[PATCH v2 7/9] mci: add PCI SDHCI controller support

[Ahmad Fatoum]

Hi,

On 6/29/26 11:04 AM, Sascha Hauer wrote:
> On 2026-06-29 10:51, Ahmad Fatoum wrote:
>> Hello Sascha,
>>
>> On 6/29/26 10:47 AM, Sascha Hauer wrote:
>>> On 2026-06-26 18:19, Ahmad Fatoum wrote:
>>>> QEMU can expose eMMC through the class-compliant sdhci-pci device, but
>>>> barebox only had platform SDHCI glue. Add a PCI host driver that maps BAR0,
>>>> enables bus mastering, initializes the SDHCI core and registers an MCI host.
>>>>
>>>> This is intentionally small and PIO-based, which is enough for the QEMU RPMB
>>>> test environment while reusing the common SDHCI helpers.
>>>
>>> Is this comment wrong? The driver depends on HAS_DMA and even calls
>>> sdhci_setup_adma().
>>
>> Yes, I had problems getting RPMB access to work with PIO and ADMA fixed
>> that and I had not dug deeper.
>>
>> Can you remove that paragraph when applying?
>>>> index 4413fd1655aa..d6746fbec28f 100644
>>>> --- a/drivers/mci/mci-core.c
>>>> +++ b/drivers/mci/mci-core.c
>>>> @@ -2942,7 +2942,7 @@ static struct device_node *mci_get_partition_node(struct device_node *hwnode,
>>>>  	struct device_node *np;
>>>>  	char partnodename[sizeof("bootx-partitions")];
>>>>  
>>>> -	if (index > 8)
>>>> +	if (!hwnode || index > 8)
>>>>  		return NULL;
>>>
>>> Should this be an extra patch?
>>
>> This is the first non-DT instantiated device and thus there is no DT
>> node. I can split this off if you like. The rest of the file seems to
>> handle non-existence of a DT node just fine.
> 
> Back in the old days non-DT instantiated devices were the normal case,
> so 15cc1fa00c ("mci: parse upstream boot/gp partition binding") might
> have introduced a regression, so I would prefer to have this as a
> separate patch.

Fair enough.

Should I resend all or just this patch?

Cheers,
Ahmad

> 
> Sascha
> 
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