[PATCH v2] clk: meson: gxbb: add sd_emmc clk0 clocks

[Jerome Brunet]

Input source 0 of the mmc controllers is not directly xtal, as currently
described in DT. Each controller is fed by a composite clock (the usual
mux, divider and gate). The muxes inputs are the xtal (default) and the
fclk_div clocks. These parents, along with the divider, should be able to
provide the necessary rates for mmc and nand operation.

The input muxes should also be able to take mpll2, mpll3 and gp0_pll but
these are precious clocks, needed for other usage. It is better if the
mmc does not use these them. For this reason, mpll2, mpll3 and gp0_pll is
not listed among the possible parents.

Signed-off-by: Jerome Brunet <jbrunet@xxxxxxxxxxxx>
---

Changes since v1: [0]
 - Correct commit description and comments.
 - No functional changes

[0]: https://lkml.kernel.org/r/20170726203138.11367-1-jbrunet@xxxxxxxxxxxx

 drivers/clk/meson/gxbb.c | 167 +++++++++++++++++++++++++++++++++++++++++++++++
 drivers/clk/meson/gxbb.h |  11 +++-
 2 files changed, 177 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/meson/gxbb.c b/drivers/clk/meson/gxbb.c
index a897ea45327c..d966ae85f9f9 100644
--- a/drivers/clk/meson/gxbb.c
+++ b/drivers/clk/meson/gxbb.c
@@ -974,6 +974,146 @@ static struct clk_mux gxbb_32k_clk_sel = {
 	},
 };
 
