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| author | Srinivas Kandagatla <srinivas.kandagatla@linaro.org> | 2019-04-16 10:59:24 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-25 19:44:33 +0200 |
| commit | ae0c2d725512f32a0d1a25f0cf2f07616d33a72e (patch) | |
| tree | efc94c4d7eebd08678b03a27ecd51272da797665 /Documentation/ABI | |
| parent | fc1eb6ebbd55e20819e8ec5f07a2bf71e3bea5f1 (diff) | |
| download | lwn-ae0c2d725512f32a0d1a25f0cf2f07616d33a72e.tar.gz lwn-ae0c2d725512f32a0d1a25f0cf2f07616d33a72e.zip | |
nvmem: core: add NVMEM_SYSFS Kconfig
Many nvmem providers are not very keen on having default sysfs
nvmem entry, as most of the usecases for them are inside kernel
itself. And in some cases read/writes to some areas in nvmem are
restricted and trapped at secure monitor level, so accessing them
from userspace would result in board reboots.
This patch adds new NVMEM_SYSFS Kconfig to make binary sysfs entry
an optional one. This provision will give more flexibility to users.
This patch also moves existing sysfs code to a new file so that its
not compiled in when its not really required.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Gaurav Kohli <gkohli@codeaurora.org>
Tested-by: Gaurav Kohli <gkohli@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/stable/sysfs-bus-nvmem | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-bus-nvmem b/Documentation/ABI/stable/sysfs-bus-nvmem index 5923ab4620c5..9ffba8576f7b 100644 --- a/Documentation/ABI/stable/sysfs-bus-nvmem +++ b/Documentation/ABI/stable/sysfs-bus-nvmem @@ -6,6 +6,8 @@ Description: This file allows user to read/write the raw NVMEM contents. Permissions for write to this file depends on the nvmem provider configuration. + Note: This file is only present if CONFIG_NVMEM_SYSFS + is enabled ex: hexdump /sys/bus/nvmem/devices/qfprom0/nvmem |