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Date: Wed, 18 Dec 2019 15:20:48 +0800
From: Jian Hu <jian.hu@...ogic.com>
To: Jerome Brunet <jbrunet@...libre.com>,
Neil Armstrong <narmstrong@...libre.com>
CC: Kevin Hilman <khilman@...libre.com>, Rob Herring <robh@...nel.org>,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Qiufang Dai <qiufang.dai@...ogic.com>,
Jianxin Pan <jianxin.pan@...ogic.com>,
Victor Wan <victor.wan@...ogic.com>,
Chandle Zou <chandle.zou@...ogic.com>,
<linux-clk@...r.kernel.org>, <linux-amlogic@...ts.infradead.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 6/6] clk: meson: a1: add support for Amlogic A1
Peripheral clock driver
On 2019/12/12 19:01, Jerome Brunet wrote:
>
> On Fri 06 Dec 2019 at 08:40, Jian Hu <jian.hu@...ogic.com> wrote:
>
>> Add Amlogic Meson A1 peripheral clock driver, it depends
>> on the A1 PLL driver.
>>
>> Signed-off-by: Jian Hu <jian.hu@...ogic.com>
>> ---
>> drivers/clk/meson/Kconfig | 10 +
>> drivers/clk/meson/Makefile | 1 +
>> drivers/clk/meson/a1.c | 2246 ++++++++++++++++++++++++++++++++++++
>> drivers/clk/meson/a1.h | 120 ++
>> 4 files changed, 2377 insertions(+)
>> create mode 100644 drivers/clk/meson/a1.c
>> create mode 100644 drivers/clk/meson/a1.h
>>
>> diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig
>> index 14e7936ae18e..d6b2b51316b7 100644
>> --- a/drivers/clk/meson/Kconfig
>> +++ b/drivers/clk/meson/Kconfig
>> @@ -103,6 +103,16 @@ config COMMON_CLK_A1_PLL
>> Support for the PLL clock controller on Amlogic A113L device,
>> aka a1. Say Y if you want PLL to work.
>>
>> +config COMMON_CLK_A1
>> + bool
>> + depends on ARCH_MESON
>> + select COMMON_CLK_MESON_EE_CLKC
>> + select COMMON_CLK_MESON_DUALDIV
>> + select COMMON_CLK_MESON_REGMAP
>> + help
>> + Support for the Peripheral clock controller on Amlogic A113L device,
>> + aka a1. Say Y if you want Peripherals to work.
>> +
>> config COMMON_CLK_G12A
>> bool
>> depends on ARCH_MESON
>> diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
>> index 71d3b8e6fb8a..0f3890030118 100644
>> --- a/drivers/clk/meson/Makefile
>> +++ b/drivers/clk/meson/Makefile
>> @@ -17,6 +17,7 @@ obj-$(CONFIG_COMMON_CLK_MESON_VID_PLL_DIV) += vid-pll-div.o
>> obj-$(CONFIG_COMMON_CLK_AXG) += axg.o axg-aoclk.o
>> obj-$(CONFIG_COMMON_CLK_AXG_AUDIO) += axg-audio.o
>> obj-$(CONFIG_COMMON_CLK_A1_PLL) += a1-pll.o
>> +obj-$(CONFIG_COMMON_CLK_A1) += a1.o
>> obj-$(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
>> diff --git a/drivers/clk/meson/a1.c b/drivers/clk/meson/a1.c
>> new file mode 100644
>> index 000000000000..76fa5a9e74a5
>> --- /dev/null
>> +++ b/drivers/clk/meson/a1.c
>> @@ -0,0 +1,2246 @@
>> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>> +/*
>> + * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
>> + * Author: Jian Hu <jian.hu@...ogic.com>
>> + */
>> +
>> +#include <linux/clk-provider.h>
>> +#include <linux/of_device.h>
>> +#include <linux/platform_device.h>
>> +#include "a1.h"
>> +#include "clk-dualdiv.h"
>> +#include "meson-eeclk.h"
>> +
>> +/* PLLs clock in gates, its parent is xtal */
>> +static struct clk_regmap a1_xtal_clktree = {
>> + .data = &(struct clk_regmap_gate_data){
>> + .offset = SYS_OSCIN_CTRL,
>> + .bit_idx = 0,
>> + },
>> + .hw.init = &(struct clk_init_data) {
>> + .name = "xtal_clktree",
>> + .ops = &clk_regmap_gate_ro_ops,
>> + .parent_data = &(const struct clk_parent_data) {
>> + .fw_name = "xtal",
>> + },
>> + .num_parents = 1,
>> + },
>> +};
>> +
>> +static struct clk_regmap a1_xtal_fixpll = {
>> + .data = &(struct clk_regmap_gate_data){
>> + .offset = SYS_OSCIN_CTRL,
>> + .bit_idx = 1,
>> + },
