linux-kernel - [PATCH v2 3/5] mfd: palmas: Reset the POWERHOLD mux during power off

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Message-ID: <1478754560-27923-4-git-send-email-j-keerthy@ti.com>
Date:   Thu, 10 Nov 2016 10:39:18 +0530
From:   Keerthy <j-keerthy@...com>
To:     <tony@...mide.com>, <lee.jones@...aro.org>, <robh+dt@...nel.org>
CC:     <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <nm@...com>, <j-keerthy@...com>, <t-kristo@...com>
Subject: [PATCH v2 3/5] mfd: palmas: Reset the POWERHOLD mux during power off

POWERHOLD signal has higher priority  over the DEV_ON bit.
So power off will not happen if the POWERHOLD is held high.
Hence reset the MUX to GPIO_7 mode to release the POWERHOLD
and the DEV_ON bit to take effect to power off the PMIC.

PMIC Power off happens in dire situations like thermal shutdown
so irrespective of the POWERHOLD setting go ahead and turn off
the powerhold.  Currently poweroff is broken on boards that have
powerhold enabled. This fixes poweroff on those boards.

Signed-off-by: Keerthy <j-keerthy@...com>
---

Changes in v2:

  * Changed pr_err to dev_err
  * removed redundant boolean variable override-powerhold

 drivers/mfd/palmas.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/mfd/palmas.c b/drivers/mfd/palmas.c
index ee9e9ea..da90124 100644
--- a/drivers/mfd/palmas.c
+++ b/drivers/mfd/palmas.c
@@ -430,6 +430,20 @@ static void palmas_power_off(void)
 {
 	unsigned int addr;
 	int ret, slave;
+	struct device_node *np = palmas_dev->dev->of_node;
+
+	if (of_property_read_bool(np, "ti,palmas-override-powerhold")) {
+		addr = PALMAS_BASE_TO_REG(PALMAS_PU_PD_OD_BASE,
+					  PALMAS_PRIMARY_SECONDARY_PAD2);
+		slave = PALMAS_BASE_TO_SLAVE(PALMAS_PU_PD_OD_BASE);
+
+		ret = regmap_update_bits(palmas_dev->regmap[slave], addr,
+				PALMAS_PRIMARY_SECONDARY_PAD2_GPIO_7_MASK, 0);
+		if (ret)
+			dev_err(palmas_dev->dev,
+				"Unable to write PRIMARY_SECONDARY_PAD2 %d\n",
+				ret);
+	}
 
 	slave = PALMAS_BASE_TO_SLAVE(PALMAS_PMU_CONTROL_BASE);
 	addr = PALMAS_BASE_TO_REG(PALMAS_PMU_CONTROL_BASE, PALMAS_DEV_CTRL);
-- 
1.9.1