linux-kernel - Re: [PATCH v4 09/19] dt-bindings: clock: Add StarFive JH7110 system clock and reset generator

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Message-ID: <Y/T+GNQAXLGyUtCH@spud>
Date:   Tue, 21 Feb 2023 17:23:36 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Hal Feng <hal.feng@...rfivetech.com>
Cc:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Ben Dooks <ben.dooks@...ive.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 09/19] dt-bindings: clock: Add StarFive JH7110 system
 clock and reset generator

Hey Hal,

On Tue, Feb 21, 2023 at 10:46:35AM +0800, Hal Feng wrote:
> From: Emil Renner Berthing <kernel@...il.dk>
> 
> Add bindings for the system clock and reset generator (SYSCRG) on the
> JH7110 RISC-V SoC by StarFive Ltd.
> 
> Reviewed-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Emil Renner Berthing <kernel@...il.dk>
> Signed-off-by: Hal Feng <hal.feng@...rfivetech.com>

> diff --git a/Documentation/devicetree/bindings/clock/starfive,jh7110-syscrg.yaml b/Documentation/devicetree/bindings/clock/starfive,jh7110-syscrg.yaml
> new file mode 100644
> index 000000000000..ec81504dcb27
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/starfive,jh7110-syscrg.yaml
> @@ -0,0 +1,80 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/starfive,jh7110-syscrg.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: StarFive JH7110 System Clock and Reset Generator
> +
> +maintainers:
> +  - Emil Renner Berthing <kernel@...il.dk>
> +
> +properties:
> +  compatible:
> +    const: starfive,jh7110-syscrg
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Main Oscillator (24 MHz)
> +      - description: GMAC1 RMII reference
> +      - description: GMAC1 RGMII RX
> +      - description: External I2S TX bit clock
> +      - description: External I2S TX left/right channel clock
> +      - description: External I2S RX bit clock
> +      - description: External I2S RX left/right channel clock
> +      - description: External TDM clock
> +      - description: External audio master clock

You didn't reply to the conversation I had with Krzysztof about how to
represent the optional nature of some of these clocks, contained in this
thread here:
https://lore.kernel.org/all/7a7bccb1-4d47-3d32-36e6-4aab7b5b8dad@starfivetech.com/

What happens to the gmac1 mux if only one of the input clocks is
provided?
And I mean what does the hardware do, not the software representation of
that mux in the driver.

> +
> +  clock-names:
> +    items:
> +      - const: osc
> +      - const: gmac1_rmii_refin
> +      - const: gmac1_rgmii_rxin
> +      - const: i2stx_bclk_ext
> +      - const: i2stx_lrck_ext
> +      - const: i2srx_bclk_ext
> +      - const: i2srx_lrck_ext
> +      - const: tdm_ext
> +      - const: mclk_ext

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