On Mon, Oct 14, 2013 at 12:05:18PM -0600, Stephen Warren wrote: > On 10/12/2013 05:32 AM, Thierry Reding wrote: > > On Fri, Oct 11, 2013 at 04:14:27PM -0600, Stephen Warren wrote: > >> On 10/07/2013 02:34 AM, Thierry Reding wrote: > >>> From: Mikko Perttunen <mperttunen@xxxxxxxxxx> > >>> > >>> The Tegra114 display controller is backwards-compatible with > >>> previous generations of the Tegra SoC. No code changes are > >>> required. > >> > >> If the HW is backwards-compatible, then there's no need to add > >> extra compatible values to the driver; just write the following > >> in the DT, and it'll just work: > >> > >> compatible = "nvidia,tegra114-dc", "nvidia,tegra30-dc"; > > > > One reason why I thought it might be useful to still include this, > > even though unnecessary, was to match it to the host1x_drm_subdevs > > table. We can probably remove the entry from there as well, > > though. > > > > As far as I can tell, the same holds for Tegra30, which is also > > backwards compatible with Tegra20 but the DTS doesn't contain the > > Tegra20 compatible. So to keep ABI compatibility we'll need to keep > > the nvidia,tegra30-dc in the driver's match tables, but I could > > still update the DTS to include the nvidia,tegra20-dc for > > correctness. > > > > Does that make sense? > > Yes, fixing the Tegra30 .dtsi file sounds like a good idea. Done. Thierry
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