kernel/linux.git/drivers/base/soc.c, branch v4.10.2

base: soc: Check for NULL SoC device attributes

2016-11-10T09:10:33+00:00

If soc_device_match() is used to check the value of a specific attribute that is not present for the current SoC, the kernel crashes with a NULL pointer dereference. Fix this by explicitly checking for the absence of a needed property, and considering this a non-match. Signed-off-by: Geert Uytterhoeven Acked-by: Arnd Bergmann Acked-by: Greg Kroah-Hartman

base: soc: Introduce soc_device_match() interface

2016-11-10T09:10:29+00:00

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 Signed-off-by: Yangbo Lu Signed-off-by: Geert Uytterhoeven Acked-by: Greg Kroah-Hartman

base: soc: Early register bus when needed

2016-11-10T09:10:25+00:00

If soc_device_register() is called before soc_bus_register(), it crashes with a NULL pointer dereference. soc_bus_register() is already a core_initcall(), but drivers/base/ is entered later than e.g. drivers/pinctrl/ and drivers/soc/. Hence there are several subsystems that may need to know SoC revision information, while it's not so easy to initialize the SoC bus even earlier using an initcall. To fix this, let soc_device_register() register the bus early if that hasn't happened yet. Signed-off-by: Geert Uytterhoeven Acked-by: Arnd Bergmann

base: soc: make it explicitly non-modular

2016-08-31T13:13:56+00:00

The Kconfig currently controlling compilation of this code is: drivers/base/Kconfig:config SOC_BUS drivers/base/Kconfig: bool ...meaning that it currently is not being built as a module by anyone. Lets remove the modular code that is essentially orphaned, so that when reading the driver there is no doubt it is builtin-only. Since module_init was not in use by this code, the init ordering remains unchanged with this commit. Cc: Lee Jones Cc: Greg Kroah-Hartman Signed-off-by: Paul Gortmaker Signed-off-by: Greg Kroah-Hartman

base: soc: siplify ida usage

2015-10-04T18:42:22+00:00

Simplify ida index allocation and removal by using the ida_simple_* helper functions Signed-off-by: Lee Duncan Reviewed-by: Johannes Thumshirn Signed-off-by: Greg Kroah-Hartman

drivers/base: use tabs where possible in code indentation

2015-03-25T13:37:35+00:00

Linux kernel coding style require that tabs should be used instead of spaces for code indentation. Problem found using checkpatch.pl script. Signed-off-by: Lavinia Tache Signed-off-by: Greg Kroah-Hartman

mode_t whack-a-mole: ->is_visible() returns umode_t...

2012-05-30T03:28:42+00:00

Signed-off-by: Al Viro

drivers/base: fix compiler warning in SoC export driver - idr should be ida

2012-04-09T21:54:22+00:00

This fixes: note: expected ‘struct ida *’ but argument is of type ‘struct idr *’ warning: passing argument 1 of ‘ida_pre_get’ from incompatible pointer type Reported-by: Arnd Bergman Cc: Greg Kroah-Hartman Signed-off-by: Lee Jones Signed-off-by: Axel Lin Acked-by: Arnd Bergmann Signed-off-by: Greg Kroah-Hartman

drivers/base: Remove unneeded spin_lock_init call for soc_lock

2012-04-09T21:54:22+00:00

soc_lock is already initialized by DEFINE_SPINLOCK. Signed-off-by: Axel Lin Signed-off-by: Greg Kroah-Hartman

drivers/base: add bus for System-on-Chip devices

2012-02-10T19:42:25+00:00

Traditionally, any System-on-Chip based platform creates a flat list of platform_devices directly under /sys/devices/platform. In order to give these some better structure, this introduces a new bus type for soc_devices that are registered with the new soc_device_register() function. All devices that are on the same chip should then be registered as child devices of the soc device. The soc bus also exports a few standardised device attributes which allow user space to query the specific type of soc. Signed-off-by: Lee Jones Signed-off-by: Greg Kroah-Hartman