[RFC PATCH] mmc: host: sdhci-iproc: implement the .hw_reset callback

[Meagan Lloyd]

On 4/13/2026 10:43 AM, Florian Fainelli wrote:
> On 4/13/26 10:38, Meagan Lloyd wrote:
>>
>> On 3/27/2026 3:21 PM, Meagan Lloyd wrote:
>>> Implement the .hw_reset callback so that the eMMC can be reset as
>>> needed
>>> given cap-mmc-hw-reset is set in the devicetree and the
>>> functionality is
>>> enabled on the eMMC.
>>>
>>> Signed-off-by: Meagan Lloyd <meaganlloyd at linux.microsoft.com>
>>> ---
>>>
>>> SDHCI_POWER_CONTROL[4] (SD Host Controller Standard) has been
>>> repurposed
>>> on my Broadcomm processor to be eMMC hardware reset
>>> (SDIO*_eMMCSDXC_CTRL[12], HRESET).
>>>
>>> Can you confirm this repurposed bit is consistent across the Broadcomm
>>> iProc processors and thus the .hw_reset callback can be uniformly
>>> applied in this driver?
>>
>> Hi Ray & Scott,
>>
>> I hope you're doing well. This bit looks to have been repurposed from
>> the SD Host Controller Standard's VDD2 Power Control to being used for
>> toggling the hardware reset signal to eMMCs. Can you verify that it
>> applies across the iProc processors so that I may finalize this patch?
>
> Which iProc process are you using? If you are not sure this applies
> broadly, can you at least make it specific to the SoC you are using? 
Yes, if it comes to that I can. I think it's overkill to roll a new
compat string/associated structures over this small change, hence
checking with Broadcomm iProc maintainers on this thread.