[U-Boot] [PATCH v2] sunxi: axp2xx: disable ldoio0/1 at boot

[U-Boot] [PATCH v2] sunxi: axp2xx: disable ldoio0/1 at boot

[Hans de Goede]

When cold-booting the ldoio0/1 regulators are always off / the
gpios are always at tristate. But when re-booting from android these
are sometimes on. Disable them at axp_init time (iow as early as possible)
to remove this difference between a cold boot and a reboot.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
-Do not or pmic_bus_write results together
---
 drivers/power/axp209.c | 16 ++++++++++++++++
 drivers/power/axp221.c | 12 ++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/power/axp209.c b/drivers/power/axp209.c
index fc162a1..731b75e 100644
--- a/drivers/power/axp209.c
+++ b/drivers/power/axp209.c
@@ -167,6 +167,22 @@ int axp_init(void)
 			return rc;
 	}
 
+	/*
+	 * Turn off LDOIO regulators / tri-state GPIO pins, when rebooting
+	 * from android these are sometimes on.
+	 */
+	rc = pmic_bus_write(AXP_GPIO0_CTRL, AXP_GPIO_CTRL_INPUT);
+	if (rc)
+		return rc;
+
+	rc = pmic_bus_write(AXP_GPIO1_CTRL, AXP_GPIO_CTRL_INPUT);
+	if (rc)
+		return rc;
+
+	rc = pmic_bus_write(AXP_GPIO2_CTRL, AXP_GPIO_CTRL_INPUT);
+	if (rc)
+		return rc;
+
 	return 0;
 }
 
diff --git a/drivers/power/axp221.c b/drivers/power/axp221.c
index 727ab09..109d3f4 100644
--- a/drivers/power/axp221.c
+++ b/drivers/power/axp221.c
@@ -223,6 +223,18 @@ int axp_init(void)
 	if (!(axp_chip_id == 0x6 || axp_chip_id == 0x7 || axp_chip_id == 0x17))
 		return -ENODEV;
 
+	/*
+	 * Turn off LDOIO regulators / tri-state GPIO pins, when rebooting
+	 * from android these are sometimes on.
+	 */
+	ret = pmic_bus_write(AXP_GPIO0_CTRL, AXP_GPIO_CTRL_INPUT);
+	if (ret)
+		return ret;
+
+	ret = pmic_bus_write(AXP_GPIO1_CTRL, AXP_GPIO_CTRL_INPUT);
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
-- 
2.9.3

[U-Boot] [PATCH v2] sunxi: axp2xx: disable ldoio0/1 at boot

[Ian Campbell]

On Mon, 2016-09-12 at 15:24 +0200, Hans de Goede wrote:
> When cold-booting the ldoio0/1 regulators are always off / the
> gpios are always at tristate. But when re-booting from android these
> are sometimes on. Disable them at axp_init time (iow as early as
> possible)
> to remove this difference between a cold boot and a reboot.
> 
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Acked-by: Ian Campbell <ijc@hellion.org.uk>