Patchwork [U-Boot,TEST_ONLY,V2,10/10] Pit WIP

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Submitter Ajay Kumar
Date June 26, 2014, 8:01 a.m.
Message ID <1403769668-2026-11-git-send-email-ajaykumar.rs@samsung.com>
Download mbox | patch
Permalink /patch/364298/
State Changes Requested
Delegated to: Minkyu Kang
Headers show

Comments

Ajay Kumar - June 26, 2014, 8:01 a.m.
WIP patch to enable cros-ec on peach_pit.

Signed-off-by: Simon Glass <sjg@chromium.org>
---
 drivers/misc/cros_ec_spi.c            |   4 +-
 drivers/power/pmic/Makefile           |   3 +-
 drivers/power/pmic/pmic_tps65090_ec.c | 212 ++++++++++++++++++++++++++++++++++
 drivers/spi/exynos_spi.c              |   9 +-
 drivers/spi/spi.c                     |   2 +
 include/configs/exynos5-dt.h          |   2 +-
 include/configs/peach-pit.h           |   2 +
 include/power/tps65090_pmic.h         |   6 +
 8 files changed, 232 insertions(+), 8 deletions(-)
 create mode 100644 drivers/power/pmic/pmic_tps65090_ec.c
Wolfgang Denk - June 26, 2014, 8:46 a.m.
Dear Ajay Kumar,

In message <1403769668-2026-11-git-send-email-ajaykumar.rs@samsung.com> you wrote:
> WIP patch to enable cros-ec on peach_pit.

Do you think anybody would be able to figure out what this is supposed
to mean?  I can't...

> @@ -0,0 +1,212 @@
> +/*
> + * Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
> + * Use of this source code is governed by a BSD-style license that can be
> + * found in the LICENSE file.
> + *
> + * Alternatively, this software may be distributed under the terms of the
> + * GNU General Public License ("GPL") version 2 as published by the Free
> + * Software Foundation.
> + */

Please use SPDX license tags, and make sure to use GPL-2.0+ rather
than GPL-2.0

> diff --git a/drivers/spi/exynos_spi.c b/drivers/spi/exynos_spi.c
> index c92276f..2969184 100644
> --- a/drivers/spi/exynos_spi.c
> +++ b/drivers/spi/exynos_spi.c
> @@ -428,10 +428,6 @@ void spi_cs_activate(struct spi_slave *slave)
>  	clrbits_le32(&spi_slave->regs->cs_reg, SPI_SLAVE_SIG_INACT);
>  	debug("Activate CS, bus %d\n", spi_slave->slave.bus);
>  	spi_slave->skip_preamble = spi_slave->mode & SPI_PREAMBLE;
> -
> -	/* Remember time of this transaction so we can honour the bus delay */
> -	if (spi_slave->bus->deactivate_delay_us)
> -		spi_slave->last_transaction_us = timer_get_us();
>  }
>  
>  /**
> @@ -445,6 +441,11 @@ void spi_cs_deactivate(struct spi_slave *slave)
>  	struct exynos_spi_slave *spi_slave = to_exynos_spi(slave);
>  
>  	setbits_le32(&spi_slave->regs->cs_reg, SPI_SLAVE_SIG_INACT);
> +
> +	/* Remember time of this transaction so we can honour the bus delay */
> +	if (spi_slave->bus->deactivate_delay_us)
> +		spi_slave->last_transaction_us = timer_get_us();
> +
>  	debug("Deactivate CS, bus %d\n", spi_slave->slave.bus);
>  }

Is this really a related change, or shoudl that go into a separate
commit?

> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> index 7ddea9b..7d81fbd 100644
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -53,6 +53,8 @@ struct spi_slave *spi_base_setup_slave_fdt(const void *blob, int busnum,
>  		mode |= SPI_CPHA;
>  	if (fdtdec_get_bool(blob, node, "spi-cs-high"))
>  		mode |= SPI_CS_HIGH;
> +	if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
> +		mode |= SPI_PREAMBLE;
>  	return spi_setup_slave(busnum, cs, max_hz, mode);

Ditto?

