linux-kernel - Re: [PATCH v3 05/10] platform/x86: i2c-multi-instantiate: Move it to drivers/acpi folder

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Message-ID: <CAJZ5v0g0n201FPcG9LBNG3e4UdNYSWmj_1sN3MxLxmK=GoF+tA@mail.gmail.com>
Date:   Wed, 19 Jan 2022 17:53:05 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Stefan Binding <sbinding@...nsource.cirrus.com>
Cc:     Mark Brown <broonie@...nel.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@...a-project.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        patches@...nsource.cirrus.com,
        Lucas Tanure <tanureal@...nsource.cirrus.com>
Subject: Re: [PATCH v3 05/10] platform/x86: i2c-multi-instantiate: Move it to
 drivers/acpi folder

On Tue, Jan 18, 2022 at 3:53 PM Stefan Binding
<sbinding@...nsource.cirrus.com> wrote:
>
> From: Lucas Tanure <tanureal@...nsource.cirrus.com>
>
> Moving I2C multi instantiate driver to drivers/acpi folder for
> upcoming conversion into a generic bus multi instantiate
> driver for SPI and I2C
>
> Signed-off-by: Lucas Tanure <tanureal@...nsource.cirrus.com>
> Signed-off-by: Stefan Binding <sbinding@...nsource.cirrus.com>

Why are you moving it away from platform/x86?

Adding SPI to the mix doesn't seem to be a sufficient reason.

If this were going to be needed on non-x86, that would be a good
reason for moving it, but is that actually the case?  If so, why isn't
that mentioned in the changelog above?

> ---
>  MAINTAINERS                                           |  2 +-
>  drivers/acpi/Kconfig                                  | 11 +++++++++++
>  drivers/acpi/Makefile                                 |  1 +
>  .../{platform/x86 => acpi}/i2c-multi-instantiate.c    |  0
>  drivers/acpi/scan.c                                   |  2 +-
>  drivers/platform/x86/Kconfig                          | 11 -----------
>  drivers/platform/x86/Makefile                         |  1 -
>  7 files changed, 14 insertions(+), 14 deletions(-)
>  rename drivers/{platform/x86 => acpi}/i2c-multi-instantiate.c (100%)
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4e828542b089..546f9e149d28 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -392,7 +392,7 @@ ACPI I2C MULTI INSTANTIATE DRIVER
>  M:     Hans de Goede <hdegoede@...hat.com>
>  L:     platform-driver-x86@...r.kernel.org
>  S:     Maintained
> -F:     drivers/platform/x86/i2c-multi-instantiate.c
> +F:     drivers/acpi/i2c-multi-instantiate.c
>
>  ACPI PCC(Platform Communication Channel) MAILBOX DRIVER
>  M:     Sudeep Holla <sudeep.holla@....com>
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index ba45541b1f1f..2fd78366af6f 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -295,6 +295,17 @@ config ACPI_PROCESSOR
>           To compile this driver as a module, choose M here:
>           the module will be called processor.
>
> +config ACPI_I2C_MULTI_INST
> +       tristate "I2C multi instantiate pseudo device driver"
> +       depends on I2C
> +       help
> +         Some ACPI-based systems list multiple i2c-devices in a single ACPI
> +         firmware-node. This driver will instantiate separate i2c-clients
> +         for each device in the firmware-node.
> +
> +         To compile this driver as a module, choose M here: the module
> +         will be called i2c-multi-instantiate.
> +
>  config ACPI_IPMI
>         tristate "IPMI"
>         depends on IPMI_HANDLER
> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> index bb757148e7ba..d4db7fb0baf0 100644
> --- a/drivers/acpi/Makefile
> +++ b/drivers/acpi/Makefile
> @@ -104,6 +104,7 @@ obj-$(CONFIG_ACPI_SPCR_TABLE)       += spcr.o
>  obj-$(CONFIG_ACPI_DEBUGGER_USER) += acpi_dbg.o
>  obj-$(CONFIG_ACPI_PPTT)        += pptt.o
>  obj-$(CONFIG_ACPI_PFRUT)       += pfr_update.o pfr_telemetry.o
> +obj-$(CONFIG_ACPI_I2C_MULTI_INST)      += i2c-multi-instantiate.o
>
>  # processor has its own "processor." module_param namespace
>  processor-y                    := processor_driver.o
> diff --git a/drivers/platform/x86/i2c-multi-instantiate.c b/drivers/acpi/i2c-multi-instantiate.c
> similarity index 100%
> rename from drivers/platform/x86/i2c-multi-instantiate.c
> rename to drivers/acpi/i2c-multi-instantiate.c
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 1331756d4cfc..3e85a02f6ba2 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -1738,7 +1738,7 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
>          * must be instantiated for each, each with its own i2c_device_id.
>          * Normally we only instantiate an i2c-client for the first resource,
>          * using the ACPI HID as id. These special cases are handled by the
> -        * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
> +        * drivers/acpi/i2c-multi-instantiate.c driver, which knows
>          * which i2c_device_id to use for each resource.
>          */
>                 {"BSG1160", },
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index 24deeeb29af2..37c1c150508d 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -990,17 +990,6 @@ config TOPSTAR_LAPTOP
>
>           If you have a Topstar laptop, say Y or M here.
>
> -config I2C_MULTI_INSTANTIATE
> -       tristate "I2C multi instantiate pseudo device driver"
> -       depends on I2C && ACPI
> -       help
> -         Some ACPI-based systems list multiple i2c-devices in a single ACPI
> -         firmware-node. This driver will instantiate separate i2c-clients
> -         for each device in the firmware-node.
> -
> -         To compile this driver as a module, choose M here: the module
> -         will be called i2c-multi-instantiate.
> -
>  config MLX_PLATFORM
>         tristate "Mellanox Technologies platform support"
>         depends on I2C && REGMAP
> diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
> index c12a9b044fd8..6c7870190564 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -110,7 +110,6 @@ obj-$(CONFIG_TOPSTAR_LAPTOP)        += topstar-laptop.o
>
>  # Platform drivers
>  obj-$(CONFIG_FW_ATTR_CLASS)            += firmware_attributes_class.o
> -obj-$(CONFIG_I2C_MULTI_INSTANTIATE)    += i2c-multi-instantiate.o
>  obj-$(CONFIG_MLX_PLATFORM)             += mlx-platform.o
>  obj-$(CONFIG_TOUCHSCREEN_DMI)          += touchscreen_dmi.o
>  obj-$(CONFIG_WIRELESS_HOTKEY)          += wireless-hotkey.o
> --
> 2.25.1
>