clk: qcom: camcc-sm6350: Specify Titan GDSC power domain as a parent to other

[ Upstream commit a76ce61d7225934b0a52c8172a8cd944002a8c6f ]

When a consumer turns on/off a power domain dependent on another power
domain in hardware, the parent power domain shall be turned on/off by
the power domain provider as well, and to get it the power domain hardware
hierarchy shall be described in the CAMCC driver.

Establish the power domain hierarchy with a Titan GDSC set as a parent of
all other GDSC power domains provided by the SM6350 camera clock controller
to enforce a correct sequence of enabling and disabling power domains by
the consumers, this fixes the CAMCC as a supplier of power domains to CAMSS
IP and its driver.

Fixes: 80f5451d9a ("clk: qcom: Add camera clock controller driver for SM6350")
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Imran Shaik <imran.shaik@oss.qualcomm.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Link: https://lore.kernel.org/r/20251021234450.2271279-3-vladimir.zapolskiy@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/clk/qcom/camcc-sm6350.c

@@ -1692,6 +1692,8 @@ static struct clk_branch camcc_sys_tmr_clk = {
 	},
 };
 
+static struct gdsc titan_top_gdsc;
+
 static struct gdsc bps_gdsc = {
 	.gdscr = 0x6004,
 	.en_rest_wait_val = 0x2,
@@ -1701,6 +1703,7 @@ static struct gdsc bps_gdsc = {
 		.name = "bps_gdsc",
 	},
 	.pwrsts = PWRSTS_OFF_ON,
+	.parent = &titan_top_gdsc.pd,
 	.flags = VOTABLE,
 };
 
@@ -1713,6 +1716,7 @@ static struct gdsc ipe_0_gdsc = {
 		.name = "ipe_0_gdsc",
 	},
 	.pwrsts = PWRSTS_OFF_ON,
+	.parent = &titan_top_gdsc.pd,
 	.flags = VOTABLE,
 };
 
@@ -1725,6 +1729,7 @@ static struct gdsc ife_0_gdsc = {
 		.name = "ife_0_gdsc",
 	},
 	.pwrsts = PWRSTS_OFF_ON,
+	.parent = &titan_top_gdsc.pd,
 };
 
 static struct gdsc ife_1_gdsc = {
@@ -1736,6 +1741,7 @@ static struct gdsc ife_1_gdsc = {
 		.name = "ife_1_gdsc",
 	},
 	.pwrsts = PWRSTS_OFF_ON,
+	.parent = &titan_top_gdsc.pd,
 };
 
 static struct gdsc ife_2_gdsc = {
@@ -1747,6 +1753,7 @@ static struct gdsc ife_2_gdsc = {
 		.name = "ife_2_gdsc",
 	},
 	.pwrsts = PWRSTS_OFF_ON,
+	.parent = &titan_top_gdsc.pd,
 };
 
 static struct gdsc titan_top_gdsc = {