linux-kernel - Re: [PATCH v7 5/5] ARM: dts: rockchip: add support mipi panel tv080wum-nl0

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Date:	Wed, 20 Jan 2016 23:25:03 +0100
From:	Heiko Stuebner <heiko@...ech.de>
To:	Chris Zhong <zyw@...k-chips.com>
Cc:	linux-rockchip@...ts.infradead.org, mark.yao@...k-chips.com,
	treding@...dia.com, Russell King <linux@....linux.org.uk>,
	devicetree@...r.kernel.org, Kumar Gala <galak@...eaurora.org>,
	linux-kernel@...r.kernel.org,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v7 5/5] ARM: dts: rockchip: add support mipi panel tv080wum-nl0

Am Mittwoch, 20. Januar 2016, 09:09:03 schrieb Chris Zhong:
> Hi Heiko
> 
> On 01/20/2016 03:26 AM, Heiko Stuebner wrote:
> > Hi Chris,
> > 
> > Am Mittwoch, 6. Januar 2016, 12:03:57 schrieb Chris Zhong:
> >> This tv080wum-nl0 panel is a mipi panel, it can use in MIPI_TX socket
> >> of rk3288 evb board.
> >> 
> >> Signed-off-by: Chris Zhong <zyw@...k-chips.com>
> > 
> > [...]
> > 
> >> diff --git a/arch/arm/boot/dts/rk3288-evb-act8846.dts
> >> b/arch/arm/boot/dts/rk3288-evb-act8846.dts index e662147..7d5475b
> >> 100644
> >> --- a/arch/arm/boot/dts/rk3288-evb-act8846.dts
> >> +++ b/arch/arm/boot/dts/rk3288-evb-act8846.dts
> >> @@ -50,6 +50,8 @@
> >> 
> >>   		gpio = <&gpio7 3 GPIO_ACTIVE_HIGH>;
> >>   		pinctrl-names = "default";
> >>   		pinctrl-0 = <&lcd_en>;
> >> 
> >> +		regulator-always-on;
> >> +		regulator-boot-on;
> > 
> > Is this only needed for the panel itself and can you try to get the
> > panel
> > supplies set up correctly instead in that case please?
> 
> It is not only for panel, LCDC_VDD need this supply too.
> And rk3288-evb-rk808.dts has set this regulator to always on, so I do
> the same thing in here.

ok, so we keep the regulator-always-on for now, but could probably still add 
the supply to the panel as well? That way once vcc_lcd handling is complete 
in the future, we don't get surprises :-)

I guess I can add that power-supply property myself when applying.


Heiko

> 
> >>   		regulator-name = "vcc_lcd";
> >>   		vin-supply = <&vcc_io>;
> >>   	
> >>   	};
> >> 
> >> diff --git a/arch/arm/boot/dts/rk3288-evb.dtsi
> >> b/arch/arm/boot/dts/rk3288-evb.dtsi index 4faabdb..0c91858 100644
> >> --- a/arch/arm/boot/dts/rk3288-evb.dtsi
> >> +++ b/arch/arm/boot/dts/rk3288-evb.dtsi
> >> @@ -47,7 +47,7 @@
> >> 
> >>   		reg = <0x0 0x80000000>;
> >>   	
> >>   	};
> >> 
> >> -	backlight {
> >> +	backlight: backlight {
> >> 
> >>   		compatible = "pwm-backlight";
> >>   		brightness-levels = <
> >>   		
> >>   			  0   1   2   3   4   5   6   7
> >> 
> >> @@ -183,6 +183,16 @@
> >> 
> >>   	status = "okay";
> >>   
> >>   };
> >> 
> >> +&mipi_dsi {
> >> +	status = "okay";
> >> +	panel {
> >> +		compatible ="boe,tv080wum-nl0";
> >> +		reg = <0>;
> >> +		backlight = <&backlight>;
> >> +		status = "okay";
> > 
> > in the evb-schematics I see, vcc_lcd as supply for the panel.
> > 
> > So I'd think the panel node here should have a
> > 
> > 	power-supply = <&vcc_lcd>;
> > 
> > instead of having the always-on above?
> > 
> > 
> > Thanks
> > Heiko
> > 
> >> +	};
> >> +};
> >> +
> >> 
> >>   &sdmmc {
> >>   
> >>   	bus-width = <4>;
> >>   	cap-mmc-highspeed;