Re: [PATCH 7/7] arm64: dts: renesas: r8a779md: Add support for R-Car M3Le R8A779MD Geist

Marek Vasut
2026-05-04T22:54:02Z

On 5/4/26 11:24 AM, Geert Uytterhoeven wrote:

Hello Geert,

>>> Do we need these two? We don't have them in e.g.
>>> arch/arm64/boot/dts/renesas/salvator-common.dtsi
>>
>> I believe we should add them, the KSZ9031 PHY does require 100us delay
>> after reset is deasserted and before MDIO access is possible:
>>
>> https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/KSZ9031RNX-Data-Sheet-DS00002117.pdf
>>
>> FIGURE 7-5: POWER-UP/POWER-DOWN/RESET TIMING
>>
>> "
>> Note 2: After the de-assertion of reset, wait a minimum of 100 µs before
>> starting programming on the MIIM (MDC/MDIO)
>> interface
>> "
>
> OK. So please add it to the other boards, too.

Will do.

>> [...]
>>
>>>> + pwm2_pins: pwm2 {
>>>> + groups = "pwm2_a";
>>>> + function = "pwm2";
>>>> + };
>>>
>>> What is pwm2 used for?
>>
>> The signal is accessible on the EXIO connector D (LBSC) .
>> It is up to user to use the pin for their purposes.
>
> Usually we do not enable support for random user wirings on EXIO connectors.
I'll remove that in V3, thanks !