rk3568-pinctrl for LCD RGB666/RGB656

[Andy Yan]

Hi Michael:

On 5/27/22 20:46, Michael Riesch wrote:
> Hello Liang,
>
> According to the RK3568 TRM the Video Output Processor (VOP2) is able to
> emit parallel RGB data to LCDs in 24-bit (888), 18-bit (666) and 16-bit
> (565) format. Based on this I would have expected that
> rk3568-pinctrl.dtsi specifies one group of control pins (clock, hsync,
> vsync, data enable) and three groups of data pins (with 24, 18, 16 pins,
> respectively). Does this sound reasonable?
>
> However, there is only one group with the control pins and the data pins
> D0 - D23. I cannot tell which pins have to be assigned to the different
> groups. They are mapped 1:1 to Rockchip pin names (e.g., D0 is mapped to
> GPIO2_PD0) but it is not clear which function (channel, bit) each pin
> has in this context. Could you please elaborate on the mapping of the D0
> - D23 pins in the different operating modes?


For 18-bit(RGB666),

R0~R5 map to D18~D23

G0~G5 map to D10~D15

B0~B5 map to D2~D7


for 16-bit(RGB565)

R0~R4 map to D17~D23

G0~G5 map to D10~D15

B0~B4 map to D3~D7

> Thanks and regards,
> Michael
>
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