+static const char * const gxbb_sd_emmc_clk0_parent_names[] = {
+	"xtal", "fclk_div2", "fclk_div3", "fclk_div5", "fclk_div7",
+
+	/*
+	 * Following these parent clocks, we should also have had mpll2, mpll3
+	 * and gp0_pll but these clocks are too precious to be used here. All
+	 * the necessary rates for MMC and NAND operation can be acheived using
+	 * xtal or fclk_div clocks
+	 */
+};
+
+/* SDIO clock */
+static struct clk_mux gxbb_sd_emmc_a_clk0_sel = {
+	.reg = (void *)HHI_SD_EMMC_CLK_CNTL,
+	.mask = 0x7,
+	.shift = 9,
+	.lock = &clk_lock,
+	.hw.init = &(struct clk_init_data) {
+		.name = "sd_emmc_a_clk0_sel",
+		.ops = &clk_mux_ops,
+		.parent_names = gxbb_sd_emmc_clk0_parent_names,
+		.num_parents = ARRAY_SIZE(gxbb_sd_emmc_clk0_parent_names),
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_divider gxbb_sd_emmc_a_clk0_div = {
+	.reg = (void *)HHI_SD_EMMC_CLK_CNTL,
+	.shift = 0,
+	.width = 7,
+	.lock = &clk_lock,
+	.flags = CLK_DIVIDER_ROUND_CLOSEST,
+	.hw.init = &(struct clk_init_data) {
+		.name = "sd_emmc_a_clk0_div",
+		.ops = &clk_divider_ops,
+		.parent_names = (const char *[]){ "sd_emmc_a_clk0_sel" },
+		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_gate gxbb_sd_emmc_a_clk0 = {
+	.reg = (void *)HHI_SD_EMMC_CLK_CNTL,
+	.bit_idx = 7,
+	.lock = &clk_lock,
+	.hw.init = &(struct clk_init_data){
+		.name = "sd_emmc_a_clk0",
+		.ops = &clk_gate_ops,
+		.parent_names = (const char *[]){ "sd_emmc_a_clk0_div" },
+		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+/* SDcard clock */
+static struct clk_mux gxbb_sd_emmc_b_clk0_sel = {
+	.reg = (void *)HHI_SD_EMMC_CLK_CNTL,
+	.mask = 0x7,
+	.shift = 25,
+	.lock = &clk_lock,
+	.hw.init = &(struct clk_init_data) {
+		.name = "sd_emmc_b_clk0_sel",
+		.ops = &clk_mux_ops,
+		.parent_names = gxbb_sd_emmc_clk0_parent_names,
+		.num_parents = ARRAY_SIZE(gxbb_sd_emmc_clk0_parent_names),
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_divider gxbb_sd_emmc_b_clk0_div = {
+	.reg = (void *)HHI_SD_EMMC_CLK_CNTL,
+	.shift = 16,
+	.width = 7,
+	.lock = &clk_lock,
+	.flags = CLK_DIVIDER_ROUND_CLOSEST,
+	.hw.init = &(struct clk_init_data) {
+		.name = "sd_emmc_b_clk0_div",
+		.ops = &clk_divider_ops,
+		.parent_names = (const char *[]){ "sd_emmc_b_clk0_sel" },
+		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_gate gxbb_sd_emmc_b_clk0 = {
+	.reg = (void *)HHI_SD_EMMC_CLK_CNTL,
+	.bit_idx = 23,
+	.lock = &clk_lock,
+	.hw.init = &(struct clk_init_data){
+		.name = "sd_emmc_b_clk0",
+		.ops = &clk_gate_ops,
+		.parent_names = (const char *[]){ "sd_emmc_b_clk0_div" },
+		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+/* EMMC/NAND clock */
+static struct clk_mux gxbb_sd_emmc_c_clk0_sel = {
+	.reg = (void *)HHI_NAND_CLK_CNTL,
+	.mask = 0x7,
+	.shift = 9,
+	.lock = &clk_lock,
+	.hw.init = &(struct clk_init_data) {
+		.name = "sd_emmc_c_clk0_sel",
+		.ops = &clk_mux_ops,
+		.parent_names = gxbb_sd_emmc_clk0_parent_names,
+		.num_parents = ARRAY_SIZE(gxbb_sd_emmc_clk0_parent_names),
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_divider gxbb_sd_emmc_c_clk0_div = {
+	.reg = (void *)HHI_NAND_CLK_CNTL,
+	.shift = 0,
+	.width = 7,
+	.lock = &clk_lock,
+	.flags = CLK_DIVIDER_ROUND_CLOSEST,
+	.hw.init = &(struct clk_init_data) {
+		.name = "sd_emmc_c_clk0_div",
+		.ops = &clk_divider_ops,
+		.parent_names = (const char *[]){ "sd_emmc_c_clk0_sel" },
+		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_gate gxbb_sd_emmc_c_clk0 = {
+	.reg = (void *)HHI_NAND_CLK_CNTL,
+	.bit_idx = 7,
+	.lock = &clk_lock,
+	.hw.init = &(struct clk_init_data){
+		.name = "sd_emmc_c_clk0",
+		.ops = &clk_gate_ops,
+		.parent_names = (const char *[]){ "sd_emmc_c_clk0_div" },
+		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
 /* Everything Else (EE) domain gates */
 static MESON_GATE(gxbb_ddr, HHI_GCLK_MPEG0, 0);
 static MESON_GATE(gxbb_dos, HHI_GCLK_MPEG0, 1);
@@ -1183,6 +1323,15 @@ static struct clk_hw_onecell_data gxbb_hw_onecell_data = {
 		[CLKID_32K_CLK]		    = &gxbb_32k_clk.hw,
 		[CLKID_32K_CLK_SEL]	    = &gxbb_32k_clk_sel.hw,
 		[CLKID_32K_CLK_DIV]	    = &gxbb_32k_clk_div.hw,
+		[CLKID_SD_EMMC_A_CLK0_SEL]  = &gxbb_sd_emmc_a_clk0_sel.hw,
+		[CLKID_SD_EMMC_A_CLK0_DIV]  = &gxbb_sd_emmc_a_clk0_div.hw,
+		[CLKID_SD_EMMC_A_CLK0]	    = &gxbb_sd_emmc_a_clk0.hw,
+		[CLKID_SD_EMMC_B_CLK0_SEL]  = &gxbb_sd_emmc_b_clk0_sel.hw,
+		[CLKID_SD_EMMC_B_CLK0_DIV]  = &gxbb_sd_emmc_b_clk0_div.hw,
+		[CLKID_SD_EMMC_B_CLK0]	    = &gxbb_sd_emmc_b_clk0.hw,
+		[CLKID_SD_EMMC_C_CLK0_SEL]  = &gxbb_sd_emmc_c_clk0_sel.hw,
+		[CLKID_SD_EMMC_C_CLK0_DIV]  = &gxbb_sd_emmc_c_clk0_div.hw,
+		[CLKID_SD_EMMC_C_CLK0]	    = &gxbb_sd_emmc_c_clk0.hw,
 	},
 	.num = NR_CLKS,
 };
@@ -1305,6 +1454,15 @@ static struct clk_hw_onecell_data gxl_hw_onecell_data = {
 		[CLKID_32K_CLK]		    = &gxbb_32k_clk.hw,
 		[CLKID_32K_CLK_SEL]	    = &gxbb_32k_clk_sel.hw,
 		[CLKID_32K_CLK_DIV]	    = &gxbb_32k_clk_div.hw,
+		[CLKID_SD_EMMC_A_CLK0_SEL]  = &gxbb_sd_emmc_a_clk0_sel.hw,
+		[CLKID_SD_EMMC_A_CLK0_DIV]  = &gxbb_sd_emmc_a_clk0_div.hw,
+		[CLKID_SD_EMMC_A_CLK0]	    = &gxbb_sd_emmc_a_clk0.hw,
+		[CLKID_SD_EMMC_B_CLK0_SEL]  = &gxbb_sd_emmc_b_clk0_sel.hw,
+		[CLKID_SD_EMMC_B_CLK0_DIV]  = &gxbb_sd_emmc_b_clk0_div.hw,
+		[CLKID_SD_EMMC_B_CLK0]	    = &gxbb_sd_emmc_b_clk0.hw,
+		[CLKID_SD_EMMC_C_CLK0_SEL]  = &gxbb_sd_emmc_c_clk0_sel.hw,
+		[CLKID_SD_EMMC_C_CLK0_DIV]  = &gxbb_sd_emmc_c_clk0_div.hw,
+		[CLKID_SD_EMMC_C_CLK0]	    = &gxbb_sd_emmc_c_clk0.hw,
 	},
 	.num = NR_CLKS,
 };
@@ -1420,6 +1578,9 @@ static struct clk_gate *const gxbb_clk_gates[] = {
 	&gxbb_cts_amclk,
 	&gxbb_cts_mclk_i958,
 	&gxbb_32k_clk,
+	&gxbb_sd_emmc_a_clk0,
+	&gxbb_sd_emmc_b_clk0,
+	&gxbb_sd_emmc_c_clk0,
 };
 
