[PATCH] mmc: sdhci-brcmstb: don't log an error for missing BOOT registers

[Kamal Dasu]

On Thu, Oct 8, 2026 at 8:32 PM Karl Mehltretter <kmehltretter at gmail.com> wrote:
>
> The BOOT register range is optional: the probe function ignores a
> failure to map it and the suspend/resume code checks for NULL. It is
> mapped with devm_platform_get_and_ioremap_resource(), though, which
> calls dev_err_probe() when the resource does not exist. Every
> non-removable host without a third reg entry therefore logs an error
> at probe time and then works normally.
>
> The binding only describes the "host" and "cfg" ranges, so this is the
> case for the in-tree users. On the Raspberry Pi 5 family (BCM2712),
> where the SDIO host of the Wi-Fi module is non-removable, each boot
> prints:
>
>   sdhci-brcmstb 1001100000.mmc: error -EINVAL: invalid resource (null)
>
> Look the resource up with platform_get_resource() first and map it only
> when it is present. Hosts that do have the range are mapped by the same
> two calls as before.
>
> Fixes: b7e614802e3f ("mmc: sdhci-brcmstb: save and restore registers during PM")
> Assisted-by: LLM
> Signed-off-by: Karl Mehltretter <kmehltretter at gmail.com>

LGTM

Reviewed-by: Kamal Dasu <kamal.dasu at broadcom.com>
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