linux-kernel - Re: [PATCH v7 5/5] clk: meson: c3: add c3 clock peripherals controller driver

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Date: Fri, 03 May 2024 14:20:58 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: Jerome Brunet <jbrunet@...libre.com>
Cc: Xianwei Zhao <xianwei.zhao@...ogic.com>, Rob Herring <robh@...nel.org>,
 linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, Neil  Armstrong
 <neil.armstrong@...aro.org>, Michael Turquette <mturquette@...libre.com>,
 Stephen Boyd <sboyd@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 Kevin Hilman <khilman@...libre.com>, Chuan Liu <chuan.liu@...ogic.com>
Subject: Re: [PATCH v7 5/5] clk: meson: c3: add c3 clock peripherals
 controller driver


On Fri 03 May 2024 at 14:16, Jerome Brunet <jbrunet@...libre.com> wrote:

> On Thu 25 Apr 2024 at 14:28, Xianwei Zhao <xianwei.zhao@...ogic.com> wrote:
>
>> Hi Rob,
>>    Thanks for your review.
>>
>> On 2024/4/25 04:01, Rob Herring wrote:
>>> [ EXTERNAL EMAIL ]
>>> On Wed, Apr 24, 2024 at 01:09:28PM +0800, Xianwei Zhao wrote:
>>>> Add the C3 peripherals clock controller driver in the C3 SoC family.
>>>>
>>>> Co-developed-by: Chuan Liu <chuan.liu@...ogic.com>
>>>> Signed-off-by: Chuan Liu <chuan.liu@...ogic.com>
>>>> Signed-off-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
>>>> ---
>>>>   drivers/clk/meson/Kconfig          |   15 +
>>>>   drivers/clk/meson/Makefile         |    1 +
>>>>   drivers/clk/meson/c3-peripherals.c | 2366 ++++++++++++++++++++++++++++
>>>>   3 files changed, 2382 insertions(+)
>>>>   create mode 100644 drivers/clk/meson/c3-peripherals.c
>>>>
>>>> diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig
>>>> index 9f975a980581..0b85d584910e 100644
>>>> --- a/drivers/clk/meson/Kconfig
>>>> +++ b/drivers/clk/meson/Kconfig
>>>> @@ -142,6 +142,21 @@ config COMMON_CLK_C3_PLL
>>>>          AKA C3. Say Y if you want the board to work, because PLLs are the parent
>>>>          of most peripherals.
>>>>
>>>> +config COMMON_CLK_C3_PERIPHERALS
>>>> +     tristate "Amlogic C3 peripherals clock controller"
>>>> +     depends on ARM64
>>>> +     depends on ARM_SCMI_PROTOCOL
>>> I may have missed it, but I don't see the dependency on SCMI in this
>>> driver.
>>> 
>>
>> Some clock sources for peripherals controller from SCMI module.
>> In previous version, Jerome suggest us the clock  that relevant registers
>> can only be accessed securely is implemented through SCMI.
>>
>
> There is no dependency but you are guranteed to have have problem if
> SCMI is missing because it provides several inputs to this controller.
>
> IMO, this controller should 'imply ARM_SCMI_PROTOCOL'
>
> You have already posted a v8 without it.
> I expect a fix up change on top of v8 if there is no other comment on
> this v8 version. Part of v9 otherwise.
>
>>>> +     depends on COMMON_CLK_SCMI
>>>> +     depends on COMMON_CLK_C3_PLL

Same here - imply, not depends

>>>> +     default y
>>>> +     select COMMON_CLK_MESON_REGMAP
>>>> +     select COMMON_CLK_MESON_DUALDIV
>>>> +     select COMMON_CLK_MESON_CLKC_UTILS
>>>> +     help
>>>> +       Support for the Peripherals clock controller on Amlogic C302X and
>>>> +       C308L devices, AKA C3. Say Y if you want the peripherals clock to
>>>> +       work.
>>>> +
>>>>   config COMMON_CLK_G12A
>>>>        tristate "G12 and SM1 SoC clock controllers support"
>>>>        depends on ARM64
>>>> diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
>>>> index 4420af628b31..20ad9482c892 100644
>>>> --- a/drivers/clk/meson/Makefile
>>>> +++ b/drivers/clk/meson/Makefile
>>>> @@ -20,6 +20,7 @@ obj-$(CONFIG_COMMON_CLK_AXG_AUDIO) += axg-audio.o
>>>>   obj-$(CONFIG_COMMON_CLK_A1_PLL) += a1-pll.o
>>>>   obj-$(CONFIG_COMMON_CLK_A1_PERIPHERALS) += a1-peripherals.o
>>>>   obj-$(CONFIG_COMMON_CLK_C3_PLL) += c3-pll.o
>>>> +obj-$(CONFIG_COMMON_CLK_C3_PERIPHERALS) += c3-peripherals.o
>>>>   obj-$(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 meson8-ddr.o
>>>> diff --git a/drivers/clk/meson/c3-peripherals.c b/drivers/clk/meson/c3-peripherals.c
>>>> new file mode 100644
>>>> index 000000000000..0f834ced0ee9
>>>> --- /dev/null
>>>> +++ b/drivers/clk/meson/c3-peripherals.c
>>>> @@ -0,0 +1,2366 @@
>>>> +// SPDX-License-Identifier: GPL-2.0-only
>>>> +/*
>>>> + * Amlogic C3 Peripherals Clock Controller Driver
>>>> + *
>>>> + * Copyright (c) 2023 Amlogic, inc.
>>>> + * Author: Chuan Liu <chuan.liu@...ogic.com>
>>>> + */
>>>> +
>>>> +#include <linux/clk-provider.h>
>>>> +#include <linux/of_device.h>
>>> I don't think you need this header.
>>> 
>>
>> Yes, I will fix it with c3-pll.c.
>>
>>>> +#include <linux/platform_device.h>
>>>> +#include "clk-regmap.h"
>>>> +#include "clk-dualdiv.h"
>>>> +#include "meson-clkc-utils.h"
>>>> +#include <dt-bindings/clock/amlogic,c3-peripherals-clkc.h>


-- 
Jerome