[PATCH v1 2/6] clk: meson: a1: pll: support 'syspll' general-purpose PLL for CPU clock

[Dmitry Rokosov]

The 'syspll' PLL, also known as the system PLL, is a general and
essential PLL responsible for generating the CPU clock frequency.
With its wide-ranging capabilities, it is designed to accommodate
frequencies within the range of 768MHz to 1536MHz.

Signed-off-by: Dmitry Rokosov <ddrokosov at salutedevices.com>
---
 drivers/clk/meson/a1-pll.c | 78 ++++++++++++++++++++++++++++++++++++++
 drivers/clk/meson/a1-pll.h |  6 +++
 2 files changed, 84 insertions(+)

diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c
index 60b2e53e7e51..02fd2d325cc6 100644
--- a/drivers/clk/meson/a1-pll.c
+++ b/drivers/clk/meson/a1-pll.c
@@ -138,6 +138,81 @@ static struct clk_regmap hifi_pll = {
 	},
 };
 
+static const struct pll_mult_range sys_pll_mult_range = {
+	.min = 32,
+	.max = 64,
+};
+
+/*
+ * We assume that the sys_pll_clk has already been set up by the low-level
+ * bootloaders as the main CPU PLL source. Therefore, it is not necessary to
+ * run the initialization sequence.
+ */
+static struct clk_regmap sys_pll = {
+	.data = &(struct meson_clk_pll_data){
+		.en = {
+			.reg_off = ANACTRL_SYSPLL_CTRL0,
+			.shift   = 28,
+			.width   = 1,
+		},
+		.m = {
+			.reg_off = ANACTRL_SYSPLL_CTRL0,
+			.shift   = 0,
+			.width   = 8,
+		},
+		.n = {
+			.reg_off = ANACTRL_SYSPLL_CTRL0,
+			.shift   = 10,
+			.width   = 5,
+		},
+		.frac = {
+			.reg_off = ANACTRL_SYSPLL_CTRL1,
+			.shift   = 0,
+			.width   = 19,
+		},
+		.l = {
+			.reg_off = ANACTRL_SYSPLL_STS,
+			.shift   = 31,
+			.width   = 1,
+		},
+		.current_en = {
+			.reg_off = ANACTRL_SYSPLL_CTRL0,
+			.shift   = 26,
+			.width   = 1,
+		},
+		.l_detect = {
+			.reg_off = ANACTRL_SYSPLL_CTRL2,
+			.shift   = 6,
+			.width   = 1,
+		},
+		.range = &sys_pll_mult_range,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "sys_pll",
+		.ops = &meson_clk_pll_ops,
+		.parent_names = (const char *[]){ "syspll_in" },
+		.num_parents = 1,
+		/*
+		 * This clock is used as the main CPU PLL source in low-level
+		 * bootloaders, and it is necessary to mark it as critical.
+		 */
+		.flags = CLK_IS_CRITICAL,
+	},
+};
+
+static struct clk_fixed_factor sys_pll_div16 = {
+	.mult = 1,
+	.div = 16,
+	.hw.init = &(struct clk_init_data){
+		.name = "sys_pll_div16",
+		.ops = &clk_fixed_factor_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&sys_pll.hw
+		},
+		.num_parents = 1,
+	},
+};
+
 static struct clk_fixed_factor fclk_div2_div = {
 	.mult = 1,
 	.div = 2,
@@ -283,6 +358,8 @@ static struct clk_hw *a1_pll_hw_clks[] = {
 	[CLKID_FCLK_DIV5]	= &fclk_div5.hw,
 	[CLKID_FCLK_DIV7]	= &fclk_div7.hw,
 	[CLKID_HIFI_PLL]	= &hifi_pll.hw,
+	[CLKID_SYS_PLL]		= &sys_pll.hw,
+	[CLKID_SYS_PLL_DIV16]	= &sys_pll_div16.hw,
 };
 
 static struct clk_regmap *const a1_pll_regmaps[] = {
@@ -293,6 +370,7 @@ static struct clk_regmap *const a1_pll_regmaps[] = {
 	&fclk_div5,
 	&fclk_div7,
 	&hifi_pll,
+	&sys_pll,
 };
 
 static struct regmap_config a1_pll_regmap_cfg = {
diff --git a/drivers/clk/meson/a1-pll.h b/drivers/clk/meson/a1-pll.h
index 4be17b2bf383..666d9b2137e9 100644
--- a/drivers/clk/meson/a1-pll.h
+++ b/drivers/clk/meson/a1-pll.h
@@ -18,6 +18,12 @@
 #define ANACTRL_FIXPLL_CTRL0	0x0
 #define ANACTRL_FIXPLL_CTRL1	0x4
 #define ANACTRL_FIXPLL_STS	0x14
+#define ANACTRL_SYSPLL_CTRL0	0x80
+#define ANACTRL_SYSPLL_CTRL1	0x84
+#define ANACTRL_SYSPLL_CTRL2	0x88
+#define ANACTRL_SYSPLL_CTRL3	0x8c
+#define ANACTRL_SYSPLL_CTRL4	0x90
+#define ANACTRL_SYSPLL_STS	0x94
 #define ANACTRL_HIFIPLL_CTRL0	0xc0
 #define ANACTRL_HIFIPLL_CTRL1	0xc4
 #define ANACTRL_HIFIPLL_CTRL2	0xc8
-- 
2.43.0