clk: qcom: mmcc-msm8960: handle LVDS clock

On APQ8064 the DSI2_PIXEL_SRC clock can be used either to drive the
second DSI host or to drive the LCDC controller. Add LVDS PLL as
possible source to the clock and LVDS output clock. The DSI2_PIXEL_SRC
clock has separate path to be used for the LVDS clock.  To represent
both DSI and LVDS clocks properly, add intermediate clock which toggles
the enable bit and make DSI2_PIXEL_CLK clock just check for the HALT
bit.

Signed-off-by: Dmitry Baryshkov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

Author: lumag

drivers/clk/qcom/mmcc-msm8960.c

@@ -37,6 +37,7 @@ enum {
 	P_DSI2_PLL_DSICLK,
 	P_DSI1_PLL_BYTECLK,
 	P_DSI2_PLL_BYTECLK,
+	P_LVDS_PLL,
 };
 
 #define F_MN(f, s, _m, _n) { .freq = f, .src = s, .m = _m, .n = _n }
@@ -143,6 +144,20 @@ static const struct clk_parent_data mmcc_pxo_dsi2_dsi1[] = {
 	{ .fw_name = "dsi1pll", .name = "dsi1pll" },
 };
 
+static const struct parent_map mmcc_pxo_dsi2_dsi1_lvds_map[] = {
+	{ P_PXO, 0 },
+	{ P_DSI2_PLL_DSICLK, 1 },
+	{ P_LVDS_PLL, 2 },
+	{ P_DSI1_PLL_DSICLK, 3 },
+};
+
+static const struct clk_parent_data mmcc_pxo_dsi2_dsi1_lvds[] = {
+	{ .fw_name = "pxo", .name = "pxo_board" },
+	{ .fw_name = "dsi2pll", .name = "dsi2pll" },
+	{ .fw_name = "lvdspll", .name = "mpd4_lvds_pll" },
+	{ .fw_name = "dsi1pll", .name = "dsi1pll" },
+};
+
 static const struct parent_map mmcc_pxo_dsi1_dsi2_byte_map[] = {
 	{ P_PXO, 0 },
 	{ P_DSI1_PLL_BYTECLK, 1 },
@@ -2439,26 +2454,42 @@ static struct clk_rcg dsi2_pixel_src = {
 	},
 	.s = {
 		.src_sel_shift = 0,
-		.parent_map = mmcc_pxo_dsi2_dsi1_map,
+		.parent_map = mmcc_pxo_dsi2_dsi1_lvds_map,
 	},
 	.clkr = {
 		.enable_reg = 0x0094,
 		.enable_mask = BIT(2),
 		.hw.init = &(struct clk_init_data){
 			.name = "dsi2_pixel_src",
-			.parent_data = mmcc_pxo_dsi2_dsi1,
-			.num_parents = ARRAY_SIZE(mmcc_pxo_dsi2_dsi1),
+			.parent_data = mmcc_pxo_dsi2_dsi1_lvds,
+			.num_parents = ARRAY_SIZE(mmcc_pxo_dsi2_dsi1_lvds),
 			.ops = &clk_rcg_pixel_ops,
 		},
 	},
 };
 
+static struct clk_branch dsi2_pixel_lvds_src = {
+	.clkr = {
+		.enable_reg = 0x0094,
+		.enable_mask = BIT(0),
+		.hw.init = &(struct clk_init_data){
+			.name = "dsi2_pixel_lvds_src",
+			.parent_hws = (const struct clk_hw*[]){
+				&dsi2_pixel_src.clkr.hw
+			},
+			.num_parents = 1,
+			.ops = &clk_branch_simple_ops,
+			.flags = CLK_SET_RATE_PARENT,
+		},
+	},
+};
+
 static struct clk_branch dsi2_pixel_clk = {
 	.halt_reg = 0x01d0,
 	.halt_bit = 19,
 	.clkr = {
 		.enable_reg = 0x0094,
-		.enable_mask = BIT(0),
+		.enable_mask = 0,
 		.hw.init = &(struct clk_init_data){
 			.name = "mdp_pclk2_clk",
 			.parent_hws = (const struct clk_hw*[]){
@@ -2471,6 +2502,24 @@ static struct clk_branch dsi2_pixel_clk = {
 	},
 };
 
+static struct clk_branch lvds_clk = {
+	.halt_reg = 0x024c,
+	.halt_bit = 6,
+	.clkr = {
+		.enable_reg = 0x0264,
+		.enable_mask = BIT(1),
+		.hw.init = &(struct clk_init_data){
+			.name = "mdp_lvds_clk",
+			.parent_hws = (const struct clk_hw*[]){
+				&dsi2_pixel_lvds_src.clkr.hw
+			},
+			.num_parents = 1,
+			.ops = &clk_branch_ops,
+			.flags = CLK_SET_RATE_PARENT,
+		},
+	},
+};
+
 static struct clk_branch gfx2d0_ahb_clk = {
 	.hwcg_reg = 0x0038,
 	.hwcg_bit = 28,
@@ -2799,6 +2848,8 @@ static struct clk_regmap *mmcc_msm8960_clks[] = {
 	[CSIPHY1_TIMER_CLK] = &csiphy1_timer_clk.clkr,
 	[CSIPHY0_TIMER_CLK] = &csiphy0_timer_clk.clkr,
 	[PLL2] = &pll2.clkr,
+	[DSI2_PIXEL_LVDS_SRC] = &dsi2_pixel_lvds_src.clkr,
+	[LVDS_CLK] = &lvds_clk.clkr,
 };
 
 static const struct qcom_reset_map mmcc_msm8960_resets[] = {
@@ -2983,6 +3034,8 @@ static struct clk_regmap *mmcc_apq8064_clks[] = {
 	[VCAP_CLK] = &vcap_clk.clkr,
 	[VCAP_NPL_CLK] = &vcap_npl_clk.clkr,
 	[PLL15] = &pll15.clkr,
+	[DSI2_PIXEL_LVDS_SRC] = &dsi2_pixel_lvds_src.clkr,
+	[LVDS_CLK] = &lvds_clk.clkr,
 };
 
 static const struct qcom_reset_map mmcc_apq8064_resets[] = {