clk: clk: Add clk_gate_restore_context function

Keerthyj · Tero Kristo · commit 435365485f40 · 2018-10-03T15:29:15.000+03:00
The clock gate restore context function enables or disables
the gate clocks based on the enable_count. This is done in cases
where the clock context is lost and based on the enable_count
the clock either needs to be enabled/disabled.

Signed-off-by: Keerthy &lt;j-keerthy@ti.com&gt;
Acked-by: Tony Lindgren &lt;tony@atomide.com&gt;
Signed-off-by: Tero Kristo &lt;t-kristo@ti.com&gt;
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
@@ -923,6 +923,25 @@ static int clk_core_enable_lock(struct clk_core *core)
 	return ret;
 }
 
+/**
+ * clk_gate_restore_context - restore context for poweroff
+ * @hw: the clk_hw pointer of clock whose state is to be restored
+ *
+ * The clock gate restore context function enables or disables
+ * the gate clocks based on the enable_count. This is done in cases
+ * where the clock context is lost and based on the enable_count
+ * the clock either needs to be enabled/disabled. This
+ * helps restore the state of gate clocks.
+ */
+void clk_gate_restore_context(struct clk_hw *hw)
+{
+	if (hw->clk->core->enable_count)
+		hw->clk->core->ops->enable(hw);
+	else
+		hw->clk->core->ops->disable(hw);
+}
+EXPORT_SYMBOL_GPL(clk_gate_restore_context);
+
 static int _clk_save_context(struct clk_core *clk)
 {
 	struct clk_core *child;
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
@@ -1018,5 +1018,7 @@ static inline void clk_writel(u32 val, u32 __iomem *reg)
 
 #endif	/* platform dependent I/O accessors */
 
+void clk_gate_restore_context(struct clk_hw *hw);
+
 #endif /* CONFIG_COMMON_CLK */
 #endif /* CLK_PROVIDER_H */