> diff --git a/include/configs/exynos5-dt.h b/include/configs/exynos5-dt.h
> index e36a031..4e316b9 100644
> --- a/include/configs/exynos5-dt.h
> +++ b/include/configs/exynos5-dt.h
> @@ -37,8 +37,8 @@
>  #define CONFIG_TRACE_EARLY_ADDR		0x50000000
>  
>  /* Keep L2 Cache Disabled */
> -#define CONFIG_SYS_DCACHE_OFF
>  #define CONFIG_SYS_CACHELINE_SIZE	64
> +#define CONFIG_CMD_CACHE

Ditto?

Best regards,

Wolfgang Denk
Ajay kumar - June 26, 2014, 9:05 a.m.
Hi Denk,


On Thu, Jun 26, 2014 at 2:16 PM, Wolfgang Denk <wd@denx.de> wrote:
> Dear Ajay Kumar,
>
> In message <1403769668-2026-11-git-send-email-ajaykumar.rs@samsung.com> you wrote:
>> WIP patch to enable cros-ec on peach_pit.
This Entire patch is a TEST_ONLY since it is still WIP(Work In Progress).
That would mean somebody else is already working on it, but he/she hasn't sent
that patchset yet, and till that comes up in the mailing list, this WIP patch
can be used for testing the dependent patches.
So, this would not be merged into the tree, but I thought its better to send
it with a TEST_ONLY tag, so that maintainers can test this patchset.

Regards,
Ajay Kumar

> Do you think anybody would be able to figure out what this is supposed
> to mean?  I can't...
>
>> @@ -0,0 +1,212 @@
>> +/*
>> + * Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
>> + * Use of this source code is governed by a BSD-style license that can be
>> + * found in the LICENSE file.
>> + *
>> + * Alternatively, this software may be distributed under the terms of the
>> + * GNU General Public License ("GPL") version 2 as published by the Free
>> + * Software Foundation.
>> + */
>
> Please use SPDX license tags, and make sure to use GPL-2.0+ rather
> than GPL-2.0
>
>> diff --git a/drivers/spi/exynos_spi.c b/drivers/spi/exynos_spi.c
>> index c92276f..2969184 100644
>> --- a/drivers/spi/exynos_spi.c
>> +++ b/drivers/spi/exynos_spi.c
>> @@ -428,10 +428,6 @@ void spi_cs_activate(struct spi_slave *slave)
>>       clrbits_le32(&spi_slave->regs->cs_reg, SPI_SLAVE_SIG_INACT);
>>       debug("Activate CS, bus %d\n", spi_slave->slave.bus);
>>       spi_slave->skip_preamble = spi_slave->mode & SPI_PREAMBLE;
>> -
>> -     /* Remember time of this transaction so we can honour the bus delay */
>> -     if (spi_slave->bus->deactivate_delay_us)
>> -             spi_slave->last_transaction_us = timer_get_us();
>>  }
>>
>>  /**
>> @@ -445,6 +441,11 @@ void spi_cs_deactivate(struct spi_slave *slave)
>>       struct exynos_spi_slave *spi_slave = to_exynos_spi(slave);
>>
>>       setbits_le32(&spi_slave->regs->cs_reg, SPI_SLAVE_SIG_INACT);
>> +
>> +     /* Remember time of this transaction so we can honour the bus delay */
>> +     if (spi_slave->bus->deactivate_delay_us)
>> +             spi_slave->last_transaction_us = timer_get_us();
>> +
>>       debug("Deactivate CS, bus %d\n", spi_slave->slave.bus);
>>  }
>
> Is this really a related change, or shoudl that go into a separate
> commit?
>
>> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
>> index 7ddea9b..7d81fbd 100644
>> --- a/drivers/spi/spi.c
>> +++ b/drivers/spi/spi.c
>> @@ -53,6 +53,8 @@ struct spi_slave *spi_base_setup_slave_fdt(const void *blob, int busnum,
>>               mode |= SPI_CPHA;
>>       if (fdtdec_get_bool(blob, node, "spi-cs-high"))
>>               mode |= SPI_CS_HIGH;
>> +     if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
>> +             mode |= SPI_PREAMBLE;
>>       return spi_setup_slave(busnum, cs, max_hz, mode);
>
> Ditto?
>
>> diff --git a/include/configs/exynos5-dt.h b/include/configs/exynos5-dt.h
>> index e36a031..4e316b9 100644
>> --- a/include/configs/exynos5-dt.h
>> +++ b/include/configs/exynos5-dt.h
>> @@ -37,8 +37,8 @@
>>  #define CONFIG_TRACE_EARLY_ADDR              0x50000000
>>
>>  /* Keep L2 Cache Disabled */
>> -#define CONFIG_SYS_DCACHE_OFF
>>  #define CONFIG_SYS_CACHELINE_SIZE    64
>> +#define CONFIG_CMD_CACHE
>
> Ditto?
>
> Best regards,
>
> Wolfgang Denk
>
> --
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
> Politics:  A  strife  of  interests  masquerading  as  a  contest  of
> principles. The conduct of public affairs for private advantage.
> - Ambrose Bierce
> _______________________________________________
> U-Boot mailing list
> U-Boot@lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
Wolfgang Denk - June 26, 2014, 10:49 a.m.
Dear Ajay kumar,

