Re: [PATCH 00/13] dtb: amd: Miscelleneous Updates for AMD Seattle DTS

From: Suravee Suthikulanit
Date: Thu Jan 28 2016 - 17:20:52 EST

Hi Olof,

On 1/28/2016 3:39 PM, Olof Johansson wrote:
Hi Suravee,

On Wed, Jan 27, 2016 at 1:11 PM, Suravee Suthikulpanit
<Suravee.Suthikulpanit@xxxxxxx> wrote:
From: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>

This patch series contains several updates for the AMD Seattle SOC DTS files.
It also adds new board files for newer Overdrive and Linaro 96boards (Husky)

My Overdrive comes with DT provided by firmware, so there's no need to
have a in-kernel-tree DT source.

You are correct that the FW comes with DT, and in typical case, you wouldn't need this.

Are you aware of other reasons to have it here? I just foresee
divergence and conflicts between the two. It was quite obvious before
this update when the FW-provided DT was a lot more complete than what
we had in the kernel tree.

However, there are still new/updated drivers being developed, and sometimes requires new/changes in DT binding. So, the DT that comes with the FW can get out of date, and will lack the support for new drivers.

Certain version of the FW allows overriding the DT that comes with the FW. So, we are providing the in-kernel DT to allow developers to provide the updated device tree for newer kernels. This patch series is bringing the in-kernel DT closer to what the latest FW is providing to avoid potential conflicts.