[rtc-linux] [PATCH v4 0/2] Add support for cros-ec-rtc driver.

[rtc-linux] [PATCH v4 0/2] Add support for cros-ec-rtc driver.

[Enric Balletbo i Serra]

Dear all,

This is an attempt to revive some patches from that [1] patchset, some
of them are still under discussion but I think there is no reason to not
have the other two in this fourth version to land upstream meanwhile we
discuss about the others.

[1] https://lkml.org/lkml/2017/7/12/182

Changes since v3:
* Rebased an retested with current mainline using a Samsung Chromebook Plus
* Removed from patchset
  * 1/4 mfd: cros_ec: Get rid of cros_ec_check_features from cros_ec_dev.
  * 4/4 mfd: cros_ec: add RTC as mfd subdevice.

Changes since v2:
- Rebase on top of mainline.
- Removed patch 'mfd: cros-ec: Fix host command buffer size' from series
as was already picked.

Changes since v1:
- Removed patch 'iio: cros_ec_sensors: Fix return value to get raw and
calibbias data' from series as was already picked.
- Removed patch 'iio: cros_ec_sensors: Fix return value to get raw and
calibbias data' from series as was already picked.
- Patch 2/5: Acked-by: Jonathan Cameron <***@kernel.org>

Best regards,

 Enric

Stephen Barber (2):
  mfd: cros_ec: Introduce RTC commands and events definitions.
  rtc: cros-ec: add cros-ec-rtc driver.

 drivers/rtc/Kconfig                  |  10 +
 drivers/rtc/Makefile                 |   1 +
 drivers/rtc/rtc-cros-ec.c            | 413 +++++++++++++++++++++++++++++++++++
 include/linux/mfd/cros_ec_commands.h |   8 +
 4 files changed, 432 insertions(+)
 create mode 100644 drivers/rtc/rtc-cros-ec.c

-- 
2.9.3

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[rtc-linux] [PATCH v4 1/2] mfd: cros_ec: Introduce RTC commands and events definitions.

[Enric Balletbo i Serra]

From: Stephen Barber <smbarber@chromium.org>

The EC can function as a simple RT, this patch adds the RTC related
definitions needed by the rtc-cros-ec driver.

Signed-off-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Benson Leung <bleung@chromium.org>
---
 include/linux/mfd/cros_ec_commands.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
index 2b16e95..c6046a2 100644
--- a/include/linux/mfd/cros_ec_commands.h
+++ b/include/linux/mfd/cros_ec_commands.h
@@ -291,6 +291,9 @@ enum host_event_code {
 	/* EC desires to change state of host-controlled USB mux */
 	EC_HOST_EVENT_USB_MUX = 28,
 
+	/* EC RTC event occurred */
+	EC_HOST_EVENT_RTC = 26,
+
 	/*
 	 * The high bit of the event mask is not used as a host event code.  If
 	 * it reads back as set, then the entire event mask should be
@@ -799,6 +802,8 @@ enum ec_feature_code {
 	EC_FEATURE_USB_MUX = 23,
 	/* Motion Sensor code has an internal software FIFO */
 	EC_FEATURE_MOTION_SENSE_FIFO = 24,
+	/* EC has RTC feature that can be controlled by host commands */
+	EC_FEATURE_RTC = 27,
 };
 
 #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
@@ -1709,6 +1714,9 @@ struct ec_response_rtc {
 #define EC_CMD_RTC_SET_VALUE 0x46
 #define EC_CMD_RTC_SET_ALARM 0x47
 
+/* Pass as param to SET_ALARM to clear the current alarm */
+#define EC_RTC_ALARM_CLEAR 0
+
 /*****************************************************************************/
 /* Port80 log access */
 
-- 
2.9.3

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[rtc-linux] Re: [PATCH v4 1/2] mfd: cros_ec: Introduce RTC commands and events definitions.

[Brian Norris]

Hi,

On Fri, Nov 10, 2017 at 10:55:52PM +0100, Enric Balletbo i Serra wrote:
> From: Stephen Barber <smbarber@chromium.org>
> 
> The EC can function as a simple RT, this patch adds the RTC related
> definitions needed by the rtc-cros-ec driver.
> 
> Signed-off-by: Stephen Barber <smbarber@chromium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> Acked-by: Lee Jones <lee.jones@linaro.org>
> Acked-by: Benson Leung <bleung@chromium.org>

Reviewed-by: Brian Norris <briannorris@chromium.org>

I guess this is waiting to get merged by an RTC maintainer, since it's a
dependency for the RTC driver in patch 2? Alessandro or Alexandre, any
thoughts?

