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Date:   Sun, 24 Mar 2019 16:11:04 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     narmstrong@...libre.com, jbrunet@...libre.com,
        linux-amlogic@...ts.infradead.org
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH v2 4/4] clk: meson: meson8b: add the VPU clock trees

The VPU clock tree is slightly different on all three supported SoCs:

Meson8 only has an input mux (which chooses between "fclk_div4",
"fclk_div3", "fclk_div5" and "fclk_div7"), a divider and a gate.

Meson8b has two VPU clock trees, each with an input mux (using the same
parents as the input mux on Meson8), divider and a gates. The final VPU
clock is a glitch-free mux which chooses between VPU_1 and VPU_2.

Meson8m2 uses a similar clock tree as Meson8b but the last input clock
is different: instead of using "fclk_div7" as input Meson8m2 uses
"gp_pll". This was probably done in hardware to improve the accuracy of
the clock because fclk_div7 gives us 2550MHz / 7 = 364.286MHz while
GP_PLL can achieve 364.0MHz.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Reviewed-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/clk/meson/meson8b.c | 167 ++++++++++++++++++++++++++++++++++++
 drivers/clk/meson/meson8b.h |   9 +-
 2 files changed, 175 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/meson/meson8b.c b/drivers/clk/meson/meson8b.c
index 0d08f1ef7af8..8e091c2d10e6 100644
--- a/drivers/clk/meson/meson8b.c
+++ b/drivers/clk/meson/meson8b.c
@@ -1761,6 +1761,147 @@ static struct clk_regmap meson8m2_gp_pll = {
 	},
 };
 
+static const char * const mmeson8b_vpu_0_1_parent_names[] = {
+	"fclk_div4", "fclk_div3", "fclk_div5", "fclk_div7"
+};
+
+static const char * const mmeson8m2_vpu_0_1_parent_names[] = {
+	"fclk_div4", "fclk_div3", "fclk_div5", "gp_pll"
+};
+
+static struct clk_regmap meson8b_vpu_0_sel = {
+	.data = &(struct clk_regmap_mux_data){
+		.offset = HHI_VPU_CLK_CNTL,
+		.mask = 0x3,
+		.shift = 9,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "vpu_0_sel",
+		.ops = &clk_regmap_mux_ops,
+		.parent_names = mmeson8b_vpu_0_1_parent_names,
+		.num_parents = ARRAY_SIZE(mmeson8b_vpu_0_1_parent_names),
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_regmap meson8m2_vpu_0_sel = {
+	.data = &(struct clk_regmap_mux_data){
+		.offset = HHI_VPU_CLK_CNTL,
+		.mask = 0x3,
+		.shift = 9,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "vpu_0_sel",
+		.ops = &clk_regmap_mux_ops,
+		.parent_names = mmeson8m2_vpu_0_1_parent_names,
+		.num_parents = ARRAY_SIZE(mmeson8m2_vpu_0_1_parent_names),
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_regmap meson8b_vpu_0_div = {
+	.data = &(struct clk_regmap_div_data){
+		.offset = HHI_VPU_CLK_CNTL,
+		.shift = 0,
+		.width = 7,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "vpu_0_div",
+		.ops = &clk_regmap_divider_ops,
+		.parent_names = (const char *[]){ "vpu_0_sel" },
+		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_regmap meson8b_vpu_0 = {
+	.data = &(struct clk_regmap_gate_data){
+		.offset = HHI_VPU_CLK_CNTL,
+		.bit_idx = 8,
+	},
+	.hw.init = &(struct clk_init_data) {
+		.name = "vpu_0",
+		.ops = &clk_regmap_gate_ops,
+		.parent_names = (const char *[]){ "vpu_0_div" },
+		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_regmap meson8b_vpu_1_sel = {
+	.data = &(struct clk_regmap_mux_data){
+		.offset = HHI_VPU_CLK_CNTL,
+		.mask = 0x3,
+		.shift = 25,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "vpu_1_sel",
+		.ops = &clk_regmap_mux_ops,
+		.parent_names = mmeson8b_vpu_0_1_parent_names,
+		.num_parents = ARRAY_SIZE(mmeson8b_vpu_0_1_parent_names),
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_regmap meson8m2_vpu_1_sel = {
+	.data = &(struct clk_regmap_mux_data){
+		.offset = HHI_VPU_CLK_CNTL,
+		.mask = 0x3,
+		.shift = 25,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "vpu_1_sel",
+		.ops = &clk_regmap_mux_ops,
+		.parent_names = mmeson8m2_vpu_0_1_parent_names,
+		.num_parents = ARRAY_SIZE(mmeson8m2_vpu_0_1_parent_names),
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_regmap meson8b_vpu_1_div = {
+	.data = &(struct clk_regmap_div_data){
+		.offset = HHI_VPU_CLK_CNTL,
+		.shift = 16,
+		.width = 7,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "vpu_1_div",
+		.ops = &clk_regmap_divider_ops,
+		.parent_names = (const char *[]){ "vpu_1_sel" },
+		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_regmap meson8b_vpu_1 = {
+	.data = &(struct clk_regmap_gate_data){
+		.offset = HHI_VPU_CLK_CNTL,
+		.bit_idx = 24,
+	},
+	.hw.init = &(struct clk_init_data) {
+		.name = "vpu_1",
+		.ops = &clk_regmap_gate_ops,
+		.parent_names = (const char *[]){ "vpu_1_div" },
+		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_regmap meson8b_vpu = {
+	.data = &(struct clk_regmap_mux_data){
+		.offset = HHI_VPU_CLK_CNTL,
+		.mask = 1,
+		.shift = 31,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "vpu",
+		.ops = &clk_regmap_mux_ops,
+		.parent_names = (const char *[]){ "vpu_0", "vpu_1" },
+		.num_parents = 2,
+		.flags = CLK_SET_RATE_NO_REPARENT,
+	},
+};
+
 /* Everything Else (EE) domain gates */
 
