linux-kernel - Re: [PATCH V5 1/4] clk: meson: S4: add support for Amlogic S4 SoC PLL clock driver and bindings

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Message-ID: <92b570ea-3ddc-8e91-5a7a-ed601bb7c02c@amlogic.com>
Date:   Wed, 23 Nov 2022 19:16:06 +0800
From:   Yu Tu <yu.tu@...ogic.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <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>,
        Jerome Brunet <jbrunet@...libre.com>,
        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@...ogic.com>
Subject: Re: [PATCH V5 1/4] clk: meson: S4: add support for Amlogic S4 SoC PLL
 clock driver and bindings

Hi Krzysztof,
	Thank you for your reply.

On 2022/11/23 18:08, Krzysztof Kozlowski wrote:
> [ EXTERNAL EMAIL ]
> 
> On 23/11/2022 03:13, Yu Tu wrote:
>> Add the S4 PLL clock controller found and bindings in the s4 SoC family.
>>
>> Signed-off-by: Yu Tu <yu.tu@...ogic.com>
>> ---
>>   .../bindings/clock/amlogic,s4-pll-clkc.yaml   |  51 +
> 
> This is v5 and still bindings are here? Bindings are always separate
> patches. Use subject prefixes matching the subsystem (git log --oneline
> -- ...).
> 
> And this was split, wasn't it? What happened here?!?

Put bindings and clock driver patch together from Jerome. Maybe you can 
read this chat history.
https://lore.kernel.or/all/1jy1v6z14n.fsf@starbuckisacylon.baylibre.com/

> 
> 
>>   MAINTAINERS                                   |   1 +
>>   drivers/clk/meson/Kconfig                     |  13 +
>>   drivers/clk/meson/Makefile                    |   1 +
>>   drivers/clk/meson/s4-pll.c                    | 875 ++++++++++++++++++
>>   drivers/clk/meson/s4-pll.h                    |  88 ++
>>   .../dt-bindings/clock/amlogic,s4-pll-clkc.h   |  30 +
>>   7 files changed, 1059 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/clock/amlogic,s4-pll-clkc.yaml
>>   create mode 100644 drivers/clk/meson/s4-pll.c
>>   create mode 100644 drivers/clk/meson/s4-pll.h
>>   create mode 100644 include/dt-bindings/clock/amlogic,s4-pll-clkc.h
>>
>> diff --git a/Documentation/devicetree/bindings/clock/amlogic,s4-pll-clkc.yaml b/Documentation/devicetree/bindings/clock/amlogic,s4-pll-clkc.yaml
>> new file mode 100644
>> index 000000000000..fd517e8ef14f
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/clock/amlogic,s4-pll-clkc.yaml
>> @@ -0,0 +1,51 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/clock/amlogic,s4-pll-clkc.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Amlogic Meson S serials PLL Clock Controller
>> +
>> +maintainers:
>> +  - Neil Armstrong <narmstrong@...libre.com>
>> +  - Jerome Brunet <jbrunet@...libre.com>
>> +  - Yu Tu <yu.hu@...ogic.com>
>> +
> One blank line.

  I will delete this, on next version patch.

> 
>> +
>> +properties:
>> +  compatible:
>> +    const: amlogic,s4-pll-clkc
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 1
>> +
>> +  clock-names:
>> +    items:
>> +      - const: xtal
>> +
>> +  "#clock-cells":
>> +    const: 1
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +  - clock-names
>> +  - "#clock-cells"
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    clkc_pll: clock-controller@...08000 {
>> +      compatible = "amlogic,s4-pll-clkc";
>> +      reg = <0xfe008000 0x1e8>;
>> +      clocks = <&xtal>;
>> +      clock-names = "xtal";
>> +      #clock-cells = <1>;
>> +    };
> 
> 
>> +#endif /* __MESON_S4_PLL_H__ */
>> diff --git a/include/dt-bindings/clock/amlogic,s4-pll-clkc.h b/include/dt-bindings/clock/amlogic,s4-pll-clkc.h
>> new file mode 100644
>> index 000000000000..345f87023886
>> --- /dev/null
>> +++ b/include/dt-bindings/clock/amlogic,s4-pll-clkc.h
> 
> This belongs to bindings patch, not driver.
> 
>> @@ -0,0 +1,30 @@
>> +/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
>> +/*
>> + * Copyright (c) 2021 Amlogic, Inc. All rights reserved.
>> + * Author: Yu Tu <yu.tu@...ogic.com>
>> + */
>> +
>> +#ifndef _DT_BINDINGS_CLOCK_AMLOGIC_S4_PLL_CLKC_H
>> +#define _DT_BINDINGS_CLOCK_AMLOGIC_S4_PLL_CLKC_H
>> +
>> +/*
>> + * CLKID index values
>> + */
>> +
>> +#define CLKID_FIXED_PLL			1
>> +#define CLKID_FCLK_DIV2			3
> 
> Indexes start from 0 and are incremented by 1. Not by 2.
> 
> NAK.

I remember Jerome discussing this with you.You can look at this 
submission history.
https://lore.kernel.org/all/c088e01c-0714-82be-8347-6140daf56640@linaro.org/

> 
> Best regards,
> Krzysztof
> 
> .