In message <CAEC9eQNA9DkKhg9cgObaWTPrkmsn32jOrq9Uw2wgrDkedpRXAA@mail.gmail.com> you wrote:
> 
> > In message <1403769668-2026-11-git-send-email-ajaykumar.rs@samsung.com> you wrote:
> >> WIP patch to enable cros-ec on peach_pit.
> This Entire patch is a TEST_ONLY since it is still WIP(Work In Progress).
> That would mean somebody else is already working on it, but he/she hasn't sent
> that patchset yet, and till that comes up in the mailing list, this WIP patch
> can be used for testing the dependent patches.
> So, this would not be merged into the tree, but I thought its better to send
> it with a TEST_ONLY tag, so that maintainers can test this patchset.

I don't think this is an excuse for cryptic or missing description of
what this is about.

If you post something on the mailing list, then please make sure
everybody can understand it.  If the message is not intended to public
audience, then don't post it here and use some other, more private
form of communication.

Thanks.


Wolfgang Denk
Ajay kumar - June 26, 2014, 11:18 a.m.
On Thu, Jun 26, 2014 at 4:19 PM, Wolfgang Denk <wd@denx.de> wrote:
> Dear Ajay kumar,
>
> In message <CAEC9eQNA9DkKhg9cgObaWTPrkmsn32jOrq9Uw2wgrDkedpRXAA@mail.gmail.com> you wrote:
>>
>> > In message <1403769668-2026-11-git-send-email-ajaykumar.rs@samsung.com> you wrote:
>> >> WIP patch to enable cros-ec on peach_pit.
>> This Entire patch is a TEST_ONLY since it is still WIP(Work In Progress).
>> That would mean somebody else is already working on it, but he/she hasn't sent
>> that patchset yet, and till that comes up in the mailing list, this WIP patch
>> can be used for testing the dependent patches.
>> So, this would not be merged into the tree, but I thought its better to send
>> it with a TEST_ONLY tag, so that maintainers can test this patchset.
>
> I don't think this is an excuse for cryptic or missing description of
> what this is about.
>
> If you post something on the mailing list, then please make sure
> everybody can understand it.  If the message is not intended to public
> audience, then don't post it here and use some other, more private
> form of communication.
I did mention about this in the cover letter.
Still, I will make sure I elaborate more from the next time.

