 32 64 128 255>;
> > +		default-brightness-level = <7>;
> > +		enable-gpios = <&gpio5 14 GPIO_ACTIVE_HIGH>;
> > +	};
> > +
> > +	lvds-receiver {
> > +		compatible = "lvds-decoder";
> 
> A specific compatible string is required.

Will document the specific compatible in the binding doc

> 
> I think the lvds-decoder driver should error out at probe time if only
> one compatible string is listed.

Ok, will modify the driver accordingly

> 
> > +		powerdown = <&gpio7 25 GPIO_ACTIVE_LOW>;
> 
> powerdown-gpios ?

That's a bug, well spotted.

> 
> > +
> > +		ports {
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +
> > +			port@0 {
> > +				reg = <0>;
> > +				lvds_receiver_in: endpoint {
> > +					remote-endpoint = <&lvds0_out>;
> > +				};
> > +			};
> > +			port@1 {
> > +				reg = <1>;
> > +				lvds_receiver_out: endpoint {
> > +					remote-endpoint = <&panel_in>;
> > +				};
> > +			};
> > +		};
> > +	};
> > +
> > +	panel {
> > +		compatible = "edt,etm0700g0dh6", "simple-panel";
> 
> There's no "simple-panel" compatible string defined anywhere as far as I
> can tell.

The usage of "simple-panel" as a compatible is widespread and really confusing. 
The fact that you made this comment is good enough for me to say we don't
need it, I'll take it out.

> 
> > +		backlight = <&lcd_backlight>;
> > +
> > +		port {
> > +			panel_in: endpoint {
> > +				remote-endpoint = <&lvds_receiver_out>;
> > +			};
> > +		};
> > +	};
> > +
> >  	reg_1p5v: 1p5v {
> >  		compatible = "regulator-fixed";
> >  		regulator-name = "1P5V";
> > @@ -120,6 +163,18 @@
> >  	status = "okay";
> >  };
> >
> > +&du {
> > +	status = "okay";
> > +};
> > +
> > +&gpio2 {
> > +	touch-interrupt {
> > +		gpio-hog;
> > +		gpios = <12 GPIO_ACTIVE_LOW>;
> > +		input;
> > +	};
> 
> Do you need this, with the touchpanel@38 node already listing the
> interrupt ?

Yes, unfortunately we do need this as the bootloader is poking with the gpio.
I can't fix this in the bootloader as we have no control over it.

Thanks,
Fab

> 
> > +};
> > +
> >  &hsusb {
> >  	status = "okay";
> >  	pinctrl-0 = <&usb0_pins>;
> > @@ -147,6 +202,25 @@
> >  		VDDIO-supply = <&reg_3p3v>;
> >  		VDDD-supply = <&reg_1p5v>;
> >  	};
> > +
> > +	touch: touchpanel@38 {
> > +		compatible = "edt,edt-ft5406";
> > +		reg = <0x38>;
> > +		interrupt-parent = <&gpio2>;
> > +		interrupts = <12 IRQ_TYPE_EDGE_FALLING>;
> > +	};
> > +};
> > +
> > +&lvds0 {
> > +	status = "okay";
> > +
> > +	ports {
> > +		port@1 {
> > +			lvds0_out: endpoint {
> > +				remote-endpoint = <&lvds_receiver_in>;
> > +			};
> > +		};
> > +	};
> >  };
> >
> >  &pci0 {
> > @@ -180,6 +254,11 @@
> >  		function = "i2c2";
> >  	};
> >
> > +	pwm3_pins: pwm3 {
> > +		groups = "pwm3";
> > +		function = "pwm3";
> > +	};
> > +
> >  	scif0_pins: scif0 {
> >  		groups = "scif0_data_d";
> >  		function = "scif0";
> > @@ -218,6 +297,12 @@
> >  	};
> >  };
> >
> > +&pwm3 {
> > +	pinctrl-0 = <&pwm3_pins>;
> > +	pinctrl-names = "default";
> > +	status = "okay";
> > +};
> > +
> >  &rcar_sound {
> >  	pinctrl-0 = <&sound_pins>;
> >  	pinctrl-names = "default";
> > diff --git a/arch/arm/boot/dts/iwg20d-q7-dbcm-ca.dtsi b/arch/arm/boot/dts/iwg20d-q7-dbcm-ca.dtsi
> > index 0e99df2..ede2e0c 100644
> > --- a/arch/arm/boot/dts/iwg20d-q7-dbcm-ca.dtsi
> > +++ b/arch/arm/boot/dts/iwg20d-q7-dbcm-ca.dtsi
> > @@ -39,7 +39,6 @@
> >  &du {
> >  	pinctrl-0 = <&du_pins>;
> >  	pinctrl-names = "default";
> > -	status = "okay";
> >
> >  	ports {
> >  		port@0 {
> 
> --
> Regards,
> 
> Laurent Pinchart