linux-kernel - Re: [PATCH 01/38] dt-bindings: clock: add rk3562 cru bindings

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Message-ID: <e75b38b4-605f-4f9e-8c95-204877b9bf84@rock-chips.com>
Date: Tue, 24 Dec 2024 16:36:11 +0800
From: Kever Yang <kever.yang@...k-chips.com>
To: Conor Dooley <conor@...nel.org>
Cc: heiko@...ech.de, linux-rockchip@...ts.infradead.org,
 devicetree@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Rob Herring <robh@...nel.org>,
 Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Elaine Zhang <zhangqing@...k-chips.com>, linux-clk@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 01/38] dt-bindings: clock: add rk3562 cru bindings

Hi Conor,

On 2024/12/22 22:51, Conor Dooley wrote:
> On Fri, Dec 20, 2024 at 06:37:47PM +0800, Kever Yang wrote:
>> Document the device tree bindings of the rockchip rk3562 SoC
>> clock and reset unit.
>>
>> Signed-off-by: Kever Yang <kever.yang@...k-chips.com>
>> ---
>>
>>   .../bindings/clock/rockchip,rk3562-cru.yaml   | 62 +++++++++++++++++++
>>   1 file changed, 62 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/clock/rockchip,rk3562-cru.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/clock/rockchip,rk3562-cru.yaml b/Documentation/devicetree/bindings/clock/rockchip,rk3562-cru.yaml
>> new file mode 100644
>> index 000000000000..aa8dedf2bfce
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/clock/rockchip,rk3562-cru.yaml
>> @@ -0,0 +1,62 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/clock/rockchip,rk3562-cru.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Rockchip rk3562 Clock and Reset Control Module
>> +
>> +maintainers:
>> +  - Elaine Zhang <zhangqing@...k-chips.com>
>> +  - Heiko Stuebner <heiko@...ech.de>
>> +
>> +description:
>> +  The RK3562 clock controller generates the clock and also implements a reset
>> +  controller for SoC peripherals. For example it provides SCLK_UART2 and
>> +  PCLK_UART2, as well as SRST_P_UART2 and SRST_S_UART2 for the second UART
>> +  module.
>> +
>> +properties:
>> +  compatible:
>> +    const: rockchip,rk3562-cru
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  "#clock-cells":
>> +    const: 1
>> +
>> +  "#reset-cells":
>> +    const: 1
>> +
>> +  clocks:
>> +    maxItems: 2
>> +
>> +  clock-names:
>> +    items:
>> +      - const: xin24m
>> +      - const: xin32k
>> +
>> +  rockchip,grf:
>> +    $ref: /schemas/types.yaml#/definitions/phandle
>> +    description:
>> +      Phandle to the syscon managing the "general register files" (GRF),
>> +      if missing pll rates are not changeable, due to the missing pll
>> +      lock status.
> Two questions:
> - Why would it ever be missing? Seems like you should make it required.

This may not need for some of SoC, for the rk3562, we don't need it, I 
will remove it.


Thanks,
- Kever
> - Why is it not possible to look the grf up by compatible rather than
>    phandle?
>
> Cheers,
> Conor.
>
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - "#clock-cells"
>> +  - "#reset-cells"
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    clock-controller@...00000 {
>> +      compatible = "rockchip,rk3562-cru";
>> +      reg = <0xff100000 0x40000>;
>> +      #clock-cells = <1>;
>> +      #reset-cells = <1>;
>> +    };
>> -- 
>> 2.25.1
>>
>>