This function will be used by Tegra30 CPUIDLE driver to determine whether
CPU could be power-gated.
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
drivers/clk/tegra/clk-tegra20-emc.c | 14 ++++++++++++++
include/linux/clk/tegra.h | 1 +
2 files changed, 15 insertions(+)
diff --git a/drivers/clk/tegra/clk-tegra20-emc.c b/drivers/clk/tegra/clk-tegra20-emc.c
index 03bf0009a33c..ace7150d5cc1 100644
--- a/drivers/clk/tegra/clk-tegra20-emc.c
+++ b/drivers/clk/tegra/clk-tegra20-emc.c
@@ -291,3 +291,17 @@ int tegra20_clk_prepare_emc_mc_same_freq(struct clk *emc_clk, bool same)
return 0;
}
+
+bool tegra20_clk_emc_on_pllp(void)
+{
+ struct clk *clk = __clk_lookup("emc");
+ struct clk_hw *hw;
+
+ if (clk) {
+ hw = __clk_get_hw(clk);
+
+ return emc_get_parent(hw) == EMC_SRC_PLL_P;
+ }
+
+ return true;
+}
diff --git a/include/linux/clk/tegra.h b/include/linux/clk/tegra.h
index 6a7cbc3cfadc..c862447ffada 100644
--- a/include/linux/clk/tegra.h
+++ b/include/linux/clk/tegra.h
@@ -129,5 +129,6 @@ typedef long (tegra20_clk_emc_round_cb)(unsigned long rate,
void tegra20_clk_set_emc_round_callback(tegra20_clk_emc_round_cb *round_cb,
void *cb_arg);
int tegra20_clk_prepare_emc_mc_same_freq(struct clk *emc_clk, bool same);
+bool tegra20_clk_emc_on_pllp(void);
#endif /* __LINUX_CLK_TEGRA_H_ */
--
2.22.0
