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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-11-04 03:28:56 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-11-04 23:58:21 +0300
commitb31384fa5de37a100507751dfb5c0a49d06cee67 (patch)
treefa0084d464b8cb3873c5e169d61ee3c7e8e5b3e6 /drivers/acpi/scan.c
parentffdcd955c3078af3ce117edcfce80fde1a512bed (diff)
downloadlinux-b31384fa5de37a100507751dfb5c0a49d06cee67.tar.xz
Driver core: Unified device properties interface for platform firmware
Add a uniform interface by which device drivers can request device properties from the platform firmware by providing a property name and the corresponding data type. The purpose of it is to help to write portable code that won't depend on any particular platform firmware interface. The following general helper functions are added: device_property_present() device_property_read_u8() device_property_read_u16() device_property_read_u32() device_property_read_u64() device_property_read_string() device_property_read_u8_array() device_property_read_u16_array() device_property_read_u32_array() device_property_read_u64_array() device_property_read_string_array() The first one allows the caller to check if the given property is present. The next 5 of them allow single-valued properties of various types to be retrieved in a uniform way. The remaining 5 are for reading properties with multiple values (arrays of either numbers or strings). The interface covers both ACPI and Device Trees. This change set includes material from Mika Westerberg and Aaron Lu. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Grant Likely <grant.likely@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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