Subject: Re: [PATCH 2/2] clk: meson: a1: add support for Amlogic A1 clock driver

From: Stephen Boyd <[email-masked]>
Date: Wed, 25 Sep 2019 06:12:31 -0700

Quoting Jian Hu (2019-09-25 04:44:48)
> The Amlogic A1 clock includes three parts:
> peripheral clocks, pll clocks, CPU clocks.
> sys pll and CPU clocks will be sent in next patch.
> 
> Unlike the previous series, there is no EE/AO domain
> in A1 CLK controllers.
> 
> Signed-off-by: Jian Hu <[email-masked]>
> Signed-off-by: Jianxin Pan <[email-masked]>

This second name didn't send the patch. Please follow the signoff
procedures documented in Documentation/process/submitting-patches.rst

> diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
> index 16d7614..a48f67d 100644
> --- a/arch/arm64/Kconfig.platforms
> +++ b/arch/arm64/Kconfig.platforms
> @@ -138,6 +138,7 @@ config ARCH_MESON
>         select COMMON_CLK_AXG
>         select COMMON_CLK_G12A
>         select MESON_IRQ_GPIO
> +       select COMMON_CLK_A1

Sort?

>         help
>           This enables support for the arm64 based Amlogic SoCs
>           such as the s905, S905X/D, S912, A113X/D or S905X/D2
> diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig
> index dabeb43..e6cb4c3 100644
> --- a/drivers/clk/meson/Kconfig
> +++ b/drivers/clk/meson/Kconfig
> @@ -107,3 +107,13 @@ config COMMON_CLK_G12A
>         help
>           Support for the clock controller on Amlogic S905D2, S905X2 and S905Y2
>           devices, aka g12a. Say Y if you want peripherals to work.
> +
> +config COMMON_CLK_A1

Probably should be placed somewhere alphabetically in this file?

> +       bool
> +       depends on ARCH_MESON
> +       select COMMON_CLK_MESON_REGMAP
> +       select COMMON_CLK_MESON_DUALDIV
> +       select COMMON_CLK_MESON_PLL
> +       help
> +         Support for the clock controller on Amlogic A113L device,
> +         aka a1. Say Y if you want peripherals to work.
> diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
> index 3939f21..6be3a8f 100644
> --- a/drivers/clk/meson/Makefile
> +++ b/drivers/clk/meson/Makefile
> @@ -19,3 +19,4 @@ obj-$(CONFIG_COMMON_CLK_AXG_AUDIO) += axg-audio.o
>  obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o
>  obj-$(CONFIG_COMMON_CLK_G12A) += g12a.o g12a-aoclk.o
>  obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o
> +obj-$(CONFIG_COMMON_CLK_A1) += a1.o

I would guess this should be sorted on Kconfig name in this file?

> diff --git a/drivers/clk/meson/a1.c b/drivers/clk/meson/a1.c
> new file mode 100644
> index 0000000..26edae0f
> --- /dev/null
> +++ b/drivers/clk/meson/a1.c
> @@ -0,0 +1,2617 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
> + */
> +
> +#include <linux/clk-provider.h>
> +#include <linux/init.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/of_address.h>
> +#include "clk-mpll.h"
> +#include "clk-pll.h"
> +#include "clk-regmap.h"
> +#include "vid-pll-div.h"
> +#include "clk-dualdiv.h"
> +#include "meson-eeclk.h"
> +#include "a1.h"
> +
[...]
> +
> +/*
> + * The Meson A1 HIFI PLL is 614.4M, it requires
> + * a strict register sequence to enable the PLL.
> + * set meson_clk_pcie_pll_ops as its ops

Please remove this last line as it's obvious from the code what ops are
used.

> + */
> +static struct clk_regmap a1_hifi_pll = {
> +       .data = &(struct meson_clk_pll_data){
> +               .en = {
> +                       .reg_off = ANACTRL_HIFIPLL_CTRL0,
> +                       .shift   = 28,
> +                       .width   = 1,
> +               },
> +               .m = {
> +                       .reg_off = ANACTRL_HIFIPLL_CTRL0,
> +                       .shift   = 0,
> +                       .width   = 8,
> +               },
> +               .n = {
> +                       .reg_off = ANACTRL_HIFIPLL_CTRL0,
> +                       .shift   = 10,
> +                       .width   = 5,
> +               },
> +               .frac = {
> +                       .reg_off = ANACTRL_HIFIPLL_CTRL1,
> +                       .shift   = 0,
> +                       .width   = 19,
> +               },
> +               .l = {
> +                       .reg_off = ANACTRL_HIFIPLL_STS,
> +                       .shift   = 31,
> +                       .width   = 1,
> +               },
> +               .table = a1_hifi_pll_params_table,
> +               .init_regs = a1_hifi_init_regs,
> +               .init_count = ARRAY_SIZE(a1_hifi_init_regs),
> +       },
> +       .hw.init = &(struct clk_init_data){
> +               .name = "hifi_pll",
> +               .ops = &meson_clk_pcie_pll_ops,
> +               .parent_hws = (const struct clk_hw *[]) {
> +                       &a1_xtal_hifipll.hw
> +               },
> +               .num_parents = 1,
> +       },
> +};
> +
[..]
> +
> +static struct clk_regmap a1_fclk_div2 = {
> +       .data = &(struct clk_regmap_gate_data){
> +               .offset = ANACTRL_FIXPLL_CTRL0,
> +               .bit_idx = 21,
> +       },
> +       .hw.init = &(struct clk_init_data){
> +               .name = "fclk_div2",
> +               .ops = &clk_regmap_gate_ops,
> +               .parent_hws = (const struct clk_hw *[]) {
> +                       &a1_fclk_div2_div.hw
> +               },
> +               .num_parents = 1,
> +               /*
> +                * add CLK_IS_CRITICAL flag to avoid being disabled by clk core
> +                * or its children clocks.

This comment is useless. Please replace it with an actual reason for
keeping the clk on instead of describing what the flag does.

> +                */
> +               .flags = CLK_IS_CRITICAL,
> +       },
> +};
> +
[..]
> +static struct clk_regmap a1_dmc = {
> +       .data = &(struct clk_regmap_gate_data){
> +               .offset = DMC_CLK_CTRL,
> +               .bit_idx = 8,
> +       },
> +       .hw.init = &(struct clk_init_data) {
> +               .name = "dmc",
> +               .ops = &clk_regmap_gate_ops,
> +               .parent_hws = (const struct clk_hw *[]) {
> +                       &a1_dmc_sel2.hw
> +               },
> +               .num_parents = 1,
> +               /*
> +                * add CLK_IGNORE_UNUSED to avoid hangup
> +                * DDR clock should not change at runtime
> +                */
> +               .flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,

So not CLK_IS_CRITICAL?

> +       },
> +};
> +
[...]
> +
> +/*
> + * cpu clock register base address is 0xfd000080
> + */
> +static struct clk_regmap *const a1_cpu_clk_regmaps[] = {
> +       /* TODO */

Can it be done?

> +};

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