linux-kernel - Re: [PATCH v4 1/6] dt-bindings: clock: qcom: Add MSM8937 Global Clock Controller

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Message-ID: <1b8228df-e007-4ecf-92b7-d4833efbc765@kernel.org>
Date: Mon, 17 Mar 2025 16:10:13 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Barnabás Czémán <barnabas.czeman@...nlining.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Stephan Gerhold <stephan@...hold.net>,
 Otto Pflüger <otto.pflueger@...cue.de>,
 Linus Walleij <linus.walleij@...aro.org>, Lee Jones <lee@...nel.org>,
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
 Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
 Robin Murphy <robin.murphy@....com>, Konrad Dybcio <konradybcio@...nel.org>,
 Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
 Abhinav Kumar <quic_abhinavk@...cinc.com>,
 Marijn Suijten <marijn.suijten@...ainline.org>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Dmitry Baryshkov <lumag@...nel.org>, linux-arm-msm@...r.kernel.org,
 linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
 iommu@...ts.linux.dev, dri-devel@...ts.freedesktop.org,
 freedreno@...ts.freedesktop.org, phone-devel@...r.kernel.org,
 ~postmarketos/upstreaming@...ts.sr.ht, linux@...nlining.org
Subject: Re: [PATCH v4 1/6] dt-bindings: clock: qcom: Add MSM8937 Global Clock
 Controller

On 17/03/2025 10:57, Barnabás Czémán wrote:
> 
> 
> On March 17, 2025 10:17:46 AM GMT+01:00, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>> On Sat, Mar 15, 2025 at 03:57:35PM +0100, Barnabás Czémán wrote:
>>> Add device tree bindings for the global clock controller on Qualcomm
>>> MSM8937 platform.
>>>
>>> Signed-off-by: Barnabás Czémán <barnabas.czeman@...nlining.org>
>>> ---
>>>  .../bindings/clock/qcom,gcc-msm8937.yaml           | 75 ++++++++++++++++++++++
>>>  include/dt-bindings/clock/qcom,gcc-msm8917.h       | 17 +++++
>>>  2 files changed, 92 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/clock/qcom,gcc-msm8937.yaml b/Documentation/devicetree/bindings/clock/qcom,gcc-msm8937.yaml
>>> new file mode 100644
>>> index 0000000000000000000000000000000000000000..3c3f6756048e195671f542b3a6cd09057558eafa
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/clock/qcom,gcc-msm8937.yaml
>>> @@ -0,0 +1,75 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/clock/qcom,gcc-msm8937.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Qualcomm Global Clock & Reset Controller on MSM8937
>>> +
>>> +maintainers:
>>> +  - Barnabas Czeman <barnabas.czeman@...nlining.org>
>>> +
>>> +description: |
>>> +  Qualcomm global clock control module provides the clocks, resets and power
>>> +  domains on MSM8937.
>>
>> This is exactly like msm8953, so why it cannot be there?
>>
> Not exactly clock names are different, msm8953 have sleep msm8937 have sleep_clk.

But this is the same clock, isn't it?

And while we are at this: fix the name, so "sleep" because there is no
point to write that an entry in clock-names is a clock. There is no
"_clk" anywhere else.


>>> +
>>> +  See also::
>>> +    include/dt-bindings/clock/qcom,gcc-msm8917.h
>>
>> typo, 8937
>>
> No

Ack

>>> +
>>> +properties:
>>> +  compatible:
>>> +    const: qcom,gcc-msm8937
>>> +
>>> +  clocks:
>>> +    items:
>>> +      - description: XO source
>>> +      - description: Sleep clock source
>>> +      - description: DSI phy instance 0 dsi clock
>>> +      - description: DSI phy instance 0 byte clock
>>> +      - description: DSI phy instance 1 dsi clock
>>> +      - description: DSI phy instance 1 byte clock
>>> +
>>> +  clock-names:
>>> +    items:
>>> +      - const: xo
>>> +      - const: sleep_clk
>>> +      - const: dsi0pll
>>> +      - const: dsi0pllbyte
>>> +      - const: dsi1pll
>>> +      - const: dsi1pllbyte
>>> +
>>> +required:
>>> +  - compatible
>>> +  - clocks
>>> +  - clock-names
>>> +  - '#power-domain-cells'
>>> +
>>> +allOf:
>>> +  - $ref: qcom,gcc.yaml#
>>> +
>>> +unevaluatedProperties: false
>>> +
>>> +examples:
>>> +  - |
>>> +    #include <dt-bindings/clock/qcom,rpmcc.h>
>>> +
>>> +    clock-controller@...0000 {
>>> +      compatible = "qcom,gcc-msm8937";
>>> +      reg = <0x01800000 0x80000>;
>>> +      #clock-cells = <1>;
>>> +      #reset-cells = <1>;
>>> +      #power-domain-cells = <1>;
>>> +      clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
>>> +               <&sleep_clk>,
>>> +               <&dsi0_phy 1>,
>>> +               <&dsi0_phy 0>,
>>> +               <&dsi1_phy 1>,
>>> +               <&dsi1_phy 0>;
>>> +      clock-names = "xo",
>>> +                    "sleep_clk",
>>> +                    "dsi0pll",
>>> +                    "dsi0pllbyte",
>>> +                    "dsi1pll",
>>> +                    "dsi1pllbyte";
>>> +    };
>>> +...
>>> diff --git a/include/dt-bindings/clock/qcom,gcc-msm8917.h b/include/dt-bindings/clock/qcom,gcc-msm8917.h
>>> index 4b421e7414b50bef2e2400f868ae5b7212a427bb..ec1f0b261dd5ccfe4896a00ffa9cf86de98b9cb3 100644
>>> --- a/include/dt-bindings/clock/qcom,gcc-msm8917.h
>>> +++ b/include/dt-bindings/clock/qcom,gcc-msm8917.h
>>> @@ -170,6 +170,22 @@
>>>  #define VFE1_CLK_SRC				163
>>>  #define VSYNC_CLK_SRC				164
>>>  #define GPLL0_SLEEP_CLK_SRC			165
>>> +#define BLSP1_QUP1_I2C_APPS_CLK_SRC		166
>>> +#define BLSP1_QUP1_SPI_APPS_CLK_SRC		167
>>> +#define BLSP2_QUP4_I2C_APPS_CLK_SRC		168
>>> +#define BLSP2_QUP4_SPI_APPS_CLK_SRC		169
>>
>> Why are you adding bindings to 8917? Nothing in commit msg explains
>> that.
> Because msm8917 driver was expanded with 8937 bits, i will expand the commit message.


But this is about hardware, not driver. If you want to combine in one
bindings devices from the same family (which I doubt these are, too many
differences), then make it clear with prefixes, see
61b17d072d811df5733a1570889b8c6fa6834bf8

If they are not that related, then a separate file.

>>
>> Best regards,
>> Krzysztof
>>


Best regards,
Krzysztof