linux-kernel - Re: [PATCH v3 2/3] soc: dt-bindings: add loongson-2 pm

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Date:   Fri, 16 Jun 2023 09:03:12 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     zhuyinbo <zhuyinbo@...ngson.cn>
CC:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Pavel Machek <pavel@....cz>, Marc Zyngier <maz@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <loongarch@...ts.linux.dev>, Jianmin Lv <lvjianmin@...ngson.cn>,
        <wanghongliang@...ngson.cn>, Liu Peibao <liupeibao@...ngson.cn>,
        <loongson-kernel@...ts.loongnix.cn>
Subject: Re: [PATCH v3 2/3] soc: dt-bindings: add loongson-2 pm

On Fri, Jun 16, 2023 at 03:53:38PM +0800, zhuyinbo wrote:
> 在 2023/6/16 下午2:58, Conor Dooley 写道:
> > 
> > Rob, could you take a look at this please? On v2 while you were away I
> > was kinda struggling w/ suspend-address & whether it made sense.
> > 
> > The v2 & v1 are here:
> > https://lore.kernel.org/all/20230522093156.7108-3-zhuyinbo@loongson.cn/
> > https://lore.kernel.org/all/20230517073149.31980-3-zhuyinbo@loongson.cn/
> > 
> > On Thu, Jun 15, 2023 at 05:17:56PM +0800, Yinbo Zhu wrote:
> > > Add the Loongson-2 SoC Power Management Controller binding with DT
> > > schema format using json-schema.
> > > 
> > > Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
> > > ---
> > >   .../soc/loongson/loongson,ls2k-pmc.yaml       | 53 +++++++++++++++++++
> > >   MAINTAINERS                                   |  6 +++
> > >   2 files changed, 59 insertions(+)
> > >   create mode 100644 Documentation/devicetree/bindings/soc/loongson/loongson,ls2k-pmc.yaml
> > > 
> > > diff --git a/Documentation/devicetree/bindings/soc/loongson/loongson,ls2k-pmc.yaml b/Documentation/devicetree/bindings/soc/loongson/loongson,ls2k-pmc.yaml
> > > new file mode 100644
> > > index 000000000000..32499bd10f8c
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/soc/loongson/loongson,ls2k-pmc.yaml
> > 
> > The filename should ideally match one of the compatibles.
> 
> 
> I learn about that yaml file name need match this compatible, but here
> using a specific compatible as the name of the yaml file seems a bit
> inappropriate . After all, this yaml file needs to cover lots of ls2k
> series SoC rather than a specific SoC, and the yaml file naming in
> kernel drivers is basically the same that use cover a series SoC's way.
> 
> > 
> > > @@ -0,0 +1,53 @@
> > > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/soc/loongson/loongson,ls2k-pmc.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Loongson-2 Power Manager controller
> > > +
> > > +maintainers:
> > > +  - Yinbo Zhu <zhuyinbo@...ngson.cn>
> > > +
> > > +properties:
> > > +  compatible:
> > > +    oneOf:
> > > +      - items:
> > > +          - enum:
> > > +              - loongson,ls2k1000-pmc
> > > +              - loongson,ls2k0500-pmc
> > 
> > I notice the driver only supports one of these two. Is there a reason
> > for that?
> 
> 
> The driver can support both of the above, and I will add another.

The driver only contains
	static const struct of_device_id loongson2_pm_match[] = {
	       { .compatible = "loongson,ls2k1000-pmc", },
	       {},
	};
so it only supports the 2k1000 right now. Are the 2k1000 and 2k0500
compatible with eachother?

> > > +          - const: syscon
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  interrupts:
> > > +    maxItems: 1
> > > +
> > > +  suspend-address:
> > > +    $ref: /schemas/types.yaml#/definitions/uint32
> > > +    description:
> > > +      The "suspend-address" is a deep sleep state (Suspend To RAM)
> > > +      firmware entry address which was jumped from kernel and it's
> > > +      value was dependent on specific platform firmware code. In
> > > +      addition, the PM need according to it to indicate that current
> > > +      SoC whether support Suspend To RAM.
> > > +
> > > +required:
> > > +  - compatible
> > > +  - reg
> > > +  - interrupts
> > > +
> > > +additionalProperties: false
> > > +
> > > +examples:
> > > +  - |
> > > +    #include <dt-bindings/interrupt-controller/irq.h>
> > > +
> > > +    pmc: pm@...27000 {
> >         ^^^
> > 
> > nit: this label isn't used, so you can drop it.
> 
> 
> This lable need to be used by poweroff and reboot node but I don't add
> these node that reference pmc here.

Right, in the dts it might need those, but not in the example in the
binding.

Cheers,
Conor.


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