 static struct clk_mux *const gxbb_clk_muxes[] = {
@@ -1432,6 +1593,9 @@ static struct clk_mux *const gxbb_clk_muxes[] = {
 	&gxbb_cts_mclk_i958_sel,
 	&gxbb_cts_i958,
 	&gxbb_32k_clk_sel,
+	&gxbb_sd_emmc_a_clk0_sel,
+	&gxbb_sd_emmc_b_clk0_sel,
+	&gxbb_sd_emmc_c_clk0_sel,
 };
 
 static struct clk_divider *const gxbb_clk_dividers[] = {
@@ -1441,6 +1605,9 @@ static struct clk_divider *const gxbb_clk_dividers[] = {
 	&gxbb_mali_1_div,
 	&gxbb_cts_mclk_i958_div,
 	&gxbb_32k_clk_div,
+	&gxbb_sd_emmc_a_clk0_div,
+	&gxbb_sd_emmc_b_clk0_div,
+	&gxbb_sd_emmc_c_clk0_div,
 };
 
 static struct meson_clk_audio_divider *const gxbb_audio_dividers[] = {
diff --git a/drivers/clk/meson/gxbb.h b/drivers/clk/meson/gxbb.h
index d63e77e8433d..17e5629777dc 100644
--- a/drivers/clk/meson/gxbb.h
+++ b/drivers/clk/meson/gxbb.h
@@ -287,8 +287,17 @@
 #define CLKID_32K_CLK		  114
 #define CLKID_32K_CLK_SEL	  115
 #define CLKID_32K_CLK_DIV	  116
+#define CLKID_SD_EMMC_A_CLK0_SEL  117
+#define CLKID_SD_EMMC_A_CLK0_DIV  118
+#define CLKID_SD_EMMC_A_CLK0	  119
+#define CLKID_SD_EMMC_B_CLK0_SEL  120
+#define CLKID_SD_EMMC_B_CLK0_DIV  121
+#define CLKID_SD_EMMC_B_CLK0	  122
+#define CLKID_SD_EMMC_C_CLK0_SEL  123
+#define CLKID_SD_EMMC_C_CLK0_DIV  124
+#define CLKID_SD_EMMC_C_CLK0	  125
 
-#define NR_CLKS			  117
+#define NR_CLKS			  126
 
 /* include the CLKIDs that have been made part of the stable DT binding */
 #include <dt-bindings/clock/gxbb-clkc.h>
-- 
2.9.4