linux-kernel - RE: [PATCH 1/7] dt-bindings: soc: add bindings for i.MX93 SRC

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Date:   Tue, 24 May 2022 10:37:09 +0000
From:   Peng Fan <peng.fan@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     Aisheng Dong <aisheng.dong@....com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 1/7] dt-bindings: soc: add bindings for i.MX93 SRC

> Subject: Re: [PATCH 1/7] dt-bindings: soc: add bindings for i.MX93 SRC
> 
> On 23/05/2022 13:30, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@....com>
> >
> > Add bindings for i.MX93 System Reset Controller(SRC). SRC supports
> > resets and power gating for mixes.
> >
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >  .../bindings/soc/imx/fsl,imx93-src.yaml       | 88
> +++++++++++++++++++
> >  include/dt-bindings/power/imx93-power.h       | 11 +++
> >  2 files changed, 99 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/soc/imx/fsl,imx93-src.yaml
> 
> File should be in respective subsystem, so probably power/reset?

ok, will put under power.

> 
> >  create mode 100644 include/dt-bindings/power/imx93-power.h
> >
> > diff --git
> > a/Documentation/devicetree/bindings/soc/imx/fsl,imx93-src.yaml
> > b/Documentation/devicetree/bindings/soc/imx/fsl,imx93-src.yaml
> > new file mode 100644
> > index 000000000000..d45c1458b9c1
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/soc/imx/fsl,imx93-src.yaml
> > @@ -0,0 +1,88 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML 1.2
> > +---
> > +$id:
> > +> > +title: NXP i.MX9 System Reset Controller
> > +
> > +maintainers:
> > +  - Peng Fan <peng.fan@....com>
> > +
> > +description: |
> > +  The System Reset Controller (SRC) is responsible for the generation
> > +of
> > +  all the system reset signals and boot argument latching.
> > +
> > +  Its main functions are as follows,
> > +  - Deals with all global system reset sources from other modules,
> > +    and generates global system reset.
> > +  - Responsible for power gating of MIXs (Slices) and their memory
> > +    low power control.
> > +
> > +properties:
> > +  compatible:
> > +    items:
> > +      - const: fsl,imx93-src
> > +      - const: syscon
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  slice:
> 
> Why do you need this subnode, instead of listing domains here?

I follow
Documentation/devicetree/bindings/power/fsl,imx-gpcv2.yaml

There are several slices in SRC, just like there are many pgcs in gpcv2.


> 
> > +    type: object
> > +    description: list of power domains provided by this controller.
> > +
> 
> Hm, what about address/size cells? Is syscon schema bringing these?

The slice submode should have address/size cells, but I not
meet yaml/dtbs check error. Will add it.

Not sure syscon bringing or not.

> 
> > +    patternProperties:
> > +      "power-domain@[0-9]$":
> > +        type: object
> 
> Missing ref to power-domain.yaml

Ok.

> 
> > +        properties:
> > +
> > +          '#power-domain-cells':
> > +            const: 0
> > +
> > +          reg:
> > +            description: |
> > +              Power domain index. Valid values are defined in
> > +              include/dt-bindings/power/imx93-power.h for fsl,imx93-src
> > +            maxItems: 1
> > +
> > +          clocks:
> > +            description: |
> > +              A number of phandles to clocks that need to be enabled
> > +              during domain power-up sequencing to ensure reset
> > +              propagation into devices located inside this power domain.
> > +            minItems: 1
> > +            maxItems: 5
> > +
> > +        required:
> > +          - '#power-domain-cells'
> > +          - reg
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - slice
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/clock/imx93-clock.h>
> > +    #include <dt-bindings/power/imx93-power.h>
> > +
> > +    src@...60000 {
> 
> reset-controller
> or some other generic node name.

It is not a single reset or power domain controller,
Currently linux driver just use it as a power domain
controller.

Thanks,
Peng.

> 
> > +        compatible = "fsl,imx93-src", "syscon";
> > +        reg = <0x44460000 0x10000>;
> > +
> > +        slice {
> > +                #address-cells = <1>;
> > +                #size-cells = <0>;
> > +
> > +                mediamix: power-domain@0 {
> 
> Best regards,
> Krzysztof