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Date:   Sun, 9 Dec 2018 14:11:32 +0800
From:   fuyao <fuyao@allwinnertech.com>
To:     linux-kernel@vger.kernel.org
Subject: some to support pm_trace
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there is PM_TRACE for X86 use RTC register, which can debug suspend
convenient.
recently i want to use it with arm. is there a subsystem to support it.