clk: renesas: cpg-mssr: Set GENPD_FLAG_ALWAYS_ON for clock domain

BugLink: https://bugs.launchpad.net/bugs/1848047
[ Upstream commit f787216f33ce5b5a2567766398f44ab62157114c ]

The CPG/MSSR Clock Domain driver does not implement the
generic_pm_domain.power_{on,off}() callbacks, as the domain itself
cannot be powered down.  Hence the domain should be marked as always-on
by setting the GENPD_FLAG_ALWAYS_ON flag, to prevent the core PM Domain
code from considering it for power-off, and doing unnessary processing.

Note that this only affects RZ/A2 SoCs.  On R-Car Gen2 and Gen3 SoCs,
the R-Car SYSC driver handles Clock Domain creation, and offloads only
device attachment/detachment to the CPG/MSSR driver.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/clk/renesas/renesas-cpg-mssr.c b/drivers/clk/renesas/renesas-cpg-mssr.c
index d4075b13067429cded1088e6423b77bb78b5309b..132cc96895e3a97845b7d086ea83053e8299b799 100644 (file)
--- a/drivers/clk/renesas/renesas-cpg-mssr.c
+++ b/drivers/clk/renesas/renesas-cpg-mssr.c
@@ -551,7 +551,8 @@ static int __init cpg_mssr_add_clk_domain(struct device *dev,
 
        genpd = &pd->genpd;
        genpd->name = np->name;
-       genpd->flags = GENPD_FLAG_PM_CLK | GENPD_FLAG_ACTIVE_WAKEUP;
+       genpd->flags = GENPD_FLAG_PM_CLK | GENPD_FLAG_ALWAYS_ON |
+                      GENPD_FLAG_ACTIVE_WAKEUP;
        genpd->attach_dev = cpg_mssr_attach_dev;
        genpd->detach_dev = cpg_mssr_detach_dev;
        pm_genpd_init(genpd, &pm_domain_always_on_gov, false);