From: Lucas Stach <l.stach@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 1/2] ARM: rdu2: config PMIC SW1AB and SW1C rails to 1.375
Date: Mon, 17 Sep 2018 18:36:26 +0200 [thread overview]
Message-ID: <20180917163627.14746-1-l.stach@pengutronix.de> (raw)
This is the default out-of-reset voltage, but if only the i.MX6 SoC
got reset, the PMIC might still be stuck at the lower volatge for the
slow operating point.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
arch/arm/boards/zii-imx6q-rdu2/board.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/arch/arm/boards/zii-imx6q-rdu2/board.c b/arch/arm/boards/zii-imx6q-rdu2/board.c
index f6c908c9f16d..bce221bf8d20 100644
--- a/arch/arm/boards/zii-imx6q-rdu2/board.c
+++ b/arch/arm/boards/zii-imx6q-rdu2/board.c
@@ -137,10 +137,27 @@ late_initcall(rdu2_enable_front_panel_usb);
static int rdu2_devices_init(void)
{
+ struct i2c_client client;
+
if (!of_machine_is_compatible("zii,imx6q-zii-rdu2") &&
!of_machine_is_compatible("zii,imx6qp-zii-rdu2"))
return 0;
+ client.adapter = i2c_get_adapter(1);
+ if (client.adapter) {
+ u8 reg;
+
+ /*
+ * Reset PMIC SW1AB and SW1C rails to 1.375V. If an event
+ * caused only the i.MX6 SoC reset, the PMIC might still be
+ * stuck on the low voltage for the slow operating point.
+ */
+ client.addr = 0x08; /* PMIC i2c address */
+ reg = 0x2b; /* 1.375V, valid for both rails */
+ i2c_write_reg(&client, 0x20, ®, 1);
+ i2c_write_reg(&client, 0x2e, ®, 1);
+ }
+
barebox_set_hostname("rdu2");
imx6_bbu_internal_spi_i2c_register_handler("SPI", "/dev/m25p0.barebox",
--
2.19.0
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next reply other threads:[~2018-09-17 16:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-17 16:36 Lucas Stach [this message]
2018-09-17 16:36 ` [PATCH 2/2] ARM: rdu2: configure the USB port as OTG Lucas Stach
2018-09-17 16:41 ` [PATCH 1/2] ARM: rdu2: config PMIC SW1AB and SW1C rails to 1.375 Lucas Stach
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