linux-kernel - [PATCH v2 0/5] PM: domains: Add helpers for multi PM domains to avoid open-coding

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Date: Fri,  5 Jan 2024 17:00:58 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: "Rafael J . Wysocki" <rafael@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-pm@...r.kernel.org
Cc: Ulf Hansson <ulf.hansson@...aro.org>,
	Sudeep Holla <sudeep.holla@....com>,
	Kevin Hilman <khilman@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Nikunj Kela <nkela@...cinc.com>,
	Prasad Sodagudi <psodagud@...cinc.com>,
	Stephan Gerhold <stephan@...hold.net>,
	Ben Horgan <Ben.Horgan@....com>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-remoteproc@...r.kernel.org,
	linux-media@...r.kernel.org
Subject: [PATCH v2 0/5] PM: domains: Add helpers for multi PM domains to avoid open-coding

Updates in v2:
	- Ccing Daniel Baluta and Iuliana Prodan the NXP remoteproc patches to
	requests help with testing.
	- Fixed NULL pointer bug in patch1, pointed out by Nikunj.
	- Added some tested/reviewed-by tags.

Attaching/detaching of a device to multiple PM domains has started to become a
common operation for many drivers, typically during ->probe() and ->remove().
In most cases, this has lead to lots of boilerplate code in the drivers.

This series adds a pair of helper functions to manage the attach/detach of a
device to its multiple PM domains. Moreover, a couple of drivers have been
converted to use the new helpers as a proof of concept.

Note 1)
The changes in the drivers have only been compile tested, while the helpers
have been tested along with a couple of local dummy drivers that I have hacked
up to model both genpd providers and genpd consumers.

Note 2)
I was struggling to make up mind if we should have a separate helper to attach
all available power-domains described in DT, rather than providing "NULL" to the
dev_pm_domain_attach_list(). I decided not to, but please let me know if you
prefer the other option.

Note 3)
For OPP integration, as a follow up I am striving to make the
dev_pm_opp_attach_genpd() redundant. Instead I think we should move towards
using dev_pm_opp_set_config()->_opp_set_required_devs(), which would allow us to
use the helpers that $subject series is adding.

Kind regards
Ulf Hansson

Ulf Hansson (5):
  PM: domains: Add helper functions to attach/detach multiple PM domains
  remoteproc: imx_dsp_rproc: Convert to
    dev_pm_domain_attach|detach_list()
  remoteproc: imx_rproc: Convert to dev_pm_domain_attach|detach_list()
  remoteproc: qcom_q6v5_adsp: Convert to
    dev_pm_domain_attach|detach_list()
  media: venus: Convert to dev_pm_domain_attach|detach_list() for vcodec

 drivers/base/power/common.c                   | 134 +++++++++++++++
 drivers/media/platform/qcom/venus/core.c      |  12 +-
 drivers/media/platform/qcom/venus/core.h      |   7 +-
 .../media/platform/qcom/venus/pm_helpers.c    |  48 ++----
 drivers/remoteproc/imx_dsp_rproc.c            |  82 +--------
 drivers/remoteproc/imx_rproc.c                |  73 +-------
 drivers/remoteproc/qcom_q6v5_adsp.c           | 160 ++++++++----------
 include/linux/pm_domain.h                     |  38 +++++
 8 files changed, 289 insertions(+), 265 deletions(-)

-- 
2.34.1