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Date:   Thu, 14 Dec 2023 13:44:24 +0100
From:   "Arnd Bergmann" <arnd@arndb.de>
To:     "Tomer Maimon" <tmaimon77@gmail.com>, pmenzel@molgen.mpg.de,
        "Rob Herring" <robh+dt@kernel.org>,
        krzysztof.kozlowski+dt@linaro.org,
        "Conor Dooley" <conor+dt@kernel.org>, avifishman70@gmail.com,
        tali.perry1@gmail.com, "Joel Stanley" <joel@jms.id.au>,
        venture@google.com, yuenn@google.com, benjaminfair@google.com,
        =?UTF-8?Q?Jonathan_Neusch=C3=A4fer?= <j.neuschaefer@gmx.net>
Cc:     openbmc@lists.ozlabs.org,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 3/3] soc: nuvoton: add NPCM BPC driver
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Precedence: bulk

On Wed, Dec 13, 2023, at 20:05, Tomer Maimon wrote:
> Add Nuvoton BMC NPCM BIOS post code (BPC) driver.
>
> The NPCM BPC monitoring two configurable I/O address written by the host
> on the bus.
>
> Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
> ---
>  drivers/soc/nuvoton/Kconfig    |   9 +
>  drivers/soc/nuvoton/Makefile   |   1 +
>  drivers/soc/nuvoton/npcm-bpc.c | 387 +++++++++++++++++++++++++++++++++
>  3 files changed, 397 insertions(+)
>  create mode 100644 drivers/soc/nuvoton/npcm-bpc.c

I try hard to avoid having user interfaces in drivers/soc/, that
subsystem should primarily be used for things that don't have an
existing subsystem in the kernel and are used by other in-kernel
drivers but don't export hteir own misc device.

> diff --git a/drivers/soc/nuvoton/Kconfig b/drivers/soc/nuvoton/Kconfig
> index d5102f5f0c28..ebd162633942 100644
> --- a/drivers/soc/nuvoton/Kconfig
> +++ b/drivers/soc/nuvoton/Kconfig
> @@ -2,6 +2,15 @@
> 
>  menu "NUVOTON SoC drivers"
> 
> +config NPCM_BPC
> +	tristate "NPCM BIOS Post Code support"
> +	depends on (ARCH_NPCM || COMPILE_TEST)
> +	help
> +	  Provides NPCM driver to control the BIOS Post Code
> +	  interface which allows the BMC to monitor and save
> +	  the data written by the host to an arbitrary I/O port,
> +	  the BPC is connected to the host thourgh LPC or eSPI bus.
> +

This one in particular looks like this might be implemented
by more than one BMC type, it's a fairly generic functionality.

Have you talked to the other maintainers of SoCs used in
OpenBMC about coming up with a common interface?

> +#define DEVICE_NAME	"npcm-bpc"

[nitpicking] No need for macros like this one, open-coding the
string is usually more readable.

    Arnd