linux-kernel - [PATCH v2 0/1] i2c: acpi: scan ACPI enumerated I2C mux channels

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Date:	Mon, 19 Oct 2015 02:01:51 -0700
From:	Dustin Byford <dustin@...ulusnetworks.com>
To:	Wolfram Sang <wsa@...-dreams.de>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	rjw@...ysocki.net, andriy.shevchenko@...ux.intel.com
Subject: [PATCH v2 0/1] i2c: acpi: scan ACPI enumerated I2C mux channels

The following patch adds support for describing ACPI enumerated I2C mux ports
like this (added as Documentation/acpi/i2c-muxes.txt):

+------+   +------+
| SMB1 |-->| MUX0 |--CH00--> i2c client A (0x50)
|      |   | 0x70 |--CH01--> i2c client B (0x50)
+------+   +------+

Device (SMB1)
{
    Name (_HID, ...)
    Device (MUX0)
    {
        Name (_HID, ...)
        Name (_CRS, ResourceTemplate () {
            I2cSerialBus (0x70, ControllerInitiated, I2C_SPEED,
                          AddressingMode7Bit, "^SMB1", 0x00,
                          ResourceConsumer,,)
        }

        Device (CH00)
        {
            Name (_ADR, 0)

            Device (CLIA)
            {
                Name (_HID, ...)
                Name (_CRS, ResourceTemplate () {
                    I2cSerialBus (0x50, ControllerInitiated, I2C_SPEED,
                                  AddressingMode7Bit, "^CH00", 0x00,
                                  ResourceConsumer,,)
                }
            }
        }

        Device (CH01)
        {
            Name (_ADR, 1)

            Device (CLIB)
            {
                Name (_HID, ...)
                Name (_CRS, ResourceTemplate () {
                    I2cSerialBus (0x50, ControllerInitiated, I2C_SPEED,
                                  AddressingMode7Bit, "^CH01", 0x00,
                                  ResourceConsumer,,)
                }
            }
        }
    }
}

v2:
- Drop duplicate patch already submitted by Andy Shevchenko (i2c / ACPI:
  Rework I2C device scanning)
- Whitespace cleanup suggested by Mika
- Implement a acpi_preset_companion() stub for when CONFIG_ACPI is not set.
- Instead of special casing I2C muxes with regards to enumerating client
  devices, make sure adap->dev always has an ACPI companion.

I based this on linux-pm/bleeding-edge, but now it depends on Andy's change
(i2c / ACPI: Rework I2C device scanning) and I don't know where the rest of
his patch set is going.  Let me know if there's a more appropriate branch
and I'll be happy to rebase.

Dustin Byford (1):
  i2c: add ACPI support for I2C mux ports

 Documentation/acpi/i2c-muxes.txt | 58 ++++++++++++++++++++++++++++++++++++++++
 drivers/i2c/i2c-core.c           | 14 ++++++++--
 drivers/i2c/i2c-mux.c            |  8 ++++++
 include/linux/acpi.h             |  6 +++++
 4 files changed, 84 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/acpi/i2c-muxes.txt

-- 
2.1.4

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