Re: [PATCH V6 2/3] clk: meson: S4: add support for Amlogic S4 SoC PLL clock driver

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On 2023/1/20 17:43, Jerome Brunet wrote:
[ EXTERNAL EMAIL ]


On Fri 20 Jan 2023 at 10:58, Yu Tu <yu.tu@xxxxxxxxxxx> wrote:

Hi Jerome,

On 2023/1/19 19:20, Jerome Brunet wrote:
[ EXTERNAL EMAIL ]
On Mon 16 Jan 2023 at 15:42, Yu Tu <yu.tu@xxxxxxxxxxx> wrote:

Add the S4 PLL clock controller driver in the s4 SoC family.

Signed-off-by: Yu Tu <yu.tu@xxxxxxxxxxx>
---
[...]

+
+static struct clk_regmap s4_fclk_div2 = {
+	.data = &(struct clk_regmap_gate_data){
+		.offset = ANACTRL_FIXPLL_CTRL1,
+		.bit_idx = 24,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "fclk_div2",
+		.ops = &clk_regmap_gate_ro_ops,
On the previous SoC, these fixed divider gate were not read-only.
They are marked as critical when necessary, with the appropriate
comment.
Why is it different on the s4 ?

In fact, this part of the SOC is no different from the previous G12a/b and
so on.

I remember that my first version was made according to G12A, and I changed
this way under your suggestion.

Maybe you were busy and forgot. For me, this mode and the previous g12a
mode function is ok. I can do either. So now how do you decide to go that
way?

No I did not forgot.
I told you that cannot put CRITICAL (or IGNORE_USED) without explaining
why. I stand by this. Same goes for RO ops.


I will add an explanation.



+		.parent_hws = (const struct clk_hw *[]) {
+			&s4_fclk_div2_div.hw
+		},
+		.num_parents = 1,
+	},
+};
+
[...]

+#ifndef __MESON_S4_PLL_H__
+#define __MESON_S4_PLL_H__
+
+/* ANA_CTRL - Registers
+ * REG_BASE:  REGISTER_BASE_ADDR = 0xfe008000
This multi-line comment style is wrong in clk/
REG_BASE is not used so I'm not sure this is useful

I will remove REG_BASE and  change this format in next version.


+ */
+#define ANACTRL_FIXPLL_CTRL0                       0x040
+#define ANACTRL_FIXPLL_CTRL1                       0x044
+#define ANACTRL_FIXPLL_CTRL2                       0x048
+#define ANACTRL_FIXPLL_CTRL3                       0x04c
+#define ANACTRL_FIXPLL_CTRL4                       0x050
+#define ANACTRL_FIXPLL_CTRL5                       0x054
+#define ANACTRL_FIXPLL_CTRL6                       0x058
+#define ANACTRL_FIXPLL_STS                         0x05c
+#define ANACTRL_GP0PLL_CTRL0                       0x080
+#define ANACTRL_GP0PLL_CTRL1                       0x084
+#define ANACTRL_GP0PLL_CTRL2                       0x088
+#define ANACTRL_GP0PLL_CTRL3                       0x08c
+#define ANACTRL_GP0PLL_CTRL4                       0x090
+#define ANACTRL_GP0PLL_CTRL5                       0x094
+#define ANACTRL_GP0PLL_CTRL6                       0x098
+#define ANACTRL_GP0PLL_STS                         0x09c
+#define ANACTRL_HIFIPLL_CTRL0                      0x100
+#define ANACTRL_HIFIPLL_CTRL1                      0x104
+#define ANACTRL_HIFIPLL_CTRL2                      0x108
+#define ANACTRL_HIFIPLL_CTRL3                      0x10c
+#define ANACTRL_HIFIPLL_CTRL4                      0x110
+#define ANACTRL_HIFIPLL_CTRL5                      0x114
+#define ANACTRL_HIFIPLL_CTRL6                      0x118
+#define ANACTRL_HIFIPLL_STS                        0x11c
+#define ANACTRL_MPLL_CTRL0                         0x180
+#define ANACTRL_MPLL_CTRL1                         0x184
+#define ANACTRL_MPLL_CTRL2                         0x188
+#define ANACTRL_MPLL_CTRL3                         0x18c
+#define ANACTRL_MPLL_CTRL4                         0x190
+#define ANACTRL_MPLL_CTRL5                         0x194
+#define ANACTRL_MPLL_CTRL6                         0x198
+#define ANACTRL_MPLL_CTRL7                         0x19c
+#define ANACTRL_MPLL_CTRL8                         0x1a0
+#define ANACTRL_MPLL_STS                           0x1a4
+#define ANACTRL_HDMIPLL_CTRL0                      0x1c0
+#define ANACTRL_HDMIPLL_CTRL1                      0x1c4
+#define ANACTRL_HDMIPLL_CTRL2                      0x1c8
+#define ANACTRL_HDMIPLL_CTRL3                      0x1cc
+#define ANACTRL_HDMIPLL_CTRL4                      0x1d0
+#define ANACTRL_HDMIPLL_CTRL5                      0x1d4
+#define ANACTRL_HDMIPLL_CTRL6                      0x1d8
+#define ANACTRL_HDMIPLL_STS                        0x1dc
+#define ANACTRL_HDMIPLL_VLOCK                      0x1e4
+
+/*
+ * CLKID index values
+ *
+ * These indices are entirely contrived and do not map onto the hardware.
+ * It has now been decided to expose everything by default in the DT header:
+ * include/dt-bindings/clock/axg-clkc.h. Only the clocks ids we don't want
+ * to expose, such as the internal muxes and dividers of composite clocks,
+ * will remain defined here.
+ */
+#define CLKID_FIXED_PLL_DCO		0
+#define CLKID_FCLK_DIV2_DIV		2
+#define CLKID_FCLK_DIV3_DIV		4
+#define CLKID_FCLK_DIV4_DIV		6
+#define CLKID_FCLK_DIV5_DIV		8
+#define CLKID_FCLK_DIV7_DIV		10
+#define CLKID_FCLK_DIV2P5_DIV		12
+#define CLKID_GP0_PLL_DCO		14
+#define CLKID_HIFI_PLL_DCO		16
+#define CLKID_HDMI_PLL_DCO		18
+#define CLKID_HDMI_PLL_OD		19
+#define CLKID_MPLL_50M_DIV		21
+#define CLKID_MPLL_PREDIV		23
+#define CLKID_MPLL0_DIV			24
+#define CLKID_MPLL1_DIV			26
+#define CLKID_MPLL2_DIV			28
+#define CLKID_MPLL3_DIV			30
+
+#define NR_PLL_CLKS			32
+/* include the CLKIDs that have been made part of the DT binding */
+#include <dt-bindings/clock/amlogic,s4-pll-clkc.h>
+
+#endif /* __MESON_S4_PLL_H__ */





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