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Message-ID: <1jedrqyd3w.fsf@starbuckisacylon.baylibre.com>
Date: Thu, 19 Jan 2023 12:20:39 +0100
From: Jerome Brunet <jbrunet@...libre.com>
To: Yu Tu <yu.tu@...ogic.com>, linux-clk@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
Neil Armstrong <neil.armstrong@...aro.org>,
Kevin Hilman <khilman@...libre.com>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: "kelvin . zhang" <Kelvin.Zhang@...ogic.com>,
"qi . duan" <qi.duan@...ogic.com>
Subject: Re: [PATCH V6 2/3] clk: meson: S4: add support for Amlogic S4 SoC
PLL clock driver
On Mon 16 Jan 2023 at 15:42, Yu Tu <yu.tu@...ogic.com> wrote:
> Add the S4 PLL clock controller driver in the s4 SoC family.
>
> Signed-off-by: Yu Tu <yu.tu@...ogic.com>
> ---
[...]
> +
> +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 ?
> + .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
> + */
> +#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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