從我的 iPad 傳送 Thank you > Andrzej Hajda <a.hajda@xxxxxxxxxxx> 於 2016年9月1日 下午3:04 寫道: > >> On 08/31/2016 07:55 PM, ayaka wrote: >> >>> On 08/31/2016 08:30 PM, Andrzej Hajda wrote: >>> Hi, >>> >>> >>>> On 08/30/2016 12:50 AM, Randy Li wrote: >>>> It is actually a lvds panel connected through a rga-lvds bridge. >>>> But I really have no idea about what does a port mean in fimd node. >>>> >>>> Also how should I configure this panel size? I think the i2c found >>>> on the panel schematic, but it more likely to be used a touch screen >>>> touth. Also the touch screen is not supported in currently driver. >>>> >>>> Signed-off-by: Randy Li <ayaka@xxxxxxxxxxx> >>>> --- >>>> arch/arm/boot/dts/exynos4412-itop-elite.dts | 35 ++++++++++++++++++++++++++--- >>>> 1 file changed, 32 insertions(+), 3 deletions(-) >>>> >>>> diff --git a/arch/arm/boot/dts/exynos4412-itop-elite.dts b/arch/arm/boot/dts/exynos4412-itop-elite.dts >>>> index e1cda54..2d67385 100644 >>>> --- a/arch/arm/boot/dts/exynos4412-itop-elite.dts >>>> +++ b/arch/arm/boot/dts/exynos4412-itop-elite.dts >>>> @@ -139,6 +139,20 @@ >>>> assigned-clocks = <&clock CLK_MOUT_CAM0>; >>>> assigned-clock-parents = <&clock CLK_XUSBXTI>; >>>> }; >>>> + >>>> + vcc_sys_lcd: sys-lcd { >>>> + compatible = "regulator-fixed"; >>>> + regulator-name = "vcc_5v"; >>>> + regulator-min-microvolt = <5000000>; >>>> + regulator-max-microvolt = <5000000>; >>>> + gpio = <&gpl0 4 GPIO_ACTIVE_HIGH>; >>>> + }; >>>> + >>>> + panel: panel { >>>> + ddc-i2c-bus = <&i2c_3>; >>>> + power-supply = <&vcc_sys_lcd>; >>>> + enable-gpios = <&gpl0 2 GPIO_ACTIVE_HIGH>; >>>> + }; >>> Panel has no compatible string, which driver will handle this node? >> The problem is that, it is panel not supported by kernel. > > For simple panel you can take a look at [1][2]. Ie. if the panel needs > only power supply and enable gpio, you just need to add few lines to [2]. But I still don't know which compatible string I should use, "simple-dpi" ? > > > [1]: Documentation/devicetree/bindings/display/panel/simple-panel.txt > [2]: drivers/gpu/drm/panel/panel-simple.c > >> Is it possible >> to support without adding a new driver for it ? I know there is a >> simple-dpi for MIPI, but what is for parallel video or lvds? > > simple-dpi is just parallel output. LVDS is not supported by Exynos4412 but > boards usually have RGB/LVDS bridge for such panels, I have no access to > itop > board schematics, but I suppose it has such bridge. LVDS bridges often > do not > need Linux driver, so from developer point of view LVDS panels with such > bridge Yes it is. > are handled the same way as RGB panels. Example fimd bindings for RGB panels > are in [3]. > > [3]: arch/arm/boot/dts/exynos4210-universal_c210.dts > Would it appear as a frame buffer device in Linux ? Regard of display timings, I could solve it later. If the frame buffer node is created, I could know I have a way to test. >>> Regards >>> Andrzej >> The other problem is that I don't how to configure the display-times, >> the datasheet for CLAA070WP03XG only talk about total time, active time >> and blank time for both Horizontal an Vertical time. Does it mean the >> front-porch and sync-len for horizontal and vertical are zero ? > > You can look at vendor's code. It is a very old kernel. But it seems that they didn't configure the fimd but the frame buffer. > Or just experiment with different values. > The equation is: total=active+back_porch+blank+front_porch. > So if htotal=864, hactive=800, hblank=64, then hporches are 0. > In case of vtotal=1288, vactive=1200, vblank=8 you have left 80 for porches, > you can try to split them equally for front and back for starters. But timings diagram in data sheet doesn't look like that, I have asked the vendor for some help, I hope I could get a reply from the vendor. > > Regards > Andrzej > >> >> + ports { >> + #address-cells = <1>; >> + #size-cells = <0>; >> + port@3 { >> + reg = <3>; >> + rga_lvds: endpoint { >> + remote-endpoint = <&panel>; >> + }; >> + }; >> + }; >> + >> + panel: panel@0 { >> + compatible = "panel-simple"; >> + >> + power-supply = <&vcc_sys_lcd>; >> + enable-gpios = <&gpl0 2 GPIO_ACTIVE_HIGH>; >> + display-timings { >> + timing-0 { >> + clock-frequency = <66770000>; >> + hactive = <800>; >> + vactive = <1280>; >> + hfront-porch = <0>; >> + hback-porch = <64>; >> + hsync-len = <0>; >> + vfront-porch = <0>; >> + vback-porch = <8>; >> + vsync-len = <0>; >> + }; >> + }; >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> >> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html