Thanks and regards,
Ajay Kumar

Patch

diff --git a/drivers/misc/cros_ec_spi.c b/drivers/misc/cros_ec_spi.c
index 7df709c..015333f 100644
--- a/drivers/misc/cros_ec_spi.c
+++ b/drivers/misc/cros_ec_spi.c
@@ -98,7 +98,7 @@  int cros_ec_spi_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
 	}
 
 	out = dev->dout;
-	out[0] = cmd_version;
+	out[0] = EC_CMD_VERSION0 + cmd_version;
 	out[1] = cmd;
 	out[2] = (uint8_t)dout_len;
 	memcpy(out + 3, dout, dout_len);
@@ -165,7 +165,7 @@  int cros_ec_spi_decode_fdt(struct cros_ec_dev *dev, const void *blob)
  */
 int cros_ec_spi_init(struct cros_ec_dev *dev, const void *blob)
 {
-	dev->spi = spi_setup_slave_fdt(blob, dev->parent_node, dev->node);
+	dev->spi = spi_setup_slave_fdt(blob, dev->node, dev->parent_node);
 	if (!dev->spi) {
 		debug("%s: Could not setup SPI slave\n", __func__);
 		return -1;
diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index a472f61..e7b07eb 100644
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -11,7 +11,8 @@  obj-$(CONFIG_POWER_MAX8997) += pmic_max8997.o
 obj-$(CONFIG_POWER_MUIC_MAX8997) += muic_max8997.o
 obj-$(CONFIG_POWER_MAX77686) += pmic_max77686.o
 obj-$(CONFIG_POWER_PFUZE100) += pmic_pfuze100.o
-obj-$(CONFIG_POWER_TPS65090) += pmic_tps65090.o
+obj-$(CONFIG_POWER_TPS65090_I2C) += pmic_tps65090.o
+obj-$(CONFIG_POWER_TPS65090_EC) += pmic_tps65090_ec.o
 obj-$(CONFIG_POWER_TPS65217) += pmic_tps65217.o
 obj-$(CONFIG_POWER_TPS65218) += pmic_tps65218.o
 obj-$(CONFIG_POWER_TPS65910) += pmic_tps65910.o
diff --git a/drivers/power/pmic/pmic_tps65090_ec.c b/drivers/power/pmic/pmic_tps65090_ec.c
new file mode 100644
index 0000000..93b7923
--- /dev/null
+++ b/drivers/power/pmic/pmic_tps65090_ec.c
@@ -0,0 +1,212 @@ 
+/*
+ * Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ */
+
+#include <common.h>
+#include <cros_ec.h>
+#include <errno.h>
+#include <power/tps65090_pmic.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define TPS65090_ADDR		0x48
+
+static struct tps65090 {
+	struct cros_ec_dev *dev;		/* The CROS_EC device */
+} config;
+
+/* TPS65090 register addresses */
+enum {
+	REG_FET1_CTRL = 0x0f,
+	REG_FET2_CTRL,
+	REG_FET3_CTRL,
+	REG_FET4_CTRL,
+	REG_FET5_CTRL,
+	REG_FET6_CTRL,
+	REG_FET7_CTRL,
+	TPS65090_NUM_REGS,
+};
+
+enum {
+	MAX_FET_NUM	= 7,
+	MAX_CTRL_READ_TRIES = 5,
+
+	/* TPS65090 FET_CTRL register values */
+	FET_CTRL_TOFET		= 1 << 7,  /* Timeout, startup, overload */
+	FET_CTRL_PGFET		= 1 << 4,  /* Power good for FET status */
+	FET_CTRL_WAIT		= 3 << 2,  /* Overcurrent timeout max */
+	FET_CTRL_ADENFET	= 1 << 1,  /* Enable output auto discharge */
+	FET_CTRL_ENFET		= 1 << 0,  /* Enable FET */
+};
+
+/**
+ * tps65090_read - read a byte from tps6090
+ *
+ * @param reg		The register address to read from.
+ * @param val		We'll return value value read here.
+ * @return 0 if ok; error if EC returns failure.
+ */
+static int tps65090_read(u32 reg, u8 *val)
+{
+	return cros_ec_i2c_xfer(config.dev, TPS65090_ADDR, reg, 1,
+				val, 1, true);
+}
+
+/**
+ * tps65090_write - write a byte to tps6090
+ *
+ * @param reg		The register address to write to.
+ * @param val		The value to write.
+ * @return 0 if ok; error if EC returns failure.
+ */
+static int tps65090_write(u32 reg, u8 val)
+{
+	return cros_ec_i2c_xfer(config.dev, TPS65090_ADDR, reg, 1,
+				&val, 1, false);
+}
+
+/**
+ * Checks for a valid FET number
+ *
+ * @param fet_id	FET number to check
+ * @return 0 if ok, -1 if FET value is out of range
+ */
+static int tps65090_check_fet(unsigned int fet_id)
+{
+	if (fet_id == 0 || fet_id > MAX_FET_NUM) {
