linux-kernel - [PATCH 0/7] component: Make into an aggregate bus

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Date:   Wed, 19 May 2021 17:25:12 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Saravana Kannan <saravanak@...gle.com>
Subject: [PATCH 0/7] component: Make into an aggregate bus

This series is from discussion we had on reordering the device lists for
drm shutdown paths[1]. I've introduced an 'aggregate' bus that we put
the aggregate device onto and then we probe the device once all the
components are probed and call component_add(). The probe/remove hooks
are where the bind/unbind calls go, and then a shutdown hook is added
that can be used to shutdown the drm display pipeline at the right time.

This works for me on my sc7180 board, but I'm currently struggling with
the last patch where we migrate the msm driver. It runs into a runtime
PM problem where the parent device isn't runtime PM enabled yet. I'm
still trying to figure out a clean solution there. Moving runtime PM
around breaks boot and I think that's because the power domain is off.

Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Rob Clark <robdclark@...il.com>
Cc: Russell King <rmk+kernel@....linux.org.uk>
Cc: Saravana Kannan <saravanak@...gle.com>

[1] https://lore.kernel.org/r/20210508074118.1621729-1-swboyd@chromium.org

Stephen Boyd (7):
  component: Drop 'dev' argument to component_match_realloc()
  component: Rename 'dev' to 'parent'
  component: Introduce struct aggregate_device
  component: Introduce the aggregate bus_type
  component: Use dev.parent instead of adev->parent
  component: Move struct aggregate_device out to header file
  drm/msm: Migrate to aggregate driver

 drivers/base/component.c      | 614 ++++++++++++++++++++++------------
 drivers/gpu/drm/msm/msm_drv.c |  47 +--
 include/linux/component.h     |  73 +++-
 3 files changed, 487 insertions(+), 247 deletions(-)

base-commit: 6efb943b8616ec53a5e444193dccf1af9ad627b5
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