[PATCH 2/3] nvmem: mtk-efuse: add support for 32-bit aligned reads

[Roman Vivchar]

On Monday, July 20th, 2026 at 3:48 PM, AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com> wrote:

> On 7/15/26 16:27, Roman Vivchar via B4 Relay wrote:

...
 
> it's easier at this point if you simply do
> 
> 	if (pdata->needs_aligned_read) {
> 		econfig.stride = 4;
> 		econfig.reg_read = mtk_reg_read_aligned;
> 	} else {
> 		econfig.stride = 1;
> 		econfig.reg_read = mtk_reg_read;
> 	}
> 
> and you avoid touching mtk_reg_read entirely.

stride = 4 means we can't do something like reg = <0x1 0x1>;
For example, CPU speedbin is sitting at 0x181, but we can model that as
0x180.
cpu_speedbin: cpu-speedbin at 180 {
    /* This is technically reg = <0x181 0x1> and bits = <0 2> */
    reg = <0x180 0x4>;
    bits = <8 2>;
};

I'm not sure what are mediatek preferences in the devicetree since
things change quite frequently... Downstream never triggers this hw bug
because it uses readl everywhere for each efuse.

I would keep the stride = 1 so we don't need workarounds in the DT, but
the reg_read indeed sounds better :)

Let me know if you have any objections.

Best regards,
Roman