linux-kernel - Re: [PATCH v2 1/4] dt-bindings: clock: ipq5424-apss-clk: Add ipq5424 apss clock controller

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Message-ID: <20250724-remarkable-kind-ibex-3bb86c@kuoka>
Date: Thu, 24 Jul 2025 10:14:01 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Varadarajan Narayanan <quic_varada@...cinc.com>
Cc: andersson@...nel.org, mturquette@...libre.com, sboyd@...nel.org, 
	robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, konradybcio@...nel.org, 
	rafael@...nel.org, viresh.kumar@...aro.org, ilia.lin@...nel.org, djakov@...nel.org, 
	quic_srichara@...cinc.com, quic_mdalam@...cinc.com, linux-arm-msm@...r.kernel.org, 
	linux-clk@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dt-bindings: clock: ipq5424-apss-clk: Add ipq5424
 apss clock controller

On Wed, Jul 23, 2025 at 04:38:12PM +0530, Varadarajan Narayanan wrote:
> From: Sricharan Ramabadhran <quic_srichara@...cinc.com>
> 
> The CPU core in ipq5424 is clocked by a huayra PLL with RCG support.
> The RCG and PLL have a separate register space from the GCC.
> Also the L3 cache has a separate pll and needs to be scaled along
> with the CPU.
> 
> Co-developed-by: Md Sadre Alam <quic_mdalam@...cinc.com>
> Signed-off-by: Md Sadre Alam <quic_mdalam@...cinc.com>
> Signed-off-by: Sricharan Ramabadhran <quic_srichara@...cinc.com>
> [ Added interconnect related changes ]
> Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> ---
> v2: Add #interconnect-cells to help enable L3 pll as ICC clock
>     Add master/slave ids

and v1 was where? I cannot find it in the inbox, no lore links.


> ---
>  .../bindings/clock/qcom,ipq5424-apss-clk.yaml | 61 +++++++++++++++++++
>  include/dt-bindings/clock/qcom,apss-ipq.h     |  6 ++
>  .../dt-bindings/interconnect/qcom,ipq5424.h   |  3 +
>  3 files changed, 70 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/qcom,ipq5424-apss-clk.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/qcom,ipq5424-apss-clk.yaml b/Documentation/devicetree/bindings/clock/qcom,ipq5424-apss-clk.yaml
> new file mode 100644
> index 000000000000..abb9eb78d271
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/qcom,ipq5424-apss-clk.yaml
> @@ -0,0 +1,61 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/qcom,ipq5424-apss-clk.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm APSS IPQ5424 Clock Controller
> +
> +maintainers:
> +  - Sricharan Ramabadhran <quic_srichara@...cinc.com>
> +  - Md Sadre Alam <quic_mdalam@...cinc.com>

Are you sure? Why they do not send their code then? Usually sending
other poeple's code means they do not care or moved on or changed jobs.

> +
> +description: |

Do not need '|' unless you need to preserve formatting.

> +  The CPU core in ipq5424 is clocked by a huayra PLL with RCG support.
> +  The RCG and PLL have a separate register space from the GCC.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,ipq5424-apss-clk

Missing blank line

> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Reference to the XO clock.
> +      - description: Reference to the GPLL0 clock.
> +
> +  clock-names:
> +    items:
> +      - const: xo
> +      - const: gpll0

You do not name the inputs according how provider calls them. You name
them based on the INPUT. pll? source? bus?

> +
> +  '#clock-cells':
> +    const: 1
> +
> +  '#interconnect-cells':
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - '#clock-cells'
> +  - '#interconnect-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,ipq5424-gcc.h>
> +
> +    apss_clk: apss-clock@...0000 {

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

Best regards,
Krzysztof