Re: [PATCH] mfd: intel_soc_pmic_chtdc_ti: Set use_single_read regmap_config flag

[Hans de Goede <hansg@kernel.org>]

Hi,

On 4-Aug-25 10:57 AM, Andy Shevchenko wrote:
> On Mon, Aug 4, 2025 at 10:51 AM Hans de Goede <hansg@kernel.org> wrote:
>> On 4-Aug-25 10:47 AM, Andy Shevchenko wrote:
>>> On Mon, Aug 4, 2025 at 10:34 AM Hans de Goede <hansg@kernel.org> wrote:
> 
> ...
> 
>>>> +       /* Reading multiple registers at once is not supported */
>>>> +       .use_single_read = true,
>>>
>>> By HW or by problem in regmap as being suggested here:
>>> https://lore.kernel.org/linux-gpio/CALNFmy1ZRqHz6_DD_2qamm-iLQ51AOFQH=ahCWRN7SAk3pfZ_A@mail.gmail.com/
>>> ?
>>
>> This is a hw limitation. I tried with i2ctransfer to directly
>> access the chip and it returns invalid values (1) after
>> the first byte read.
> 
>> 1) I don't remember if it was 0, 0xff or repeating
>> of the first byte. But it definitely did not work.
> 
> Perhaps elaborate the above in the comment, by at least putting
> keyword HW there?

Ok, I've just send out a v2 clarifying the comment.

Regards,

Hans