Re: [PATCH v24 10/15] mmc: renesas_sdhi: Add write32_hook for CTL_SD_CARD_CLK_CTL register writes

[Wolfram Sang <wsa+renesas@sang-engineering.com>]

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On Thu, Aug 20, 2026 at 06:16:40PM +0100, Biju wrote:
> From: Biju Das <biju.das.jz@bp.renesas.com>
> 
> Add a write32_hook, analogous to the existing write16_hook, so that
> sd_ctrl_write32() can wait for the SD bus to become idle before
> certain 32-bit register writes.
> 
> renesas_sdhi_write32_hook() checks whether the target register is
> CTL_SD_CARD_CLK_CTL and, if so, waits for TMIO_STAT_SCLKDIVEN via
> renesas_sdhi_wait_idle() before the write proceeds. Other registers
> are unaffected. As with write16_hook, the write is skipped if the
> hook returns a non-zero error.

While technically correct, the commit message is totally not helpful
because it misses to say WHY the change is needed. It only says WHAT is
done but I can see that. G3L exceeds the 16-bit width, this is why we
need to change the code here. I know you use AI to assist with commit
messages but please keep a suspicious eye on the results.

> +	host->write32_hook = renesas_sdhi_write32_hook;

Have you checked that all SoCs handled by this driver support 32-bit
access to this register?


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