diff mbox series

[v2,3/7] clk: meson: a1: pll: support 'syspll' general-purpose PLL for CPU clock

Message ID 20240510090933.19464-4-ddrokosov@salutedevices.com (mailing list archive)
State New, archived
Headers show
Series clk: meson: introduce Amlogic A1 SoC Family CPU clock controller driver | expand

Commit Message

Dmitry Rokosov May 10, 2024, 9:08 a.m. UTC 
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@salutedevices.com>
---
 drivers/clk/meson/a1-pll.c | 79 ++++++++++++++++++++++++++++++++++++++
 drivers/clk/meson/a1-pll.h |  6 +++
 2 files changed, 85 insertions(+)

Comments

Jerome Brunet May 13, 2024, 12:48 p.m. UTC | #1 
On Fri 10 May 2024 at 12:08, Dmitry Rokosov <ddrokosov@salutedevices.com> wrote:

> 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@salutedevices.com>
> ---
>  drivers/clk/meson/a1-pll.c | 79 ++++++++++++++++++++++++++++++++++++++
>  drivers/clk/meson/a1-pll.h |  6 +++
>  2 files changed, 85 insertions(+)
>
> diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c
> index 60b2e53e7e51..af47ba308bbe 100644
> --- a/drivers/clk/meson/a1-pll.c
> +++ b/drivers/clk/meson/a1-pll.c
> @@ -138,6 +138,82 @@ static struct clk_regmap hifi_pll = {
>  	},
>  };
>  
> +static const struct pll_mult_range sys_pll_mult_range = {
> +	.min = 32,
> +	.max = 64,
> +};
> +
> +static const struct reg_sequence sys_pll_init_regs[] = {
> +	{ .reg = ANACTRL_SYSPLL_CTRL1, .def = 0x01800000 },
> +	{ .reg = ANACTRL_SYSPLL_CTRL2, .def = 0x00001100 },
> +	{ .reg = ANACTRL_SYSPLL_CTRL3, .def = 0x10022300 },
> +	{ .reg = ANACTRL_SYSPLL_CTRL4, .def = 0x00300000 },
> +	{ .reg = ANACTRL_SYSPLL_CTRL0, .def = 0x01f18432 },
> +};
> +
> +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,
> +		.init_regs = sys_pll_init_regs,
> +		.init_count = ARRAY_SIZE(sys_pll_init_regs),

Like other 'fishy' flags, I would like a clear comment why this flag is
required so, 2y from now, we will know why it was put there and how we
can deal with it.

> +		.flags = CLK_MESON_PLL_INIT_ONCE,
> +	},
> +	.hw.init = &(struct clk_init_data){
> +		.name = "sys_pll",
> +		.ops = &meson_clk_pll_ops,
> +		.parent_names = (const char *[]){ "syspll_in" },
> +		.num_parents = 1,
> +	},
> +};
> +
> +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,
> +	},
> +};

Unlike the fdivs, this fixed divider is not part of the diagram
describing the syspll clock.

IMO, it could as well be in peripheral controller because it exists
(from what I can see) just testing purposes, to make the sys pll
observable through tst_out or gen_clk.

It also looks less awkward in the bindings.

