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rtc: add generic nvmem support

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Many RTCs have an on board non volatile storage. It can be battery backed
RAM or an EEPROM. Use the nvmem subsystem to export it to both userspace
and in-kernel consumers.

This stays compatible with the previous (non documented) ABI that was using
/sys/class/rtc/rtcx/device/nvram to export that memory. But will warn about
the deprecation.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Alexandre Belloni 2017-07-06 11:42:02 +02:00
parent 735ae2056b
commit 697e5a47aa
7 changed files with 143 additions and 0 deletions
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4
drivers/rtc/class.c
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@ -290,6 +290,8 @@ EXPORT_SYMBOL_GPL(rtc_device_register);
*/
void rtc_device_unregister(struct rtc_device *rtc)
{
rtc_nvmem_unregister(rtc);
mutex_lock(&rtc->ops_lock);
/*
* Remove innards of this RTC, then disable it, before
@ -448,6 +450,8 @@ int __rtc_register_device(struct module *owner, struct rtc_device *rtc)
rtc_proc_add_device(rtc);
rtc_nvmem_register(rtc);
rtc->registered = true;
dev_info(rtc->dev.parent, "registered as %s\n",
dev_name(&rtc->dev));