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

[Ahmad Fatoum]

Hello Chris,

On 30.03.24 16:34, Chris Morgan wrote:
> 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.

Thanks for the info.

AFAICS, it should be possible to get a console by changing the pinmux
setting on the Game TF-Card:

  SDMMC1_D0/UART6_RX_M0/GPIO2_A3_u
  SDMMC1_D1/UART6_TX_M0/GPIO2_A4_u
  SDMMC1_D2/UART7_RX_M0/GPIO2_A5_u
  SDMMC1_D3/UART7_TX_M0/GPIO2_A6_u
  SDMMC1_CMD/UART9_RX_M0/GPIO2_A7_u
  SDMMC1_CLK/UART9_TX_M0/GPIO2_B0_d

I will give that a try.

Cheers,
Ahmad

> 
> 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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>>
> 

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
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