On Wed, Sep 05, 2018 at 03:46:41PM +0800, Icenowy Zheng wrote: > > > 于 2018年9月5日 GMT+08:00 下午3:14:35, Maxime Ripard <maxime.ripard@xxxxxxxxxxx> 写到: > >On Mon, Sep 03, 2018 at 09:34:32PM +0800, Icenowy Zheng wrote: > >> By experiment, the A64 HDMi PHY doesn't support the PLL-VIDEO mux > >> introduced in R40, although it has two PLL-VIDEOs. > >> > >> Change the A64 HDMI PHY binding to R40 one. > >> > >> This binding is introduced in v4.19, which is still in RC stage, so > >we > >> have change to fix it. > >> > >> Signed-off-by: Icenowy Zheng <icenowy@xxxxxxx> > > > >That doesn't make much sense. The A64 doesn't have any particular > >reason to behave like the R40, and the R40 can definitely use a > >different compatible if it has a different behaviour. But I don't see > >*why* the A64 not behaving like the R40 is a justification to remove > >the A64 compatible. Especially when the R40 was released later. > > > >Add a new compatible, and leave the A64 compatible alone. > > But the behavior of A64 compatible will change from double > PLL to single PLL, because the A64 HDMI PHY is proven > to have no double PLL. > > Should I then change the A64 compatible behavior and import R40 > compatible at the same time? I don't see why you should do both at the same time. Fix the A64, and add the support for the R40, those are two orthogonal changes. > In addition maybe I can just drop A64 compatible, and let A64 > use H3 one. No, that break the backward compatibility. Maxime -- Maxime Ripard, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
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