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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>
21 lines
596 B
Text
21 lines
596 B
Text
What: /sys/bus/nvmem/devices/.../nvmem
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Date: July 2015
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KernelVersion: 4.2
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Contact: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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Description:
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This file allows user to read/write the raw NVMEM contents.
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Permissions for write to this file depends on the nvmem
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provider configuration.
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Note: This file is only present if CONFIG_NVMEM_SYSFS
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is enabled
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ex:
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hexdump /sys/bus/nvmem/devices/qfprom0/nvmem
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0000000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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00000a0 db10 2240 0000 e000 0c00 0c00 0000 0c00
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0000000 0000 0000 0000 0000 0000 0000 0000 0000
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...
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*
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0001000
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