Re: [PATCH RFC PoC 0/2] platform: different approach to early platform drivers

From: Rich Felker
Date: Thu Apr 26 2018 - 13:45:40 EST

On Thu, Apr 26, 2018 at 05:29:18PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
> This is a follow to my series[1] the aim of which was to introduce device tree
> support for early platform devices.
> It was received rather negatively. Aside from using device tree to pass
> implementation specific details to the system, two important concerns were
> raised: no probe deferral support and the fact that currently the early devices
> never get converted to actual platform drivers. This series is a
> proof-of-concept that's trying to address those issues.
> The only user of the current version of early platform drivers is the SuperH
> architecture. If this series eventually gets merged, we could simply replace
> the other solution.

Looking at a quick output of:

grep -r -A10 early_devices[[] arch/sh/kernel/

it looks like all of the existing early platform devices are serial
ports, clocks, and clocksources. The switch to device tree should pick
them all up from CLK_OF_DECLARE, TIMER_OF_DECLARE, and
EARLYCON_DECLARE. Until that's complete, the existing code works
as-is. I don't see what problem you're trying to solve.

FYI I'm (sometimes-somewhat-absent) arch/sh co-maintainer.