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

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Message-ID: <20230705-oblivious-unstuffed-8e028a5b243c@spud>
Date:   Wed, 5 Jul 2023 16:06:45 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Yunhui Cui <cuiyunhui@...edance.com>
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: [PATCH v3 4/4] dt-bindings: firmware: Document ffitbl binding

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.

> @@ -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...

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
> 

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