>> + .hw.init = &(struct clk_init_data) {
>> + .name = "xtal_fixpll",
>> + .ops = &clk_regmap_gate_ro_ops,
>> + .parent_data = &(const struct clk_parent_data) {
>> + .fw_name = "xtal",
>> + },
>> + .num_parents = 1,
>> + },
>> +};
>> +
>> +static struct clk_regmap a1_xtal_usb_phy = {
>> + .data = &(struct clk_regmap_gate_data){
>> + .offset = SYS_OSCIN_CTRL,
>> + .bit_idx = 2,
>> + },
>> + .hw.init = &(struct clk_init_data) {
>> + .name = "xtal_usb_phy",
>> + .ops = &clk_regmap_gate_ops,
>> + .parent_data = &(const struct clk_parent_data) {
>> + .fw_name = "xtal",
>> + },
>> + .num_parents = 1,
>> + },
>> +};
>> +
>> +static struct clk_regmap a1_xtal_usb_ctrl = {
>> + .data = &(struct clk_regmap_gate_data){
>> + .offset = SYS_OSCIN_CTRL,
>> + .bit_idx = 3,
>> + },
>> + .hw.init = &(struct clk_init_data) {
>> + .name = "xtal_usb_ctrl",
>> + .ops = &clk_regmap_gate_ops,
>> + .parent_data = &(const struct clk_parent_data) {
>> + .fw_name = "xtal",
>> + },
>> + .num_parents = 1,
>> + },
>> +};
>> +
>> +static struct clk_regmap a1_xtal_hifipll = {
>> + .data = &(struct clk_regmap_gate_data){
>> + .offset = SYS_OSCIN_CTRL,
>> + .bit_idx = 4,
>> + },
>> + .hw.init = &(struct clk_init_data) {
>> + .name = "xtal_hifipll",
>> + .ops = &clk_regmap_gate_ops,
>> + .parent_data = &(const struct clk_parent_data) {
>> + .fw_name = "xtal",
>> + },
>> + .num_parents = 1,
>> + },
>> +};
>> +
>> +static struct clk_regmap a1_xtal_syspll = {
>> + .data = &(struct clk_regmap_gate_data){
>> + .offset = SYS_OSCIN_CTRL,
>> + .bit_idx = 5,
>> + },
>> + .hw.init = &(struct clk_init_data) {
>> + .name = "xtal_syspll",
>> + .ops = &clk_regmap_gate_ops,
>> + .parent_data = &(const struct clk_parent_data) {
>> + .fw_name = "xtal",
>> + },
>> + .num_parents = 1,
>> + },
>> +};
>> +
>> +static struct clk_regmap a1_xtal_dds = {
>> + .data = &(struct clk_regmap_gate_data){
>> + .offset = SYS_OSCIN_CTRL,
>> + .bit_idx = 6,
>> + },
>> + .hw.init = &(struct clk_init_data) {
>> + .name = "xtal_dds",
>> + .ops = &clk_regmap_gate_ops,
>> + .parent_data = &(const struct clk_parent_data) {
>> + .fw_name = "xtal",
>> + },
>> + .num_parents = 1,
>> + },
>> +};
>> +
>> +static const struct clk_parent_data sys_clk_parents[] = {
>> + { .fw_name = "xtal" },
>> + { .fw_name = "fclk_div2"},
>> + { .fw_name = "fclk_div3"},
>> + { .fw_name = "fclk_div5"},
>> +};
>> +
>> +static struct clk_regmap a1_sys_b_sel = {
>> + .data = &(struct clk_regmap_mux_data){
>> + .offset = SYS_CLK_CTRL0,
>> + .mask = 0x7,
>> + .shift = 26,
>> + },
>> + .hw.init = &(struct clk_init_data){
>> + .name = "sys_b_sel",
>> + .ops = &clk_regmap_mux_ro_ops,
>> + .parent_data = sys_clk_parents,
>> + .num_parents = ARRAY_SIZE(sys_clk_parents),
>> + },
>> +};
>> +
>> +static struct clk_regmap a1_sys_b_div = {
>> + .data = &(struct clk_regmap_div_data){
>> + .offset = SYS_CLK_CTRL0,
>> + .shift = 16,
>> + .width = 10,
>> + },
>> + .hw.init = &(struct clk_init_data){
>> + .name = "sys_b_div",
>> + .ops = &clk_regmap_divider_ops,
>> + .parent_hws = (const struct clk_hw *[]) {
>> + &a1_sys_b_sel.hw
>> + },
>> + .num_parents = 1,
>> + .flags = CLK_SET_RATE_PARENT,
>> + },
>> +};
>> +
>> +static struct clk_regmap a1_sys_b = {
>> + .data = &(struct clk_regmap_gate_data){
>> + .offset = SYS_CLK_CTRL0,
>> + .bit_idx = 29,
>> + },
>> + .hw.init = &(struct clk_init_data) {
>> + .name = "sys_b",
>> + .ops = &clk_regmap_gate_ops,
>> + .parent_hws = (const struct clk_hw *[]) {
>> + &a1_sys_b_div.hw
>> + },
>> + .num_parents = 1,
>> + /*
>> + * This clock is used by APB bus which setted in Romcode
>> + * and is required by the platform to operate correctly.
