[PATCH v2 2/4] soc: mediatek: pm-domains: Add default power off flag

[Weiyi Lu]

For some power domain, like conn on MT8192, it should be default OFF.
Because the power on/off control relies the function of connectivity chip
and its firmware. And if project choose other chip vendor solution,
those necessary connectivity functions will not provided.

Signed-off-by: Weiyi Lu <weiyi...@mediatek.com>
---
 drivers/soc/mediatek/mtk-pm-domains.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-pm-domains.c 
b/drivers/soc/mediatek/mtk-pm-domains.c
index b7ccf94..50a7ae1 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.c
+++ b/drivers/soc/mediatek/mtk-pm-domains.c
@@ -24,6 +24,7 @@
 #define MTK_SCPD_ACTIVE_WAKEUP         BIT(0)
 #define MTK_SCPD_FWAIT_SRAM            BIT(1)
 #define MTK_SCPD_SRAM_ISO              BIT(2)
+#define MTK_SCPD_KEEP_DEFAULT_OFF      BIT(3)
 #define MTK_SCPD_CAPS(_scpd, _x)       ((_scpd)->data->caps & (_x))
 
 #define SPM_VDE_PWR_CON                        0x0210
@@ -506,17 +507,26 @@ static int scpsys_add_one_domain(struct scpsys *scpsys, 
struct device_node *node
         * software.  The unused domains will be switched off during
         * late_init time.
         */
-       ret = scpsys_power_on(&pd->genpd);
-       if (ret < 0) {
-               dev_err_probe(scpsys->dev, ret, "failed to power on domain 
%pOFN\n", node);
-               goto err_unprepare_clocks;
+       if (MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF)) {
+               if (scpsys_domain_is_on(pd))
+                       dev_warn(scpsys->dev,
+                                "A default off power domain %pOFN has been 
ON\n", node);
+       } else {
+               ret = scpsys_power_on(&pd->genpd);
+               if (ret < 0) {
+                       dev_err_probe(scpsys->dev, ret, "failed to power on 
domain %pOFN\n", node);
+                       goto err_unprepare_clocks;
+               }
        }
 
        pd->genpd.name = node->name;
        pd->genpd.power_off = scpsys_power_off;
        pd->genpd.power_on = scpsys_power_on;
 
-       pm_genpd_init(&pd->genpd, NULL, false);
+       if (MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF))
+               pm_genpd_init(&pd->genpd, NULL, true);
+       else
+               pm_genpd_init(&pd->genpd, NULL, false);
 
        scpsys->domains[id] = &pd->genpd;
        return 0;
@@ -603,7 +613,8 @@ static void scpsys_remove_one_domain(struct scpsys_domain 
*pd)
                        "failed to remove domain '%s' : %d - state may be 
inconsistent\n",
                        pd->genpd.name, ret);
 
-       scpsys_power_off(&pd->genpd);
+       if (!MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF))
+               scpsys_power_off(&pd->genpd);
 
        clk_bulk_unprepare(pd->num_clks, pd->clks);
        clk_bulk_put(pd->num_clks, pd->clks);
-- 
1.8.1.1.dirty