[PATCH v3 07/38] soc/tegra: pmc: Implement tegra_io_pad_is_powered()

Aapo Vienamo
2018-08-30T15:06:08Z

Implement a function to query whether a pad is in deep power down mode.
This is needed by the pinctrl callbacks.

Signed-off-by: Aapo Vienamo <avienamo@nvidia.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
---
drivers/soc/tegra/pmc.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index f88bcb60430b..eb9385fa88c4 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -1075,6 +1075,21 @@ int tegra_io_pad_power_disable(enum tegra_io_pad id)
}
EXPORT_SYMBOL(tegra_io_pad_power_disable);

+static int tegra_io_pad_is_powered(enum tegra_io_pad id)
+{
+ unsigned long request, status;
+ u32 mask, 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);
+}
+
int tegra_io_pad_set_voltage(enum tegra_io_pad id,
enum tegra_io_pad_voltage voltage)
{
--
2.18.0