Re: [PATCH] arm64: dts: ti: k3-am62a7-sk: Fix pinmux for pin M19 used by sdhci1

[Vignesh Raghavendra]

On 04/03/26 10:24, Siddharth Vadapalli wrote:
> On 03/03/26 22:06, Judith Mendez wrote:
>> Hi Siddharth,
>>
>> On 2/12/26 7:06 AM, Siddharth Vadapalli wrote:
>>> According to the datasheet for the AM62Ax SoC [0], pin M19 has the
>>> address
>>> 0x000F40A8. Therefore, the offset to be passed to the AM62AX_IOPAD
>>> macro is
>>> 0xa8 and not 0x07c. With the existing incorrect offset, the following
>>> error
>>> is seen when Linux boots:
>>>     fa00000.mmc: deferred probe pending: platform: supplier
>>> regulator-5 not ready
>>> with the SD Card being unusable and the boot process halting due to
>>> the root
>>> filesystem in the SD Card being inaccessible.
>>>
>>> Hence, fix it.
>>>
>>> [0]: https://www.ti.com/lit/ds/symlink/am62a7.pdf
>>>
>>> Fixes: 8f023012eb4a ("arm64: dts: ti: k3-am62a: Enable UHS mode
>>> support for SD cards")
>>> Cc: <stable@xxxxxxxxxxxxxxx>
>>> Signed-off-by: Siddharth Vadapalli <s-vadapalli@xxxxxx>
>>> ---
>>>
>>> Hello,
>>>
>>> This patch is based on commit
>>> 37a93dd5c49b Merge tag 'net-next-7.0' of git://git.kernel.org/pub/
>>> scm/ linux/kernel/git/netdev/net-next
>>> of Mainline Linux.
>>>
>>> Regards,
>>> Siddharth.
>>>
>>>   arch/arm64/boot/dts/ti/k3-am62a7-sk.dts | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts b/arch/arm64/
>>> boot/ dts/ti/k3-am62a7-sk.dts
>>> index e99bdbc2e0cb..9cfe7e7b317b 100644
>>> --- a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
>>> +++ b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
>>> @@ -398,7 +398,7 @@ AM62AX_IOPAD(0x01d4, PIN_INPUT, 7) /* (C15)
>>> UART0_RTSn.GPIO1_23 */
>>>       vddshv_sdio_pins_default: vddshv-sdio-default-pins {
>>>           pinctrl-single,pins = <
>>> -            AM62AX_IOPAD(0x07c, PIN_OUTPUT, 7) /* (M19)
>>> GPMC0_CLK.GPIO0_31 */
>>> +            AM62AX_IOPAD(0x0a8, PIN_OUTPUT, 7) /* (M19)
>>> GPMC0_CLK.GPIO0_31 */
>>
>> What! I don't think this is right.
>>
>> Looking at device tree, regulator-5 is using main_gpio0 31 to control SD
>> ENA with PMIC. Which is GPMC0_CLK (N22 pad) and VSEL_SD_SOC. Which is
>> 0x000F407C address in the device datasheet. So as far as I can see, the
>> original address is correct and just the (M19) name is wrong. Did you
>> test this patch to see if that fixed the failure?
> Yes, without this patch I saw the following:
> [    2.108345] Waiting for root device PARTUUID=076c4a2a-02...
> [   12.261669] platform fa00000.mmc: deferred probe pending: platform:
> supplier regulator-5
> 
> Since the pin was named 'M19' in the comment, I corrected the offset to
> match that of M19 and the issue was fixed. So it seems that although it
> fixed the issue, it isn't really a fix.
> 

Refer to the schematics and not datasheet for pin routing. Please submit
patch fixing the comment to say N22

> Regards,
> Siddharth.

-- 
Regards
Vignesh
https://ti.com/opensource