summaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
authorKrzysztof Kozlowski <k.kozlowski.k@gmail.com>2015-09-14 15:12:45 +0300
committerLee Jones <lee.jones@linaro.org>2015-10-26 17:49:04 +0300
commitd785334a0d5deff30a487c74324b842d2179553d (patch)
treeb0c19a873b50bd30e50a3ddae23ef0811346f58a /drivers
parent689d4453ed8212ab4a5d53982ac01cbe6531d18a (diff)
downloadlinux-d785334a0d5deff30a487c74324b842d2179553d.tar.xz
mfd: s2mps11: Add manual shutdown method for Odroid XU3
On Odroid XU3 board (with S2MPS11 PMIC) the PWRHOLD bit in CTRL1 register must be manually set to 0 before initiating power off sequence. One of usual power down methods for Exynos based devices looks like: 1. PWRHOLD pin of PMIC is connected to PSHOLD of Exynos SoC. 2. Exynos holds up this pin during system operation. 3. ACOKB pin of PMIC is pulled up to VBATT and optionally to pin in other device. 4. When PWRHOLD/PSHOLD goes low, the PMIC will turn off the power if ACOKB goes high. On Odroid XU3 family the difference is in (3) - the ACOKB is grounded. This means that PMIC must manually set PWRHOLD field to low and then wait for signal from Application Processor (the usual change in PWRHOLD/PSHOLD pin will actually cut off the power). The patch adds respective binding allowing Odroid XU3 device to be powered off. Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com> Reported-by: Anand Moon <linux.amoon@gmail.com> Tested-by: Anand Moon <linux.amoon@gmail.com> Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mfd/sec-core.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
index d206a3e8fe87..2d1137a7a0ee 100644
--- a/drivers/mfd/sec-core.c
+++ b/drivers/mfd/sec-core.c
@@ -278,6 +278,8 @@ static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
* not parsed here.
*/
+ pd->manual_poweroff = of_property_read_bool(dev->of_node,
+ "samsung,s2mps11-acokb-ground");
return pd;
}
#else
@@ -440,6 +442,33 @@ static int sec_pmic_remove(struct i2c_client *i2c)
return 0;
}
+static void sec_pmic_shutdown(struct i2c_client *i2c)
+{
+ struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
+ unsigned int reg, mask;
+
+ if (!sec_pmic->pdata->manual_poweroff)
+ return;
+
+ switch (sec_pmic->device_type) {
+ case S2MPS11X:
+ reg = S2MPS11_REG_CTRL1;
+ mask = S2MPS11_CTRL1_PWRHOLD_MASK;
+ break;
+ default:
+ /*
+ * Currently only one board with S2MPS11 needs this, so just
+ * ignore the rest.
+ */
+ dev_warn(sec_pmic->dev,
+ "Unsupported device %lu for manual power off\n",
+ sec_pmic->device_type);
+ return;
+ }
+
+ regmap_update_bits(sec_pmic->regmap_pmic, reg, mask, 0);
+}
+
#ifdef CONFIG_PM_SLEEP
static int sec_pmic_suspend(struct device *dev)
{
@@ -491,6 +520,7 @@ static struct i2c_driver sec_pmic_driver = {
},
.probe = sec_pmic_probe,
.remove = sec_pmic_remove,
+ .shutdown = sec_pmic_shutdown,
.id_table = sec_pmic_id,
};