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Date: Tue, 21 Apr 2020 17:18:45 +0300 From: Daniel Baluta <daniel.baluta@...il.com> To: Ulf Hansson <ulf.hansson@...aro.org> Cc: Daniel Baluta <daniel.baluta@....nxp.com>, Aisheng Dong <aisheng.dong@....com>, Len Brown <len.brown@...el.com>, Linux-ALSA <alsa-devel@...a-project.org>, Linux PM <linux-pm@...r.kernel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Sascha Hauer <s.hauer@...gutronix.de>, Kevin Hilman <khilman@...nel.org>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>, Daniel Baluta <daniel.baluta@....com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Paul Olaru <paul.olaru@....com>, dl-linux-imx <linux-imx@....com>, Sascha Hauer <kernel@...gutronix.de>, Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>, Shawn Guo <shawnguo@...nel.org>, Fabio Estevam <festevam@...il.com>, "S.j. Wang" <shengjiu.wang@....com>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, Anson Huang <anson.huang@....com> Subject: Re: [RFC PATCH v2 1/2] PM / domains: Introduce multi PM domains helpers On Tue, Apr 21, 2020 at 5:01 PM Ulf Hansson <ulf.hansson@...aro.org> wrote: > > On Wed, 4 Mar 2020 at 13:20, Daniel Baluta <daniel.baluta@....nxp.com> wrote: > > > > From: Daniel Baluta <daniel.baluta@....com> > > > > This patch introduces helpers support for multi PM domains. > > > > API consists of: > > > > 1) dev_multi_pm_attach - powers up all PM domains associated with a given > > device. Because we can attach one PM domain per device, we create > > virtual devices (children of initial device) and associate PM domains > > one per virtual device. > > > > 2) dev_multi_pm_detach - detaches all virtual devices from PM domains > > attached with. > > > > Signed-off-by: Daniel Baluta <daniel.baluta@....com> > > First, apologize for the delay. > > In general I don't mind adding helpers that can be used to decrease > open coding. However, in this case, I wonder how useful the helpers > would really be. > > More precisely, according to the information I have, a device may not > always need all of its PM domains to be turned on together, but > perhaps only a subset of them. Depending on the current use case that > is running. > > Of course, some cases follow your expectations, but as stated, some > others do not. > > Do you have an idea how many users that would be able to switch to > these new APIs as of today? IMX Sound Open Firmware driver will immediately be available to use this new API. https://elixir.bootlin.com/linux/latest/source/sound/soc/sof/imx/imx8.c#L221 Aside, from that there are the ACM clock modules for i.MX8QXP / i.MX8QM. Also, looking at our internal tree there are XUVI, VPU, DPU drivers that need multi power domain support. Anson, Aisheng do you have a number of users on your side for multi power domain? thanks, daniel.
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