clk: qcom: Add GDSC support for SDX55 GCC

Add GDSC support to control the power supply of power domains in SDX55
GCC.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20201126072844.35370-7-manivannan.sadhasivam@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/qcom/Kconfig

@@ -424,6 +424,7 @@ config SDM_LPASSCC_845
 
 config SDX_GCC_55
 	tristate "SDX55 Global Clock Controller"
+	select QCOM_GDSC
 	help
 	  Support for the global clock controller on SDX55 devices.
 	  Say Y if you want to use peripheral devices such as UART,

drivers/clk/qcom/gcc-sdx55.c

@@ -17,6 +17,7 @@
 #include "clk-pll.h"
 #include "clk-rcg.h"
 #include "clk-regmap.h"
+#include "gdsc.h"
 #include "reset.h"
 
 enum {
@@ -1455,6 +1456,30 @@ static struct clk_branch gcc_xo_pcie_link_clk = {
 	},
 };
 
+static struct gdsc usb30_gdsc = {
+	.gdscr = 0x0b004,
+	.pd = {
+		.name = "usb30_gdsc",
+	},
+	.pwrsts = PWRSTS_OFF_ON,
+};
+
+static struct gdsc pcie_gdsc = {
+	.gdscr = 0x37004,
+	.pd = {
+		.name = "pcie_gdsc",
+	},
+	.pwrsts = PWRSTS_OFF_ON,
+};
+
+static struct gdsc emac_gdsc = {
+	.gdscr = 0x47004,
+	.pd = {
+		.name = "emac_gdsc",
+	},
+	.pwrsts = PWRSTS_OFF_ON,
+};
+
 static struct clk_regmap *gcc_sdx55_clocks[] = {
 	[GCC_AHB_PCIE_LINK_CLK] = &gcc_ahb_pcie_link_clk.clkr,
 	[GCC_BLSP1_AHB_CLK] = &gcc_blsp1_ahb_clk.clkr,
@@ -1560,6 +1585,12 @@ static const struct qcom_reset_map gcc_sdx55_resets[] = {
 	[GCC_USB_PHY_CFG_AHB2PHY_BCR] = { 0xe000 },
 };
 
+static struct gdsc *gcc_sdx55_gdscs[] = {
+	[USB30_GDSC] = &usb30_gdsc,
+	[PCIE_GDSC] = &pcie_gdsc,
+	[EMAC_GDSC] = &emac_gdsc,
+};
+
 static const struct regmap_config gcc_sdx55_regmap_config = {
 	.reg_bits	= 32,
 	.reg_stride	= 4,
@@ -1574,6 +1605,8 @@ static const struct qcom_cc_desc gcc_sdx55_desc = {
 	.num_clks = ARRAY_SIZE(gcc_sdx55_clocks),
 	.resets = gcc_sdx55_resets,
 	.num_resets = ARRAY_SIZE(gcc_sdx55_resets),
+	.gdscs = gcc_sdx55_gdscs,
+	.num_gdscs = ARRAY_SIZE(gcc_sdx55_gdscs),
 };
 
 static const struct of_device_id gcc_sdx55_match_table[] = {