+		debug("parameter fet_id is out of range, %u not in 1 ~ %u\n",
+		      fet_id, MAX_FET_NUM);
+		return -1;
+	}
+
+	return 0;
+}
+
+/**
+ * Set the power state for a FET
+ *
+ * @param fet_id	Fet number to set (1..MAX_FET_NUM)
+ * @param set		1 to power on FET, 0 to power off
+ * @return FET_ERR_COMMS if we got a comms error, FET_ERR_NOT_READY if the
+ * FET failed to change state. If all is ok, returns 0.
+ */
+static int tps65090_fet_set(int fet_id, int set)
+{
+	int retry;
+	u8 reg = 0, value;
+
+	value = FET_CTRL_ADENFET | FET_CTRL_WAIT;
+	if (set)
+		value |= FET_CTRL_ENFET;
+
+	if (tps65090_write(REG_FET1_CTRL + fet_id - 1, value))
+		return FET_ERR_COMMS;
+	/* Try reading until we get a result */
+	for (retry = 0; retry < MAX_CTRL_READ_TRIES; retry++) {
+		if (tps65090_read(REG_FET1_CTRL + fet_id - 1, &reg))
+			return FET_ERR_COMMS;
+
+		/* Check that the fet went into the expected state */
+		if (!!(reg & FET_CTRL_PGFET) == set)
+			return 0;
+
+		/* If we got a timeout, there is no point in waiting longer */
+		if (reg & FET_CTRL_TOFET)
+			break;
+
+		mdelay(1);
+	}
+
+	debug("FET %d: Power good should have set to %d but reg=%#02x\n",
+	      fet_id, set, reg);
+	return FET_ERR_NOT_READY;
+}
+
+int tps65090_fet_enable(unsigned int fet_id)
+{
+	int loops;
+	ulong start;
+	int ret = 0;
+
+	if (tps65090_check_fet(fet_id))
+		return -1;
+
+	start = get_timer(0);
+	for (loops = 0; ; loops++) {
+		ret = tps65090_fet_set(fet_id, 1);
+		if (!ret)
+			break;
+
+		if (get_timer(start) > 100)
+			break;
+
+		/* Turn it off and try again until we time out */
+		tps65090_fet_set(fet_id, 0);
+	}
+
+	if (ret) {
+		debug("%s: FET%d failed to power on: time=%lums, loops=%d\n",
+		      __func__, fet_id, get_timer(start), loops);
+	} else if (loops) {
+		debug("%s: FET%d powered on after %lums, loops=%d\n",
+		      __func__, fet_id, get_timer(start), loops);
+	}
+	/*
+	 * Unfortunately, there are some conditions where the power
+	 * good bit will be 0, but the fet still comes up. One such
+	 * case occurs with the lcd backlight. We'll just return 0 here
+	 * and assume that the fet will eventually come up.
+	 */
+	if (ret == FET_ERR_NOT_READY)
+		ret = 0;
+
+	return ret;
+}
+
+int tps65090_fet_disable(unsigned int fet_id)
+{
+	int ret;
+
+	if (tps65090_check_fet(fet_id))
+		return -1;
+
+	ret = tps65090_fet_set(fet_id, 0);
+
+	return ret;
+}
+
+int tps65090_fet_is_enabled(unsigned int fet_id)
+{
+	u8 reg = 0;
+	int ret;
+
+	if (tps65090_check_fet(fet_id))
+		return -1;
+	ret = tps65090_read(REG_FET1_CTRL + fet_id - 1, &reg);
+	if (ret) {
+		debug("fail to read FET%u_CTRL register over I2C", fet_id);
+		return -2;
+	}
+
+	return reg & FET_CTRL_ENFET;
+}
+
+int tps65090_init(void)
+{
+	puts("TPS65090 PMIC EC init\n");
+
+	config.dev = board_get_cros_ec_dev();
+	if (!config.dev) {
+		debug("%s: no cros_ec device: cannot init tps65090\n",
+		      __func__);
+		return -1;
+	}
+
+	return 0;
+}
diff --git a/drivers/spi/exynos_spi.c b/drivers/spi/exynos_spi.c
index c92276f..2969184 100644
--- a/drivers/spi/exynos_spi.c
+++ b/drivers/spi/exynos_spi.c
@@ -428,10 +428,6 @@  void spi_cs_activate(struct spi_slave *slave)
 	clrbits_le32(&spi_slave->regs->cs_reg, SPI_SLAVE_SIG_INACT);
 	debug("Activate CS, bus %d\n", spi_slave->slave.bus);
 	spi_slave->skip_preamble = spi_slave->mode & SPI_PREAMBLE;
-
-	/* Remember time of this transaction so we can honour the bus delay */
-	if (spi_slave->bus->deactivate_delay_us)
-		spi_slave->last_transaction_us = timer_get_us();
 }
 
