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This patch brings support for the JZ4780 efuse. Currently it only exposes a read only access to the entire 8K bits efuse memory. Tested-by: Mathieu Malaterre <malat@debian.org> Signed-off-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com> Signed-off-by: Mathieu Malaterre <malat@debian.org> Reviewed-by: Paul Cercueil <paul@crapouillou.net> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20200310132257.23358-14-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
16 lines
619 B
Text
16 lines
619 B
Text
What: /sys/devices/*/<our-device>/nvmem
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Date: December 2017
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Contact: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
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Description: read-only access to the efuse on the Ingenic JZ4780 SoC
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The SoC has a one time programmable 8K efuse that is
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split into segments. The driver supports read only.
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The segments are
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0x000 64 bit Random Number
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0x008 128 bit Ingenic Chip ID
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0x018 128 bit Customer ID
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0x028 3520 bit Reserved
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0x1E0 8 bit Protect Segment
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0x1E1 2296 bit HDMI Key
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0x300 2048 bit Security boot key
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Users: any user space application which wants to read the Chip
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and Customer ID
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