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Message-ID: <f2d8e74f-f33b-2489-1b90-b11bf7465d19@redhat.com>
Date: Tue, 25 May 2021 15:10:34 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Daniel Scally <djrscally@...il.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Wolfram Sang <wsa@...nel.org>,
Lee Jones <lee.jones@...aro.org>,
Maximilian Luz <luzmaximilian@...il.com>,
linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
linux-i2c@...r.kernel.org, platform-driver-x86@...r.kernel.org,
devel@...ica.org
Cc: Len Brown <lenb@...nel.org>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Russell King <linux@...linux.org.uk>,
Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <bgolaszewski@...libre.com>,
Mark Gross <mgross@...ux.intel.com>,
Robert Moore <robert.moore@...el.com>,
Erik Kaneda <erik.kaneda@...el.com>,
laurent.pinchart@...asonboard.com, kieran.bingham@...asonboard.com
Subject: Re: [PATCH v4 0/8] Introduce intel_skl_int3472 module
Hi Daniel,
On 5/20/21 4:09 PM, Daniel Scally wrote:
> Hello all
>
> Apologies for the long delay since the last version of this series; the time I
> had free to work on it became somewhat restrained.
No worries, thank you for all the work you are putting into this.
I have not taken a close look at the code yet, but I see that Andy has and
the amount of remarks which he has on patch 7/8 which is the big one seems
to be limited, so I believe that we are getting close to this being ready
for merging.
This touches a lot of subsystems, so we need to come up with a plan to
merge this. Here is my proposal for how to do this:
1/8 ACPI: scan: Extend acpi_walk_dep_device_list()
2/8 ACPI: scan: Add function to fetch dependent of acpi device
3/8 i2c: core: Add a format macro for I2C device names
4/8 gpiolib: acpi: Export acpi_get_gpiod()
5/8 clkdev: Make clkdev_drop() null aware
6/8 gpiolib: acpi: Add acpi_gpio_get_io_resource()
7/8 platform/x86: Add intel_skl_int3472 driver
8/8 mfd: tps68470: Remove tps68470 MFD driver
Rafael already indicated that he wants to merge 1/8 (and presumably also 2/8)
through his tree and that he will provide an immutable branch with those
for merging into the pdx86 tree.
4/8 and 6/8 are both gpiolib-acpi patches and seem to be ready for merging
now, perhaps the gpiolib-acpi maintainers can already merge these and also
provide an immutable branch ? Andy/Mika ?
3/8 and 5/8 seem to be nice cleanups, but not really necessary. IMHO it
would be best to park these cleanups for later and for 3/8 add the following
where necessary for now:
/* FIXME drop this once the I2C_DEV_NAME_FORMAT macro has been added to include/linux/i2c.h */
#ifndef I2C_DEV_NAME_FORMAT
#define I2C_DEV_NAME_FORMAT "i2c-%s"
#endif
This is not the prettiest but it reduces all the subsys cross-deps and things
like this have been done before for similar reasons.
Likewise it would be good if you can add if (foo) as condition before any
clkdev_drop(foo) calls in this patch-set and then merge
5/8 "clkdev: Make clkdev_drop() null aware" independently of this and then
once both are in Linux tree follow-up with a cleanup patch dropping the if (foo)
guards.
So this would leave as deps for 7/8 just the 2 ACPI and 2 gpiolib-acpi patches
which I can hopefully pull-in via immutable branches and then we are good.
AFAICT patch 8/8 can be merged independently once 7/8 hits for-next (IOW once
we are sure the next kernel will have 7/8).
Or alternatively one of the involved subsys maintainers just merges the entire
set (once it is ready) and then provides an immutable branch with the entire set
on top of 5.13-rc1 (or 5.14-rc1). But that requires acks from all the other
subsys maintainers. Note I'm fine with either approach.
Regards,
Hans
> v1 for this series was originally 14-18 of this series:
> https://lore.kernel.org/linux-media/20201130133129.1024662-1-djrscally@gmail.com/T/#m91934e12e3d033da2e768e952ea3b4a125ee3e67
>
> v2 was here:
> https://lore.kernel.org/platform-driver-x86/20210118003428.568892-1-djrscally@gmail.com/
>
> v3 was here:
> https://lore.kernel.org/lkml/20210222130735.1313443-1-djrscally@gmail.com/
>
> Series level changelog:
>
> - Added patch 5/8 to make clkdev_drop() NULL aware to simplify error
> handling.
> - Added patch 6/8 to add acpi_gpio_get_io_resource().
>
> This has been tested on a number of devices, but currently **not** on a device
> designed for ChromeOS, which we ideally need to do to ensure no regression
> caused by replacing the tps68470 MFD driver. Unfortunately, I don't have a
> device to test it on myself.
