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soc/tegra: pmc: Implement tegra_io_pad_is_powered()

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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>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Aapo Vienamo 2018-08-10 21:08:09 +03:00 committed by Thierry Reding
parent 00ead3c913
commit f142b9d646
1 changed files with 15 additions and 0 deletions
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15
drivers/soc/tegra/pmc.c
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@ -1075,6 +1075,21 @@ unlock:
} }
EXPORT_SYMBOL(tegra_io_pad_power_disable); 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, int tegra_io_pad_set_voltage(enum tegra_io_pad id,
enum tegra_io_pad_voltage voltage) enum tegra_io_pad_voltage voltage)
{ {