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On > which platform can that happen ? None that I can name: the nodes exist only on Rockchip and i.MX8 boards, and those select PM. The patch came out of the rkvdec thread, where Nicolas pointed out that with PM=n the first MMIO access can hang and asked to check similar drivers [1]; rkisp1 and rga had the same pattern. If that case is not worth guarding, I'll drop it. [1] https://lore.kernel.org/r/8aafdbbf04a0d939c6b4d7d5577d97bb58d1c439.camel@collabora.com