linux-kernel - Re: [External] Re: [PATCH v3 4/4] dt-bindings: firmware: Document ffitbl binding

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Message-ID: <CAEEQ3wmG1OiE3GFqQp9SP+oKUbTfuTPx=rNGd-sjKsW7vv3bew@mail.gmail.com>
Date:   Thu, 6 Jul 2023 11:43:55 +0800
From:   运辉崔 <cuiyunhui@...edance.com>
To:     Conor Dooley <conor@...nel.org>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        devicetree@...r.kernel.org
Cc:     sunilvl@...tanamicro.com, ardb@...nel.org, palmer@...belt.com,
        paul.walmsley@...ive.com, aou@...s.berkeley.edu,
        linux-riscv@...ts.infradead.org, rminnich@...il.com,
        mark.rutland@....com, lpieralisi@...nel.org, rafael@...nel.org,
        lenb@...nel.org, jdelvare@...e.com, yc.hung@...iatek.com,
        angelogioacchino.delregno@...labora.com,
        allen-kh.cheng@...iatek.com, pierre-louis.bossart@...ux.intel.com,
        tinghan.shen@...iatek.com, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, geshijian@...edance.com,
        weidong.wd@...edance.com
Subject: Re: [External] Re: [PATCH v3 4/4] dt-bindings: firmware: Document
 ffitbl binding

Hi Conor,

Added dts Maintainers,

On Wed, Jul 5, 2023 at 11:07 PM Conor Dooley <conor@...nel.org> wrote:
>
> Hey,
>
> On Wed, Jul 05, 2023 at 07:42:51PM +0800, Yunhui Cui wrote:
> > Add the description for ffitbl subnode.
> >
> > Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>
> > ---
> >  .../devicetree/bindings/firmware/ffitbl.txt   | 27 +++++++++++++++++++
> >  MAINTAINERS                                   |  1 +
> >  2 files changed, 28 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/firmware/ffitbl.txt
> >
> > diff --git a/Documentation/devicetree/bindings/firmware/ffitbl.txt b/Documentation/devicetree/bindings/firmware/ffitbl.txt
> > new file mode 100644
> > index 000000000000..c42368626199
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/firmware/ffitbl.txt
>
> Firstly, new dt-bindings need to be done in yaml, not in text form.
> Secondly, you didn't re-run get_maintainer.pl after adding this binding,
> so you have not CCed any of the other dt-binding maintainers nor the
> devicetree mailing list.

Re-run get_maintainer.pl and added maintainers into the maillist.
emm.. There is some *txt in
Documentation/devicetree/bindings/firmware/, isn't it?

>
> > @@ -0,0 +1,27 @@
>
> > +FFI(FDT FIRMWARE INTERFACE) driver
> > +
> > +Required properties:
> > + - entry             : acpi or smbios root pointer, u64
> > + - reg                       : acpi or smbios version, u32
>
> Please go look at any other dt-binding (or the example schema) as to how
> these properties should be used. A "reg" certainly should not be being
> used to store the revision...

Okay, If so，I'll add a property "version" into the dts instead of
"reg", just like, WDYT?
ffitbl {
    smbios {
        entry = "";
        version = < 0x02 >;
    }
   acpi {
         entry = "";
         version = < 0x06 >;
  }
}

>
> Cheers,
> Conor.
>
> > +
> > +Some bootloaders, such as Coreboot do not support EFI,
> > +only devicetree and some arches do not have a reserved
> > +address segment. Add "ffitbl" subnode to obtain ACPI RSDP
> > +and SMBIOS entry.
> > +This feature is known as FDT Firmware Interface (FFI).
> > +
> > +Example:
> > +     ffitbl {
> > +
> > +             smbios {
> > +                             entry = "";
> > +                             reg = < 0x03 >;
> > +
> > +             }
> > +             acpi {
> > +                             entry = "";
> > +                             reg = < 0x06 >;
> > +
> > +             }
> > +     }
> > +
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 9b886ef36587..008257e55062 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -7874,6 +7874,7 @@ F:      include/linux/efi*.h
> >  FDT FIRMWARE INTERFACE (FFI)
> >  M:   Yunhui Cui cuiyunhui@...edance.com
> >  S:   Maintained
> > +F:   Documentation/devicetree/bindings/firmware/ffitbl.txt
> >  F:   drivers/firmware/ffi.c
> >  F:   include/linux/ffi.h
> >
> > --
> > 2.20.1
> >

Thanks,
Yunhui