diff mbox series

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

Message ID 20180830150639.21048-8-avienamo@nvidia.com
State Accepted
Headers show
Series Tegra SDHCI add support for HS200 and UHS signaling | expand

Commit Message

Aapo Vienamo Aug. 30, 2018, 3:06 p.m. UTC 
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 mbox series

Patch

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)
 {