clk: gxbb: add the SAR ADC clocks and expose them

The HHI_SAR_CLK_CNTL contains three SAR ADC specific clocks:
- a mux clock to choose between different ADC reference clocks (this is
  2-bit wide, but the datasheet only lists the parents for the first
  bit)
- a divider for the input/reference clock
- a gate which enables the ADC clock

Additionally this exposes the ADC core clock (CLKID_SAR_ADC) and
CLKID_SANA (which seems to enable the analog inputs, but unfortunately
there is no documentation for this - we just mimic what the vendor
driver does).

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

drivers/clk/meson/gxbb.c

@@ -564,6 +564,46 @@ static struct clk_gate gxbb_clk81 = {
 	},
 };
 
+static struct clk_mux gxbb_sar_adc_clk_sel = {
+	.reg = (void *)HHI_SAR_CLK_CNTL,
+	.mask = 0x3,
+	.shift = 9,
+	.lock = &clk_lock,
+	.hw.init = &(struct clk_init_data){
+		.name = "sar_adc_clk_sel",
+		.ops = &clk_mux_ops,
+		/* NOTE: The datasheet doesn't list the parents for bit 10 */
+		.parent_names = (const char *[]){ "xtal", "clk81", },
+		.num_parents = 2,
+	},
+};
+
+static struct clk_divider gxbb_sar_adc_clk_div = {
+	.reg = (void *)HHI_SAR_CLK_CNTL,
+	.shift = 0,
+	.width = 8,
+	.lock = &clk_lock,
+	.hw.init = &(struct clk_init_data){
+		.name = "sar_adc_clk_div",
+		.ops = &clk_divider_ops,
+		.parent_names = (const char *[]){ "sar_adc_clk_sel" },
+		.num_parents = 1,
+	},
+};
+
+static struct clk_gate gxbb_sar_adc_clk = {
+	.reg = (void *)HHI_SAR_CLK_CNTL,
+	.bit_idx = 8,
+	.lock = &clk_lock,
+	.hw.init = &(struct clk_init_data){
+		.name = "sar_adc_clk",
+		.ops = &clk_gate_ops,
+		.parent_names = (const char *[]){ "sar_adc_clk_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);
@@ -754,6 +794,9 @@ static struct clk_hw_onecell_data gxbb_hw_onecell_data = {
 		[CLKID_SD_EMMC_A]	    = &gxbb_emmc_a.hw,
 		[CLKID_SD_EMMC_B]	    = &gxbb_emmc_b.hw,
 		[CLKID_SD_EMMC_C]	    = &gxbb_emmc_c.hw,
+		[CLKID_SAR_ADC_CLK]	    = &gxbb_sar_adc_clk.hw,
+		[CLKID_SAR_ADC_SEL]	    = &gxbb_sar_adc_clk_sel.hw,
+		[CLKID_SAR_ADC_DIV]	    = &gxbb_sar_adc_clk_div.hw,
 	},
 	.num = NR_CLKS,
 };
@@ -856,6 +899,7 @@ static struct clk_gate *gxbb_clk_gates[] = {
 	&gxbb_emmc_a,
 	&gxbb_emmc_b,
 	&gxbb_emmc_c,
+	&gxbb_sar_adc_clk,
 };
 
 static int gxbb_clkc_probe(struct platform_device *pdev)
@@ -888,6 +932,10 @@ static int gxbb_clkc_probe(struct platform_device *pdev)
 	gxbb_mpeg_clk_sel.reg = clk_base + (u64)gxbb_mpeg_clk_sel.reg;
 	gxbb_mpeg_clk_div.reg = clk_base + (u64)gxbb_mpeg_clk_div.reg;
 
+	/* Populate the base address for the SAR ADC clks */
+	gxbb_sar_adc_clk_sel.reg = clk_base + (u64)gxbb_sar_adc_clk_sel.reg;
+	gxbb_sar_adc_clk_div.reg = clk_base + (u64)gxbb_sar_adc_clk_div.reg;
+
 	/* Populate base address for gates */
 	for (i = 0; i < ARRAY_SIZE(gxbb_clk_gates); i++)
 		gxbb_clk_gates[i]->reg = clk_base +

drivers/clk/meson/gxbb.h

@@ -191,7 +191,7 @@
 #define CLKID_PERIPHS		  20
 #define CLKID_SPICC		  21
 /* CLKID_I2C */
-#define CLKID_SAR_ADC		  23
+/* #define CLKID_SAR_ADC */
 #define CLKID_SMART_CARD	  24
 #define CLKID_RNG0		  25
 #define CLKID_UART0		  26
@@ -237,7 +237,7 @@
 #define CLKID_MMC_PCLK		  66
 #define CLKID_DVIN		  67
 #define CLKID_UART2		  68
-#define CLKID_SANA		  69
+/* #define CLKID_SANA */
 #define CLKID_VPU_INTR		  70
 #define CLKID_SEC_AHB_AHB3_BRIDGE 71
 #define CLKID_CLK81_A53		  72
@@ -265,8 +265,11 @@
 /* CLKID_SD_EMMC_A */
 /* CLKID_SD_EMMC_B */
 /* CLKID_SD_EMMC_C */
+/* CLKID_SAR_ADC_CLK */
+/* CLKID_SAR_ADC_SEL */
+#define CLKID_SAR_ADC_DIV	  99
 
-#define NR_CLKS			  97
+#define NR_CLKS			  100
 
 /* include the CLKIDs that have been made part of the stable DT binding */
 #include <dt-bindings/clock/gxbb-clkc.h>

include/dt-bindings/clock/gxbb-clkc.h

@@ -14,6 +14,7 @@
 #define CLKID_MPLL2		15
 #define CLKID_SPI		34
 #define CLKID_I2C		22
+#define CLKID_SAR_ADC		23
 #define CLKID_ETH		36
 #define CLKID_USB0		50
 #define CLKID_USB1		51
@@ -21,10 +22,13 @@
 #define CLKID_HDMI_PCLK		63
 #define CLKID_USB1_DDR_BRIDGE	64
 #define CLKID_USB0_DDR_BRIDGE	65
+#define CLKID_SANA		69
 #define CLKID_GCLK_VENCI_INT0	77
 #define CLKID_AO_I2C		93
 #define CLKID_SD_EMMC_A		94
 #define CLKID_SD_EMMC_B		95
 #define CLKID_SD_EMMC_C		96
+#define CLKID_SAR_ADC_CLK	97
+#define CLKID_SAR_ADC_SEL	98
 
 #endif /* __GXBB_CLKC_H */