[PATCH 3/3] arm64: dts: rockchip: Remove UART2 from RGB30

[Chris Morgan]

On Sat, Mar 30, 2024 at 02:13:05PM +0100, Ahmad Fatoum wrote:
> Hello Chris,
> 
> On 18.10.23 17:33, Chris Morgan wrote:
> > From: Chris Morgan <macromorgan at hotmail.com>
> > 
> > The Powkiddy RGB30 has no onboard UART header, so remove the reference
> > to it in the device tree. This was left on by mistake in the initial
> > commit.
> 
> Do you know if the UART is perhaps available over testpoints?

There is not one as best I can tell on either the RGB30 or RK2023. The
Powkiddy X55 does have UART, however. I was able to exploit the fact
that the RGB30 is extremely similar to all of the Anbernic devices
(such as the RG353 series) for the purposes of low-level development.
Once I got a network connection I performed the rest of development
over SSH, but prior to that I just developed on a different device.

Thank you,
Chris.

> 
> If yes, having a DT-overlay upstream enabling it along with documentation could be useful.
> If not, how do you do low-level debugging on the RBG30 in absence of the serial console?
> 
> Thanks,
> Ahmad 
> 
> > 
> > Signed-off-by: Chris Morgan <macromorgan at hotmail.com>
> > ---
> >  arch/arm64/boot/dts/rockchip/rk3566-powkiddy-rgb30.dts | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3566-powkiddy-rgb30.dts b/arch/arm64/boot/dts/rockchip/rk3566-powkiddy-rgb30.dts
> > index 3ebc21608213..1ead3c5c24b3 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3566-powkiddy-rgb30.dts
> > +++ b/arch/arm64/boot/dts/rockchip/rk3566-powkiddy-rgb30.dts
> > @@ -64,6 +64,10 @@ simple-audio-card,cpu {
> >  
> >  /delete-node/ &adc_keys;
> >  
> > +&chosen {
> > +	/delete-property/ stdout-path;
> > +};
> > +
> >  &cru {
> >  	assigned-clocks = <&pmucru CLK_RTC_32K>, <&cru PLL_GPLL>,
> >  			  <&pmucru PLL_PPLL>, <&cru PLL_VPLL>;
> > @@ -149,4 +153,9 @@ rk817_charger: charger {
> >  	};
> >  };
> >  
> > +/* There is no UART header visible on the board for this device. */
> > +&uart2 {
> > +	status = "disabled";
> > +};
> > +
> >  /delete-node/ &vibrator;
> 
> -- 
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