linux-kernel - Re: [PATCH v3 01/12] dt-bindings: clock: renesas,r9a08g045-vbattb: Document VBATTB

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Message-ID: <20240830174633.GA559043-robh@kernel.org>
Date: Fri, 30 Aug 2024 12:46:33 -0500
From: Rob Herring <robh@...nel.org>
To: Claudiu <claudiu.beznea@...on.dev>
Cc: geert+renesas@...der.be, mturquette@...libre.com, sboyd@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org,
	alexandre.belloni@...tlin.com, magnus.damm@...il.com,
	p.zabel@...gutronix.de, linux-renesas-soc@...r.kernel.org,
	linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rtc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH v3 01/12] dt-bindings: clock: renesas,r9a08g045-vbattb:
 Document VBATTB

On Fri, Aug 30, 2024 at 04:02:07PM +0300, Claudiu wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> The VBATTB IP of the Renesas RZ/G3S SoC controls the clock for RTC,
> the tamper detector and a small general usage memory of 128B. Add
> documentation for it.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
> 
> Changes in v3:
> - moved the file to clock dt bindings directory as it is the
>   only functionality supported at the moment; the other functionalities
>   (tamper detector, SRAM) are offered though register spreaded
>   though the address space of the VBATTB IP and not actually
>   individual devices; the other functionalities are not
>   planned to be supported soon and if they will be I think they
>   fit better on auxiliary bus than MFD
> - dropped interrupt names as requested in the review process
> - dropped the inner node for clock controller
> - added #clock-cells
> - added rtx clock
> - updated description for renesas,vbattb-load-nanofarads
> - included dt-bindings/interrupt-controller/irq.h in examples section
> 
> Changes in v2:
> - changed file name and compatible
> - updated title, description sections
> - added clock controller part documentation and drop dedicated file
>   for it included in v1
> - used items to describe interrupts, interrupt-names, clocks, clock-names,
>   resets
> - dropped node labels and status
> - updated clock-names for clock controller to cope with the new
>   logic on detecting the necessity to setup bypass
> 
>  .../clock/renesas,r9a08g045-vbattb.yaml       | 81 +++++++++++++++++++
>  1 file changed, 81 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/renesas,r9a08g045-vbattb.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/renesas,r9a08g045-vbattb.yaml b/Documentation/devicetree/bindings/clock/renesas,r9a08g045-vbattb.yaml
> new file mode 100644
> index 000000000000..29df0e01fae5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/renesas,r9a08g045-vbattb.yaml
> @@ -0,0 +1,81 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/renesas,r9a08g045-vbattb.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas Battery Backup Function (VBATTB)
> +
> +description:
> +  Renesas VBATTB is an always on powered module (backed by battery) which
> +  controls the RTC clock (VBATTCLK), tamper detection logic and a small
> +  general usage memory (128B).
> +
> +maintainers:
> +  - Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> +
> +properties:
> +  compatible:
> +    const: renesas,r9a08g045-vbattb
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    items:
> +      - description: tamper detector interrupt
> +
> +  clocks:
> +    items:
> +      - description: VBATTB module clock
> +      - description: RTC input clock (crystal oscillator or external clock device)
> +
> +  clock-names:
> +    items:
> +      - const: bclk
> +      - const: rtx
> +
> +  '#clock-cells':
> +    const: 1
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  resets:
> +    items:
> +      - description: VBATTB module reset
> +
> +  renesas,vbattb-load-nanofarads:

Use defined units, don't add your own. So -picofarads should work for 
you.

> +    description: load capacitance of the on board crystal oscillator
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [ 4000, 7000, 9000, 12500 ]
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - '#clock-cells'
> +  - power-domains
> +  - resets
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/r9a08g045-cpg.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    vbattb@...5c000 {

clock-controller@...

> +        compatible = "renesas,r9a08g045-vbattb";
> +        reg = <0x1005c000 0x1000>;
> +        interrupts = <GIC_SPI 43 IRQ_TYPE_LEVEL_HIGH>;
> +        clocks = <&cpg CPG_MOD R9A08G045_VBAT_BCLK>, <&vbattb_xtal>;
> +        clock-names = "bclk", "rtx";
> +        #clock-cells = <1>;
> +        power-domains = <&cpg>;
> +        resets = <&cpg R9A08G045_VBAT_BRESETN>;
> +        renesas,vbattb-load-nanofarads = <12500>;
> +    };
> -- 
> 2.39.2
>