 /**
@@ -445,6 +441,11 @@  void spi_cs_deactivate(struct spi_slave *slave)
 	struct exynos_spi_slave *spi_slave = to_exynos_spi(slave);
 
 	setbits_le32(&spi_slave->regs->cs_reg, SPI_SLAVE_SIG_INACT);
+
+	/* Remember time of this transaction so we can honour the bus delay */
+	if (spi_slave->bus->deactivate_delay_us)
+		spi_slave->last_transaction_us = timer_get_us();
+
 	debug("Deactivate CS, bus %d\n", spi_slave->slave.bus);
 }
 
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 7ddea9b..7d81fbd 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -53,6 +53,8 @@  struct spi_slave *spi_base_setup_slave_fdt(const void *blob, int busnum,
 		mode |= SPI_CPHA;
 	if (fdtdec_get_bool(blob, node, "spi-cs-high"))
 		mode |= SPI_CS_HIGH;
+	if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
+		mode |= SPI_PREAMBLE;
 	return spi_setup_slave(busnum, cs, max_hz, mode);
 }
 #endif
diff --git a/include/configs/exynos5-dt.h b/include/configs/exynos5-dt.h
index e36a031..4e316b9 100644
--- a/include/configs/exynos5-dt.h
+++ b/include/configs/exynos5-dt.h
@@ -37,8 +37,8 @@ 
 #define CONFIG_TRACE_EARLY_ADDR		0x50000000
 
 /* Keep L2 Cache Disabled */
-#define CONFIG_SYS_DCACHE_OFF
 #define CONFIG_SYS_CACHELINE_SIZE	64
+#define CONFIG_CMD_CACHE
 
 /* Enable ACE acceleration for SHA1 and SHA256 */
 #define CONFIG_EXYNOS_ACE_SHA
diff --git a/include/configs/peach-pit.h b/include/configs/peach-pit.h
index 88c093f..01be8a6 100644
--- a/include/configs/peach-pit.h
+++ b/include/configs/peach-pit.h
@@ -22,6 +22,8 @@ 
 #define CONFIG_SYS_PROMPT	"Peach # "
 #define CONFIG_IDENT_STRING	" for Peach"
 
+#define CONFIG_POWER_TPS65090_EC
+
 #define CONFIG_VIDEO_PARADE
 
 /* Display */
diff --git a/include/power/tps65090_pmic.h b/include/power/tps65090_pmic.h
index dcf99c9..531751d 100644
--- a/include/power/tps65090_pmic.h
+++ b/include/power/tps65090_pmic.h
@@ -18,6 +18,12 @@  enum {
 	TPS65090_ST1_STATE_MASK	= 0xf << TPS65090_ST1_STATE_SHIFT,
 };
 
+/* FET errors */
+enum {
+	FET_ERR_COMMS		= -1,	/* FET comms error */
+	FET_ERR_NOT_READY	= -2,	/* FET is not yet ready - retry */
+};
+
 /**
  * Enable FET
  *