clk: meson: gxbb: Add sd_emmc clk0 clocks

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 <[e-mail]>
Signed-off-by: Neil Armstrong <[e-mail]>

drivers/clk/meson/gxbb.c

···
 	},
 };
 
+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,
+
+		/*
+		 * FIXME:
+		 * We need CLK_IGNORE_UNUSED because mmc DT node point to xtal
+		 * instead of this clock. CCF would gate this on boot, killing
+		 * the mmc controller. Please remove this flag once DT properly
+		 * point to this clock instead of xtal
+		 *
+		 * Same goes for emmc B and C clocks
+		 */
+		.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
+	},
+};
+
+/* 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 | CLK_IGNORE_UNUSED,
+	},
+};
+
+/* 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 | CLK_IGNORE_UNUSED,
+	},
+};
+
 /* Everything Else (EE) domain gates */
 static MESON_GATE(gxbb_ddr, HHI_GCLK_MPEG0, 0);
 static MESON_GATE(gxbb_dos, HHI_GCLK_MPEG0, 1);
···
 		[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,
 		[NR_CLKS]		    = NULL,
 	},
 	.num = NR_CLKS,
···
 		[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,
 		[NR_CLKS]		    = NULL,
 	},
 	.num = NR_CLKS,
···
 	&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[] = {
···
 	&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[] = {
···
 	&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[] = {