linux-kernel - Re: [PATCH v2 1/5] dt-bindings: clock: Document clock and reset unit of RK3528

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Message-ID: <9caddd6a-fe1b-468a-ba1e-0513e46404dc@kernel.org>
Date: Fri, 10 Jan 2025 08:42:40 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Yao Zi <ziyao@...root.org>
Cc: 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>, Heiko Stuebner <heiko@...ech.de>,
 Philipp Zabel <p.zabel@...gutronix.de>, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] dt-bindings: clock: Document clock and reset unit
 of RK3528

On 09/01/2025 10:16, Yao Zi wrote:
> On Thu, Jan 09, 2025 at 09:59:25AM +0100, Krzysztof Kozlowski wrote:
>> On Wed, Jan 08, 2025 at 11:46:02AM +0000, Yao Zi wrote:
>>> There are two types of clocks in RK3528 SoC, CRU-managed and
>>> SCMI-managed. Independent IDs are assigned to them.
>>>
>>> For the reset part, differing from previous Rockchip SoCs and
>>> downstream bindings which embeds register offsets into the IDs, gapless
>>> numbers starting from zero are used.
>>>
>>> Signed-off-by: Yao Zi <ziyao@...root.org>
>>> ---
>>>  .../bindings/clock/rockchip,rk3528-cru.yaml   |  67 +++
>>>  .../dt-bindings/clock/rockchip,rk3528-cru.h   | 453 ++++++++++++++++++
>>>  .../dt-bindings/reset/rockchip,rk3528-cru.h   | 241 ++++++++++
>>>  3 files changed, 761 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/clock/rockchip,rk3528-cru.yaml
>>>  create mode 100644 include/dt-bindings/clock/rockchip,rk3528-cru.h
>>>  create mode 100644 include/dt-bindings/reset/rockchip,rk3528-cru.h
>>>
>>> diff --git a/Documentation/devicetree/bindings/clock/rockchip,rk3528-cru.yaml b/Documentation/devicetree/bindings/clock/rockchip,rk3528-cru.yaml
>>> new file mode 100644
>>> index 000000000000..19dbda858172
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/clock/rockchip,rk3528-cru.yaml
>>> @@ -0,0 +1,67 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/clock/rockchip,rk3528-cru.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Rockchip RK3528 Clock and Reset Controller
>>> +
>>> +maintainers:
>>> +  - Yao Zi <ziyao@...root.org>
>>> +
>>> +description: |
>>> +  The RK3528 clock controller generates the clock and also implements a reset
>>> +  controller for SoC peripherals. For example, it provides SCLK_UART0 and
>>> +  PCLK_UART0 as well as SRST_P_UART0 and SRST_S_UART0 for the first UART
>>> +  module.
>>> +  Each clock is assigned an identifier, consumer nodes can use it to specify
>>> +  the clock. All available clock and reset IDs are defined in dt-binding
>>> +  headers.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    const: rockchip,rk3528-cru
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  assigned-clocks: true
>>> +
>>> +  assigned-clock-rates: true
>>
>> Drop both, totally redundant.
> 
> Okay, will fix in next version.
> 
>>> +
>>> +  clocks:
>>> +    items:
>>> +      - description: External 24MHz oscillator clock
>>> +      - description: 50MHz clock generated by PHY module
>>> +
>>> +  clock-names:
>>> +    items:
>>> +      - const: xin24m
>>> +      - const: gmac0
>>
>> gmac
>> (unless you have gmac1 here as well but then please add it now)
> 
> RK3528 comes with two onchip gmacs. This input clock is only used for
> the first one and I think keeping the number would give the reader an
> extra hint. What do you think about it?
You don't get the point. What clock is from this module perspective? gmac.

Best regards,
Krzysztof