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+What: /sys/bus/platform/devices/*/srpd
+Date: July 2022
+KernelVersion: 5.21
+Contact: Florian Fainelli <f.fainelli@gmail.com>
+Description:
+ Self Refresh Power Down (SRPD) inactivity timeout counted in
+ internal DDR controller clock cycles. Possible values range
+ from 0 (disable inactivity timeout) to 65535 (0xffff).
+
+What: /sys/bus/platform/devices/*/frequency
+Date: July 2022
+KernelVersion: 5.21
+Contact: Florian Fainelli <f.fainelli@gmail.com>
+Description:
+ DDR PHY frequency in Hz.