linux-kernel - [PATCH v5 3/7] soc/tegra: pmc: Implement tegra_io_pad_is

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Date:   Fri, 20 Jul 2018 13:59:11 +0300
From:   Aapo Vienamo <avienamo@...dia.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>
CC:     Aapo Vienamo <avienamo@...dia.com>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v5 3/7] soc/tegra: pmc: Implement tegra_io_pad_is_powered()

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

Signed-off-by: Aapo Vienamo <avienamo@...dia.com>
Acked-by: Jon Hunter <jonathanh@...dia.com>
---
 drivers/soc/tegra/pmc.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index 393ca72..784c182 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -1075,6 +1075,22 @@ 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;
+	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);
+}
+
 int tegra_io_pad_set_voltage(enum tegra_io_pad id,
 			     enum tegra_io_pad_voltage voltage)
 {
-- 
2.7.4