> +
>  static struct clk_fixed_factor fclk_div2_div = {
>  	.mult = 1,
>  	.div = 2,
> @@ -283,6 +359,8 @@ 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 +371,7 @@ 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
Dmitry Rokosov May 13, 2024, 9:25 p.m. UTC | #2 
On Mon, May 13, 2024 at 02:48:58PM +0200, Jerome Brunet wrote:
> 
> On Fri 10 May 2024 at 12:08, Dmitry Rokosov <ddrokosov@salutedevices.com> wrote:
> 
> > 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@salutedevices.com>
> > ---
> >  drivers/clk/meson/a1-pll.c | 79 ++++++++++++++++++++++++++++++++++++++
> >  drivers/clk/meson/a1-pll.h |  6 +++
> >  2 files changed, 85 insertions(+)
> >
> > diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c
> > index 60b2e53e7e51..af47ba308bbe 100644
> > --- a/drivers/clk/meson/a1-pll.c
> > +++ b/drivers/clk/meson/a1-pll.c
> > @@ -138,6 +138,82 @@ static struct clk_regmap hifi_pll = {
> >  	},
> >  };
> >  
> > +static const struct pll_mult_range sys_pll_mult_range = {
> > +	.min = 32,
> > +	.max = 64,
> > +};
> > +
> > +static const struct reg_sequence sys_pll_init_regs[] = {
> > +	{ .reg = ANACTRL_SYSPLL_CTRL1, .def = 0x01800000 },
> > +	{ .reg = ANACTRL_SYSPLL_CTRL2, .def = 0x00001100 },
> > +	{ .reg = ANACTRL_SYSPLL_CTRL3, .def = 0x10022300 },
> > +	{ .reg = ANACTRL_SYSPLL_CTRL4, .def = 0x00300000 },
> > +	{ .reg = ANACTRL_SYSPLL_CTRL0, .def = 0x01f18432 },
> > +};
> > +
> > +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,
> > +		.init_regs = sys_pll_init_regs,
> > +		.init_count = ARRAY_SIZE(sys_pll_init_regs),
> 
> Like other 'fishy' flags, I would like a clear comment why this flag is
> required so, 2y from now, we will know why it was put there and how we
> can deal with it.
> 

Yep, you are totally correct. The proper comment is required for that.

> > +		.flags = CLK_MESON_PLL_INIT_ONCE,
> > +	},
> > +	.hw.init = &(struct clk_init_data){
> > +		.name = "sys_pll",
> > +		.ops = &meson_clk_pll_ops,
> > +		.parent_names = (const char *[]){ "syspll_in" },
> > +		.num_parents = 1,
> > +	},
> > +};
> > +
> > +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,
> > +	},
> > +};
> 
> Unlike the fdivs, this fixed divider is not part of the diagram
> describing the syspll clock.
> 
> IMO, it could as well be in peripheral controller because it exists
> (from what I can see) just testing purposes, to make the sys pll
> observable through tst_out or gen_clk.
> 
> It also looks less awkward in the bindings.
> 

In any case, it is necessary to introduce a new connection. Instead of
using 'sys_pll_div16', it will now be called 'sys_pll'. I agree with you
that this change will make the code more elegant.

> > +
> >  static struct clk_fixed_factor fclk_div2_div = {
> >  	.mult = 1,
> >  	.div = 2,
> > @@ -283,6 +359,8 @@ 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 +371,7 @@ 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
> 
> 
> -- 
> Jerome
diff mbox series

Patch

diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c
index 60b2e53e7e51..af47ba308bbe 100644
--- a/drivers/clk/meson/a1-pll.c
+++ b/drivers/clk/meson/a1-pll.c
@@ -138,6 +138,82 @@  static struct clk_regmap hifi_pll = {
 	},
 };
 
+static const struct pll_mult_range sys_pll_mult_range = {
+	.min = 32,
+	.max = 64,
+};
+
+static const struct reg_sequence sys_pll_init_regs[] = {
+	{ .reg = ANACTRL_SYSPLL_CTRL1, .def = 0x01800000 },
+	{ .reg = ANACTRL_SYSPLL_CTRL2, .def = 0x00001100 },
+	{ .reg = ANACTRL_SYSPLL_CTRL3, .def = 0x10022300 },
+	{ .reg = ANACTRL_SYSPLL_CTRL4, .def = 0x00300000 },
+	{ .reg = ANACTRL_SYSPLL_CTRL0, .def = 0x01f18432 },
+};
+
+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,
+		.init_regs = sys_pll_init_regs,
+		.init_count = ARRAY_SIZE(sys_pll_init_regs),
+		.flags = CLK_MESON_PLL_INIT_ONCE,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "sys_pll",
+		.ops = &meson_clk_pll_ops,
+		.parent_names = (const char *[]){ "syspll_in" },
+		.num_parents = 1,
+	},
+};
+
+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 +359,8 @@  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 +371,7 @@  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