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@@ -144,6 +144,8 @@ extern u64 timecounter_cyc2time(struct timecounter *tc,
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* The ideal clocksource. A must-use where
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* available.
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* @read: returns a cycle value, passes clocksource as argument
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+ * @enable: optional function to enable the clocksource
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+ * @disable: optional function to disable the clocksource
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* @mask: bitmask for two's complement
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* subtraction of non 64 bit counters
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* @mult: cycle to nanosecond multiplier (adjusted by NTP)
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@@ -163,6 +165,8 @@ struct clocksource {
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struct list_head list;
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int rating;
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cycle_t (*read)(struct clocksource *cs);
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+ int (*enable)(struct clocksource *cs);
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+ void (*disable)(struct clocksource *cs);
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cycle_t mask;
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u32 mult;
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u32 mult_orig;
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@@ -274,6 +278,33 @@ static inline cycle_t clocksource_read(struct clocksource *cs)
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return cs->read(cs);
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}
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+/**
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+ * clocksource_enable: - enable clocksource
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+ * @cs: pointer to clocksource
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+ *
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+ * Enables the specified clocksource. The clocksource callback
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+ * function should start up the hardware and setup mult and field
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+ * members of struct clocksource to reflect hardware capabilities.
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+ */
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+static inline int clocksource_enable(struct clocksource *cs)
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+{
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+ return cs->enable ? cs->enable(cs) : 0;
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+}
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+
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+/**
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+ * clocksource_disable: - disable clocksource
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+ * @cs: pointer to clocksource
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+ *
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+ * Disables the specified clocksource. The clocksource callback
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+ * function should power down the now unused hardware block to
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+ * save power.
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+ */
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+static inline void clocksource_disable(struct clocksource *cs)
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+{
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+ if (cs->disable)
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+ cs->disable(cs);
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+}
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+
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/**
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* cyc2ns - converts clocksource cycles to nanoseconds
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* @cs: Pointer to clocksource
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