 static MESON_GATE(meson8b_ddr, HHI_GCLK_MPEG0, 0);
@@ -2024,6 +2165,9 @@ static struct clk_hw_onecell_data meson8_hw_onecell_data = {
 		[CLKID_MALI_0_SEL]	    = &meson8b_mali_0_sel.hw,
 		[CLKID_MALI_0_DIV]	    = &meson8b_mali_0_div.hw,
 		[CLKID_MALI]		    = &meson8b_mali_0.hw,
+		[CLKID_VPU_0_SEL]	    = &meson8b_vpu_0_sel.hw,
+		[CLKID_VPU_0_DIV]	    = &meson8b_vpu_0_div.hw,
+		[CLKID_VPU]		    = &meson8b_vpu_0.hw,
 		[CLK_NR_CLKS]		    = NULL,
 	},
 	.num = CLK_NR_CLKS,
@@ -2210,6 +2354,13 @@ static struct clk_hw_onecell_data meson8b_hw_onecell_data = {
 		[CLKID_MALI_1_DIV]	    = &meson8b_mali_1_div.hw,
 		[CLKID_MALI_1]		    = &meson8b_mali_1.hw,
 		[CLKID_MALI]		    = &meson8b_mali.hw,
+		[CLKID_VPU_0_SEL]	    = &meson8b_vpu_0_sel.hw,
+		[CLKID_VPU_0_DIV]	    = &meson8b_vpu_0_div.hw,
+		[CLKID_VPU_0]		    = &meson8b_vpu_0.hw,
+		[CLKID_VPU_1_SEL]	    = &meson8b_vpu_1_sel.hw,
+		[CLKID_VPU_1_DIV]	    = &meson8b_vpu_1_div.hw,
+		[CLKID_VPU_1]		    = &meson8b_vpu_1.hw,
+		[CLKID_VPU]		    = &meson8b_vpu.hw,
 		[CLK_NR_CLKS]		    = NULL,
 	},
 	.num = CLK_NR_CLKS,
@@ -2398,6 +2549,13 @@ static struct clk_hw_onecell_data meson8m2_hw_onecell_data = {
 		[CLKID_MALI]		    = &meson8b_mali.hw,
 		[CLKID_GP_PLL_DCO]	    = &meson8m2_gp_pll_dco.hw,
 		[CLKID_GP_PLL]		    = &meson8m2_gp_pll.hw,
+		[CLKID_VPU_0_SEL]	    = &meson8m2_vpu_0_sel.hw,
+		[CLKID_VPU_0_DIV]	    = &meson8b_vpu_0_div.hw,
+		[CLKID_VPU_0]		    = &meson8b_vpu_0.hw,
+		[CLKID_VPU_1_SEL]	    = &meson8m2_vpu_1_sel.hw,
+		[CLKID_VPU_1_DIV]	    = &meson8b_vpu_1_div.hw,
+		[CLKID_VPU_1]		    = &meson8b_vpu_1.hw,
+		[CLKID_VPU]		    = &meson8b_vpu.hw,
 		[CLK_NR_CLKS]		    = NULL,
 	},
 	.num = CLK_NR_CLKS,
@@ -2562,6 +2720,15 @@ static struct clk_regmap *const meson8b_clk_regmaps[] = {
 	&meson8b_mali,
 	&meson8m2_gp_pll_dco,
 	&meson8m2_gp_pll,
+	&meson8b_vpu_0_sel,
+	&meson8m2_vpu_0_sel,
+	&meson8b_vpu_0_div,
+	&meson8b_vpu_0,
+	&meson8b_vpu_1_sel,
+	&meson8m2_vpu_1_sel,
+	&meson8b_vpu_1_div,
+	&meson8b_vpu_1,
+	&meson8b_vpu,
 };
 
 static const struct meson8b_clk_reset_line {
diff --git a/drivers/clk/meson/meson8b.h b/drivers/clk/meson/meson8b.h
index a45f7102c558..e775f91ccce9 100644
--- a/drivers/clk/meson/meson8b.h
+++ b/drivers/clk/meson/meson8b.h
@@ -35,6 +35,7 @@
 #define HHI_VID_DIVIDER_CNTL		0x198 /* 0x66 offset in data sheet */
 #define HHI_SYS_CPU_CLK_CNTL0		0x19c /* 0x67 offset in data sheet */
 #define HHI_MALI_CLK_CNTL		0x1b0 /* 0x6c offset in data sheet */
+#define HHI_VPU_CLK_CNTL		0x1bc /* 0x6f offset in data sheet */
 #define HHI_HDMI_CLK_CNTL		0x1cc /* 0x73 offset in data sheet */
 #define HHI_NAND_CLK_CNTL		0x25c /* 0x97 offset in data sheet */
 #define HHI_MPLL_CNTL			0x280 /* 0xa0 offset in data sheet */
@@ -149,8 +150,14 @@
 #define CLKID_MALI_1		180
 #define CLKID_GP_PLL_DCO	181
 #define CLKID_GP_PLL		182
+#define CLKID_VPU_0_SEL		183
+#define CLKID_VPU_0_DIV		184
+#define CLKID_VPU_0		185
+#define CLKID_VPU_1_SEL		186
+#define CLKID_VPU_1_DIV		187
+#define CLKID_VPU_1		189
 
-#define CLK_NR_CLKS		183
+#define CLK_NR_CLKS		191
 
 /*
  * include the CLKID and RESETID that have
-- 
2.21.0

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