linux-kernel - Re: [PATCH v4 2/2] i2c: add ACPI support for I2C mux ports

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Date:	Fri, 23 Oct 2015 11:40:13 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Dustin Byford <dustin@...ulusnetworks.com>
Cc:	Wolfram Sang <wsa@...-dreams.de>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	Jean Delvare <jdelvare@...e.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-i2c@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, rjw@...ysocki.net,
	"Puustinen, Ismo" <ismo.puustinen@...el.com>
Subject: Re: [PATCH v4 2/2] i2c: add ACPI support for I2C mux ports

On Thu, Oct 22, 2015 at 02:17:42AM -0700, Dustin Byford wrote:
> Although I2C mux devices are easily enumerated using ACPI (_HID/_CID or
> device property compatible string match), enumerating I2C client devices
> connected through an I2C mux needs a little extra work.
> 
> This change implements a method for describing an I2C device hierarchy that
> includes mux devices by using an ACPI Device() for each mux channel along
> with an _ADR to set the channel number for the device.  See
> Documentation/acpi/i2c-muxes.txt for a simple example.
> 
> To make this work the ismt, i801, and designware pci/platform devs now
> share an ACPI companion with their I2C adapter dev similar to how it's done
> in OF.  This is done on the assumption that power management functions will
> not be called directly on the I2C dev that is sharing the ACPI node.
> 
> Signed-off-by: Dustin Byford <dustin@...ulusnetworks.com>

This looks good to me.

You did also some stylistic changes to the drivers in question which I
think should be placed to a separate patches.

Regardless of that,

Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

I'll leave this up to Rafael and Wolfram to decide how to go forward
with this patch.
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