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Date: Wed, 19 Jan 2022 18:44:14 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Lucas tanure <tanureal@...nsource.cirrus.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
Stefan Binding <sbinding@...nsource.cirrus.com>,
Mark Brown <broonie@...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
Subject: Re: [PATCH v3 05/10] platform/x86: i2c-multi-instantiate: Move it to
drivers/acpi folder
On Wed, Jan 19, 2022 at 6:33 PM Lucas tanure
<tanureal@...nsource.cirrus.com> wrote:
>
> On 1/19/22 16:53, Rafael J. Wysocki wrote:
> > 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?
> >
>
> It was a request made by Andy Shevchenko:
> https://lkml.org/lkml/2021/12/3/347
But he hasn't given any reasons why that'd be better.
> There is no plan to use our CS35L41 HDA with non-x86 platforms and we
> can't comment about i2c-multi-instantiate use.
> For us it can stay in x86 folder until an actual request.
I'd prefer that if Hans agrees.
> >> ---
> >> 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
> >>
>
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