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authorArnd Bergmann <arnd@arndb.de>2016-09-21 08:57:19 +0200
committerGeert Uytterhoeven <geert+renesas@glider.be>2016-11-10 10:10:29 +0100
commitc97db7cc7778e34a53b42d58c766f0ec0e30d580 (patch)
tree01cd10620028f0261ef411bbfec435ab6a64bef8 /drivers/pnp/isapnp
parentbase: soc: Early register bus when needed (diff)
downloadlinux-c97db7cc7778e34a53b42d58c766f0ec0e30d580.tar.xz
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base: soc: Introduce soc_device_match() interface
We keep running into cases where device drivers want to know the exact version of the a SoC they are currently running on. In the past, this has usually been done through a vendor specific API that can be called by a driver, or by directly accessing some kind of version register that is not part of the device itself but that belongs to a global register area of the chip. Common reasons for doing this include: - A machine is not using devicetree or similar for passing data about on-chip devices, but just announces their presence using boot-time platform devices, and the machine code itself does not care about the revision. - There is existing firmware or boot loaders with existing DT binaries with generic compatible strings that do not identify the particular revision of each device, but the driver knows which SoC revisions include which part. - A prerelease version of a chip has some quirks and we are using the same version of the bootloader and the DT blob on both the prerelease and the final version. An update of the DT binding seems inappropriate because that would involve maintaining multiple copies of the dts and/or bootloader. This patch introduces the soc_device_match() interface that is meant to work like of_match_node() but instead of identifying the version of a device, it identifies the SoC itself using a vendor-agnostic interface. Unlike of_match_node(), we do not do an exact string compare but instead use glob_match() to allow wildcards in strings. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/pnp/isapnp')
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