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| author |   Ulf Hansson <ulf.hansson@linaro.org> | 2021-03-17 10:31:17 +0100 |
|---|---|---|
| committer |   Shawn Guo <shawnguo@kernel.org> | 2021-03-29 08:59:33 +0800 |
| commit | 7c6b0892b0c5009d5eb8715070a18862f18d7df5 (patch) | |
| tree | e10a15dc510eb415cebbe4085ee3373bb4310bd6 /drivers/firmware/imx | |
| parent | firmware: imx: scu-pd: do not power off console domain (diff) | |
| download | linux-dev-7c6b0892b0c5009d5eb8715070a18862f18d7df5.tar.xz linux-dev-7c6b0892b0c5009d5eb8715070a18862f18d7df5.zip | |
firmware: imx: scu-pd: Update comments for single global power domain
Since the introduction of the PM domain support for the scu-pd, the genpd
framework has been continuously improved. More preciously, using a single
global power domain can quite easily be deployed for imx platforms.
To avoid confusions, let's therefore make an update to the comments about
the missing pieces.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/firmware/imx')
| -rw-r--r-- | drivers/firmware/imx/scu-pd.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/firmware/imx/scu-pd.c b/drivers/firmware/imx/scu-pd.c index 338800d16c65..34075436f0f9 100644 --- a/drivers/firmware/imx/scu-pd.c +++ b/drivers/firmware/imx/scu-pd.c @@ -29,6 +29,10 @@ * The framework needs some proper extension to support multi power * domain cases. * + * Update: Genpd assigns the ->of_node for the virtual device before it + * invokes ->attach_dev() callback, hence parsing for device resources via + * DT should work fine. + * * 2. It also breaks most of current drivers as the driver probe sequence * behavior changed if removing ->power_on|off() callback and use * ->start() and ->stop() instead. genpd_dev_pm_attach will only power @@ -39,8 +43,11 @@ * domain enabled will trigger a HW access error. That means we need fix * most drivers probe sequence with proper runtime pm. * - * In summary, we need fix above two issue before being able to switch to - * the "single global power domain" way. + * Update: Runtime PM support isn't necessary. Instead, this can easily be + * fixed in drivers by adding a call to dev_pm_domain_start() during probe. + * + * In summary, the second part needs to be addressed via minor updates to the + * relevant drivers, before the "single global power domain" model can be used. * */ |