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

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Message-ID: <1jle4r3x5l.fsf@starbuckisacylon.baylibre.com>
Date: Fri, 03 May 2024 14:16:17 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: Xianwei Zhao <xianwei.zhao@...ogic.com>
Cc: 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>, Jerome Brunet
 <jbrunet@...libre.com>, 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 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
>>> +     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