Brian

> ---
>  include/linux/mfd/cros_ec_commands.h | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
> index 2b16e95..c6046a2 100644
> --- a/include/linux/mfd/cros_ec_commands.h
> +++ b/include/linux/mfd/cros_ec_commands.h
> @@ -291,6 +291,9 @@ enum host_event_code {
>  	/* EC desires to change state of host-controlled USB mux */
>  	EC_HOST_EVENT_USB_MUX = 28,
>  
> +	/* EC RTC event occurred */
> +	EC_HOST_EVENT_RTC = 26,
> +
>  	/*
>  	 * The high bit of the event mask is not used as a host event code.  If
>  	 * it reads back as set, then the entire event mask should be
> @@ -799,6 +802,8 @@ enum ec_feature_code {
>  	EC_FEATURE_USB_MUX = 23,
>  	/* Motion Sensor code has an internal software FIFO */
>  	EC_FEATURE_MOTION_SENSE_FIFO = 24,
> +	/* EC has RTC feature that can be controlled by host commands */
> +	EC_FEATURE_RTC = 27,
>  };
>  
>  #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
> @@ -1709,6 +1714,9 @@ struct ec_response_rtc {
>  #define EC_CMD_RTC_SET_VALUE 0x46
>  #define EC_CMD_RTC_SET_ALARM 0x47
>  
> +/* Pass as param to SET_ALARM to clear the current alarm */
> +#define EC_RTC_ALARM_CLEAR 0
> +
>  /*****************************************************************************/
>  /* Port80 log access */
>  

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[rtc-linux] Re: [PATCH v4 1/2] mfd: cros_ec: Introduce RTC commands and events definitions.

[Enric Balletbo Serra]

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Brian,

El dia 16 des. 2017 05:58, "Brian Norris" <briannorris@chromium.org> va
escriure:

Hi,

On Fri, Nov 10, 2017 at 10:55:52PM +0100, Enric Balletbo i Serra wrote:
> From: Stephen Barber <smbarber@chromium.org>
>
> The EC can function as a simple RT, this patch adds the RTC related
> definitions needed by the rtc-cros-ec driver.
>
> Signed-off-by: Stephen Barber <smbarber@chromium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> Acked-by: Lee Jones <lee.jones@linaro.org>
> Acked-by: Benson Leung <bleung@chromium.org>

Reviewed-by: Brian Norris <briannorris@chromium.org>

I guess this is waiting to get merged by an RTC maintainer, since it's a
dependency for the RTC driver in patch 2? Alessandro or Alexandre, any
thoughts?


Guess you missed the discussion in the cover letter of this patchset ;)
These patches has been accepted and merged soon for 4.16. Alexandre will do
it.

Thanks,
  Enric


Brian

> ---
>  include/linux/mfd/cros_ec_commands.h | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/include/linux/mfd/cros_ec_commands.h
b/include/linux/mfd/cros_ec_commands.h
> index 2b16e95..c6046a2 100644
> --- a/include/linux/mfd/cros_ec_commands.h
> +++ b/include/linux/mfd/cros_ec_commands.h
> @@ -291,6 +291,9 @@ enum host_event_code {
>       /* EC desires to change state of host-controlled USB mux */
>       EC_HOST_EVENT_USB_MUX = 28,
>
> +     /* EC RTC event occurred */
> +     EC_HOST_EVENT_RTC = 26,
> +
>       /*
>        * The high bit of the event mask is not used as a host event
code.  If
>        * it reads back as set, then the entire event mask should be
> @@ -799,6 +802,8 @@ enum ec_feature_code {
>       EC_FEATURE_USB_MUX = 23,
>       /* Motion Sensor code has an internal software FIFO */
>       EC_FEATURE_MOTION_SENSE_FIFO = 24,
> +     /* EC has RTC feature that can be controlled by host commands */
> +     EC_FEATURE_RTC = 27,
>  };
>
>  #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
> @@ -1709,6 +1714,9 @@ struct ec_response_rtc {
>  #define EC_CMD_RTC_SET_VALUE 0x46
>  #define EC_CMD_RTC_SET_ALARM 0x47
>
> +/* Pass as param to SET_ALARM to clear the current alarm */
> +#define EC_RTC_ALARM_CLEAR 0
> +
>  /***********************************************************
******************/
>  /* Port80 log access */
>

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[rtc-linux] Re: [PATCH v4 1/2] mfd: cros_ec: Introduce RTC commands and events definitions.

[Brian Norris]

On Sat, Dec 16, 2017 at 08:36:23AM +0100, Enric Balletbo Serra wrote:
>    Guess you missed the discussion in the cover letter of this patchset ;)
>    These patches has been accepted and merged soon for 4.16. Alexandre
>    will do it.

I wasn't copied on either the patches or the cover letter; I just found
them through patchwork, which does not catalog cover letters. I also
didn't see the patches in -next.