>> + * Until the following condition are met, we need this clock to
>> + * be marked as critical:
>> + * a) Mark the clock used by a firmware resource, if possible
>> + * b) CCF has a clock hand-off mechanism to make the sure the
>> + * clock stays on until the proper driver comes along
>> + */
>> + .flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
>> + },
>> +};
>> +
>> +static struct clk_regmap a1_sys_a_sel = {
>> + .data = &(struct clk_regmap_mux_data){
>> + .offset = SYS_CLK_CTRL0,
>> + .mask = 0x7,
>> + .shift = 10,
>> + },
>> + .hw.init = &(struct clk_init_data){
>> + .name = "sys_a_sel",
>> + .ops = &clk_regmap_mux_ro_ops,
>> + .parent_data = sys_clk_parents,
>> + .num_parents = ARRAY_SIZE(sys_clk_parents),
>> + },
>> +};
>> +
>> +static struct clk_regmap a1_sys_a_div = {
>> + .data = &(struct clk_regmap_div_data){
>> + .offset = SYS_CLK_CTRL0,
>> + .shift = 0,
>> + .width = 10,
>> + },
>> + .hw.init = &(struct clk_init_data){
>> + .name = "sys_a_div",
>> + .ops = &clk_regmap_divider_ops,
>> + .parent_hws = (const struct clk_hw *[]) {
>> + &a1_sys_a_sel.hw
>> + },
>> + .num_parents = 1,
>> + .flags = CLK_SET_RATE_PARENT,
>> + },
>> +};
>> +
>> +static struct clk_regmap a1_sys_a = {
>> + .data = &(struct clk_regmap_gate_data){
>> + .offset = SYS_CLK_CTRL0,
>> + .bit_idx = 13,
>> + },
>> + .hw.init = &(struct clk_init_data) {
>> + .name = "sys_a",
>> + .ops = &clk_regmap_gate_ops,
>> + .parent_hws = (const struct clk_hw *[]) {
>> + &a1_sys_a_div.hw
>> + },
>> + .num_parents = 1,
>> + /*
>> + * This clock is used by APB bus which setted in Romcode
>> + * and is required by the platform to operate correctly.
>
> #1 It weird that both sys_a and sys_b are critical, Only the leaf needs
> to be critical which, AFAICT, is a1_sys_clk.
>
> #2 Like on the other controller: What the clock is needed for needs is
> needed for for each critical clock, but the explanation below needs to
> appear only once and can be refered to afterward.
>
OK, I will remove the flag CLK_IS_CRITICAL for a1_sys_a and a1_sys_b.
And add it for a1_sys_clk.
>> + * Until the following condition are met, we need this clock to
>> + * be marked as critical:
>> + * a) Mark the clock used by a firmware resource, if possible
>> + * b) CCF has a clock hand-off mechanism to make the sure the
>> + * clock stays on until the proper driver comes along
>> + */
>> + .flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
>> + },
>> +};
>> +
>> +static struct clk_regmap a1_sys_clk = {
>> + .data = &(struct clk_regmap_mux_data){
>> + .offset = SYS_CLK_CTRL0,
>> + .mask = 0x1,
>> + .shift = 31,
>> + },
>> + .hw.init = &(struct clk_init_data){
>> + .name = "sys_clk",
>> + .ops = &clk_regmap_mux_ro_ops,
>> + .parent_hws = (const struct clk_hw *[]) {
>> + &a1_sys_a.hw, &a1_sys_b.hw,
>> + },
>> + .num_parents = 2,
>> + .flags = CLK_SET_RATE_PARENT,
>> + },
>> +};
>> +
[...]
> .
>
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