linux-kernel - Re: [PATCH v2 0/6] Support Spi in i2c-multi-instantiate driver

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Date:   Tue, 21 Dec 2021 19:16:28 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Stefan Binding <sbinding@...nsource.cirrus.com>,
        Mark Brown <broonie@...nel.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Mark Gross <markgross@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-acpi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        patches@...nsource.cirrus.com
Subject: Re: [PATCH v2 0/6] Support Spi in i2c-multi-instantiate driver

Hi Stefan,

On 12/10/21 16:40, Stefan Binding wrote:
> Add support for SPI bus in the ic2-multi-instantiate driver as
> upcoming laptops will need to multi instantiate SPI devices from
> a single device node, which has multiple SpiSerialBus entries at
> the ACPI table.
> 
> With the new SPI support, i2c-multi-instantiate becomes
> bus-multi-instantiate and is moved to the ACPI folder.
> 
> The intention is to support the SPI bus by re-using the current
> I2C multi instantiate, instead of creating a new SPI multi
> instantiate, to make it possible for peripherals that can be
> controlled by I2C or SPI to have the same HID at the ACPI table.
> 
> The new driver (Bus multi instantiate, bmi) checks for the
> hard-coded bus type and returns -ENODEV in case of zero devices
> found for that bus. In the case of automatic bus detection, 
> the driver will give preference to I2C.
> 
> The expectation is for a device node in the ACPI table to have
> multiple I2cSerialBus only or multiple SpiSerialBus only, not
> a mix of both; and for the case where there are both entries in
> one device node, only the I2C ones would be probed.
> 
> This new bus multi instantiate will be used in CS35L41 HDA new
> driver, being upstreamed:
> https://lkml.org/lkml/2021/11/23/723

Patches 1-5 look good to me and are:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Rafael, you may also consider this as my ack for merging this
series through the ACPI subsys branches.

But I do have some remarks on patch 6 which should be
addressed first.

Regards,

Hans



> 
> Changes since V1:
>  - Added Cover Letter
>  - Split SPI patch into move, rename, reorganize and add
>    SPI support
>  - Hard coded BUS type for better decison making at bmi_probe
>  - Driver moved to acpi folder
>  - Change to use acpi_spi_find_controller_by_adev
>  - New shared function bmi_get_irq for I2C and SPI
> 
> 
> Lucas Tanure (3):
>   platform/x86: i2c-multi-instantiate: Move it to drivers/acpi folder
>   ACPI: i2c-multi-instantiate: Rename it for a generic bus driver name
>   ACPI: bus-multi-instantiate: Reorganize I2C functions
> 
> Stefan Binding (3):
>   spi: Export acpi_spi_find_controller_by_adev to be used externally
>   spi: Make spi_alloc_device and spi_add_device public again
>   ACPI: bus-multi-instantiate: Add SPI support
> 
>  MAINTAINERS                                  |   4 +-
>  drivers/acpi/Kconfig                         |  11 +
>  drivers/acpi/Makefile                        |   1 +
>  drivers/acpi/bus-multi-instantiate.c         | 500 +++++++++++++++++++
>  drivers/acpi/scan.c                          |  19 +-
>  drivers/platform/x86/Kconfig                 |  11 -
>  drivers/platform/x86/Makefile                |   1 -
>  drivers/platform/x86/i2c-multi-instantiate.c | 174 -------
>  drivers/spi/spi.c                            |   9 +-
>  include/linux/spi/spi.h                      |  22 +
>  10 files changed, 552 insertions(+), 200 deletions(-)
>  create mode 100644 drivers/acpi/bus-multi-instantiate.c
>  delete mode 100644 drivers/platform/x86/i2c-multi-instantiate.c
>