Re: [PATCH v2 5/5] arm64: dts: qcom: qcs8550: add QCS8550 RB5Gen2 board support

[Konrad Dybcio]

On 4/8/26 2:35 PM, Neil Armstrong wrote:
> On 4/8/26 11:57, Konrad Dybcio wrote:
>> On 4/7/26 5:46 PM, Joe Sandom via B4 Relay wrote:
>>> From: Joe Sandom <jsandom@xxxxxxxx>
>>>
>>> The RB5gen2 is an embedded development platform for the
>>> QCS8550, based on the Snapdragon 8 Gen 2 SoC (SM8550).
>>
>> [...]
>>
>>
>>> +    /* Lontium LT9611UXC fails FW upgrade and has timeouts with geni-i2c */
>>> +    /* Workaround is to use bit-banged I2C */
>>
>> Interesting.. I was under the impression that it was only an issue on
>> RB1 and RB2 boards.. perhaps we're missing some magic register write..
> 
> On the SM8650-HDK, the HDMI i2c is shared with the battmgr in ADSP, causing a lot
> of issues... the only solution is [1] to declare the bus shared and use GPI DMA.
> I assume it's the same here.

Ohhhh hmm.. doesn't seem to be the case on RB1 but I wouldn't
completely rule that out either (maybe something is poking at the
bus regardless of its usefulness..)

> Sharing the same bus between APPS and ADSP is a weird feat... It seems that having
> 26 i2c busses and 212 gpios available on the system is not enough.

That's only the tip of the iceberg..

Konrad