Hi, On Wed, Nov 29, 2017 at 6:27 PM, Chris Zhong <zyw@xxxxxxxxxxxxxx> wrote: > Hi Doug > > Thank you for mentioning this patch. > > I think the focus of the discussion is: can we put the grf control bit to > dts. > > The RK3399 has 2 Type-C phy, but only one DP controller, this "uphy_dp_sel" > > can help to switch these 2 phy. So I think this bit can be considered as a > part of > > Type-C phy, these 2 phy have different bits, just similar to other bits > (such as "pipe-status"). > > Put them to DTS file might be a accepted practice. I guess the first step would be finding the person to make a decision. Is that Heiko? Olof? Kishon? Rob?. As I see it there are a few options: 1. Land this series as-is. This makes the new bit work just like all the other ones next to it. If anyone happens to try to use an old device tree on a new kernel they'll break. Seems rather unlikely given that the whole type C PHY is not really fully functional upstream, but technically this is a no-no from a device tree perspective. 2. Change the series to make this property optional. If it's not there then the code behaves like it always did. This would address the "compatibility" problem but likely wouldn't actually help any real people, and it would be extra work. 3. Redo the driver to deprecate all the old offsets / bits and just put the table in the driver, keyed off the compatible string and base address if the IO memory. I can't make this decision. It's up to those folks who would be landing the patch and I'd be happy with any of them. What I'm less happy with, however, is the indecision preventing forward progress. We should pick one of the above things and land it. My own personal bias is #1: just land the series. No real people will be hurt and it's just adding another property that matches the ones next to it. >From a long term perspective (AKA how I'd write the next driver like this) I personally lean towards to "tables in the driver, not in the device tree" but quite honestly I'm happy to take whatever direction the maintainers give. -Doug -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
