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Subject[PATCH v2 3/7] soc/tegra: pmc: Implement tegra_io_pad_is_powered()
Date
Implement a function to query whether a pad is in deep power down mode.

Signed-off-by: Aapo Vienamo <avienamo@nvidia.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
---
drivers/soc/tegra/pmc.c | 17 +++++++++++++++++
include/soc/tegra/pmc.h | 1 +
2 files changed, 18 insertions(+)

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index 393ca72..fa47e7a 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -1075,6 +1075,23 @@ int tegra_io_pad_power_disable(enum tegra_io_pad id)
}
EXPORT_SYMBOL(tegra_io_pad_power_disable);

+int tegra_io_pad_is_powered(enum tegra_io_pad id)
+{
+ unsigned long request, status;
+ u32 mask;
+ u32 value;
+ int err;
+
+ err = tegra_io_pad_get_dpd_register_bit(id, &request, &status, &mask);
+ if (err)
+ return err;
+
+ value = tegra_pmc_readl(status);
+
+ return !(value & mask);
+}
+EXPORT_SYMBOL(tegra_io_pad_is_powered);
+
int tegra_io_pad_set_voltage(enum tegra_io_pad id,
enum tegra_io_pad_voltage voltage)
{
diff --git a/include/soc/tegra/pmc.h b/include/soc/tegra/pmc.h
index 445aa66..14206e8 100644
--- a/include/soc/tegra/pmc.h
+++ b/include/soc/tegra/pmc.h
@@ -163,6 +163,7 @@ int tegra_powergate_sequence_power_up(unsigned int id, struct clk *clk,

int tegra_io_pad_power_enable(enum tegra_io_pad id);
int tegra_io_pad_power_disable(enum tegra_io_pad id);
+int tegra_io_pad_is_powered(enum tegra_io_pad id);
int tegra_io_pad_set_voltage(enum tegra_io_pad id,
enum tegra_io_pad_voltage voltage);
int tegra_io_pad_get_voltage(enum tegra_io_pad id);
--
2.7.4
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