>
> =========== Original Cover Letter ===========
>
> At the moment in the kernel the ACPI _HID INT3472 is taken by the tps68470
> MFD driver, but that driver can only handle some of the cases of that _HID
> that we see. There are at least these three possibilities:
>
> 1. INT3472 devices that provide GPIOs through the usual framework and run
> power and clocks through an operation region; this is the situation that
> the current module handles and is seen on ChromeOS devices
> 2. INT3472 devices that provide GPIOs, plus clocks and regulators that are
> meant to be driven through the usual frameworks, usually seen on devices
> designed to run Windows
> 3. INT3472 devices that don't actually represent a physical tps68470, but
> are being used as a convenient way of grouping a bunch of system GPIO
> lines that are intended to enable power and clocks for sensors which
> are called out as dependent on them. Also seen on devices designed to
> run Windows.
>
> This series introduces a new module which registers:
>
> 1. An i2c driver that determines which scenario (#1 or #2) applies to the
> machine and registers platform devices to be bound to GPIO, OpRegion,
> clock and regulator drivers as appropriate.
> 2. A platform driver that binds to the dummy INT3472 devices described in
> #3
>
> The platform driver for the dummy device registers the GPIO lines that
> enable the clocks and regulators to the sensors via those frameworks so
> that sensor drivers can consume them in the usual fashion. The existing
> GPIO and OpRegion tps68470 drivers will work with the i2c driver that's
> registered. Clock and regulator drivers are available but have not so far been
> tested, so aren't part of this series.
>
> The existing mfd/tps68470.c driver being thus superseded, it is removed.
>
> Thanks
> Dan
>
> Daniel Scally (8):
> ACPI: scan: Extend acpi_walk_dep_device_list()
> ACPI: scan: Add function to fetch dependent of acpi device
> i2c: core: Add a format macro for I2C device names
> gpiolib: acpi: Export acpi_get_gpiod()
> clkdev: Make clkdev_drop() null aware
> gpiolib: acpi: Add acpi_gpio_get_io_resource()
> platform/x86: Add intel_skl_int3472 driver
> mfd: tps68470: Remove tps68470 MFD driver
>
> MAINTAINERS | 5 +
> drivers/acpi/ec.c | 2 +-
> drivers/acpi/pmic/Kconfig | 2 +-
> drivers/acpi/pmic/intel_pmic_chtdc_ti.c | 2 +-
> drivers/acpi/scan.c | 107 ++++-
> drivers/clk/clkdev.c | 3 +
> drivers/gpio/Kconfig | 2 +-
> drivers/gpio/gpiolib-acpi.c | 61 ++-
> drivers/i2c/i2c-core-acpi.c | 8 +-
> drivers/i2c/i2c-core-base.c | 4 +-
> drivers/mfd/Kconfig | 18 -
> drivers/mfd/Makefile | 1 -
> drivers/mfd/tps68470.c | 97 -----
> drivers/platform/surface/aggregator/core.c | 6 +-
> drivers/platform/surface/surface3_power.c | 22 +-
> .../platform/surface/surface_acpi_notify.c | 7 +-
> drivers/platform/x86/Kconfig | 2 +
> drivers/platform/x86/Makefile | 1 +
> drivers/platform/x86/intel-int3472/Kconfig | 31 ++
> drivers/platform/x86/intel-int3472/Makefile | 5 +
> .../intel_skl_int3472_clk_and_regulator.c | 195 +++++++++
> .../intel-int3472/intel_skl_int3472_common.c | 106 +++++
> .../intel-int3472/intel_skl_int3472_common.h | 113 +++++
> .../intel_skl_int3472_discrete.c | 409 ++++++++++++++++++
> .../intel_skl_int3472_tps68470.c | 109 +++++
> include/acpi/acpi_bus.h | 8 +
> include/linux/acpi.h | 11 +-
> include/linux/gpio/consumer.h | 2 +
> include/linux/i2c.h | 3 +
> 29 files changed, 1175 insertions(+), 167 deletions(-)
> delete mode 100644 drivers/mfd/tps68470.c
> create mode 100644 drivers/platform/x86/intel-int3472/Kconfig
> create mode 100644 drivers/platform/x86/intel-int3472/Makefile
> create mode 100644 drivers/platform/x86/intel-int3472/intel_skl_int3472_clk_and_regulator.c
> create mode 100644 drivers/platform/x86/intel-int3472/intel_skl_int3472_common.c
> create mode 100644 drivers/platform/x86/intel-int3472/intel_skl_int3472_common.h
> create mode 100644 drivers/platform/x86/intel-int3472/intel_skl_int3472_discrete.c
> create mode 100644 drivers/platform/x86/intel-int3472/intel_skl_int3472_tps68470.c
>
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