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mfd: Add ACPI support

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If an MFD device is backed by ACPI namespace, we should allow subdevice
drivers to access their corresponding ACPI companion devices through normal
means (e.g using ACPI_COMPANION()).

This patch adds such support to the MFD core. If the MFD parent device
does not specify any ACPI _HID/_CID for the child device, the child
device will share the parent ACPI companion device. Otherwise the child
device will be assigned with the corresponding ACPI companion, if found
in the namespace below the parent.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Mika Westerberg 2014-09-16 14:52:36 +03:00 • committed by Lee Jones
parent 7be180cc7a
commit 6ab3430129
3 changed files with 70 additions and 0 deletions
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3
include/linux/mfd/core.h
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@ -44,6 +44,9 @@ struct mfd_cell {
*/
const char *of_compatible;
/* Matches ACPI PNP id, either _HID or _CID */
const char *acpi_pnpid;
/*
* These resources can be specified relative to the parent device.
* For accessing hardware you should use resources from the platform dev