Anyway, good to hear.

Brian

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[rtc-linux] [PATCH v4 2/2] rtc: cros-ec: add cros-ec-rtc driver.

[Enric Balletbo i Serra]

From: Stephen Barber <smbarber@chromium.org>

On platforms with a Chrome OS EC, the EC can function as a simple RTC.
Add a basic driver with this functionality.

Signed-off-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Benson Leung <bleung@chromium.org>
---
 drivers/rtc/Kconfig       |  10 ++
 drivers/rtc/Makefile      |   1 +
 drivers/rtc/rtc-cros-ec.c | 413 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 424 insertions(+)
 create mode 100644 drivers/rtc/rtc-cros-ec.c

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index e0e58f3..f157288 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1231,6 +1231,16 @@ config RTC_DRV_ZYNQMP
 	  If you say yes here you get support for the RTC controller found on
 	  Xilinx Zynq Ultrascale+ MPSoC.
 
+config RTC_DRV_CROS_EC
+	tristate "Chrome OS EC RTC driver"
+	depends on MFD_CROS_EC
+	help
+	  If you say yes here you will get support for the
+	  Chrome OS Embedded Controller's RTC.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-cros-ec.
+
 comment "on-CPU RTC drivers"
 
 config RTC_DRV_ASM9260
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 0bf1fc0..08789d7 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_RTC_DRV_BQ4802)	+= rtc-bq4802.o
 obj-$(CONFIG_RTC_DRV_CMOS)	+= rtc-cmos.o
 obj-$(CONFIG_RTC_DRV_COH901331)	+= rtc-coh901331.o
 obj-$(CONFIG_RTC_DRV_CPCAP)	+= rtc-cpcap.o
+obj-$(CONFIG_RTC_DRV_CROS_EC)	+= rtc-cros-ec.o
 obj-$(CONFIG_RTC_DRV_DA9052)	+= rtc-da9052.o
 obj-$(CONFIG_RTC_DRV_DA9055)	+= rtc-da9055.o
 obj-$(CONFIG_RTC_DRV_DA9063)	+= rtc-da9063.o
diff --git a/drivers/rtc/rtc-cros-ec.c b/drivers/rtc/rtc-cros-ec.c
new file mode 100644
index 0000000..f0ea689
--- /dev/null
+++ b/drivers/rtc/rtc-cros-ec.c
@@ -0,0 +1,413 @@
+/*
+ * RTC driver for Chrome OS Embedded Controller
+ *
+ * Copyright (c) 2017, Google, Inc
+ *
+ * Author: Stephen Barber <smbarber@chromium.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/mfd/cros_ec.h>
+#include <linux/mfd/cros_ec_commands.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/slab.h>
+
+#define DRV_NAME	"cros-ec-rtc"
+
+/**
+ * struct cros_ec_rtc - Driver data for EC RTC
+ *
+ * @cros_ec: Pointer to EC device
+ * @rtc: Pointer to RTC device
+ * @notifier: Notifier info for responding to EC events
+ * @saved_alarm: Alarm to restore when interrupts are reenabled
+ */
+struct cros_ec_rtc {
+	struct cros_ec_device *cros_ec;
+	struct rtc_device *rtc;
+	struct notifier_block notifier;
+	u32 saved_alarm;
+};
+
+static int cros_ec_rtc_get(struct cros_ec_device *cros_ec, u32 command,
+			   u32 *response)
+{
+	int ret;
+	struct {
+		struct cros_ec_command msg;
+		struct ec_response_rtc data;
+	} __packed msg;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.msg.command = command;
+	msg.msg.insize = sizeof(msg.data);
+
+	ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
+	if (ret < 0) {
+		dev_err(cros_ec->dev,
+			"error getting %s from EC: %d\n",
+			command == EC_CMD_RTC_GET_VALUE ? "time" : "alarm",
+			ret);
+		return ret;
+	}
+
+	*response = msg.data.time;
+
+	return 0;
+}
+
+static int cros_ec_rtc_set(struct cros_ec_device *cros_ec, u32 command,
+			   u32 param)
+{
+	int ret = 0;
+	struct {
+		struct cros_ec_command msg;
+		struct ec_response_rtc data;
+	} __packed msg;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.msg.command = command;
+	msg.msg.outsize = sizeof(msg.data);
+	msg.data.time = param;
+
+	ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
+	if (ret < 0) {
+		dev_err(cros_ec->dev, "error setting %s on EC: %d\n",
+			command == EC_CMD_RTC_SET_VALUE ? "time" : "alarm",
+			ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+/* Read the current time from the EC. */
+static int cros_ec_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+	int ret;
+	u32 time;
+
+	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &time);
+	if (ret) {
+		dev_err(dev, "error getting time: %d\n", ret);
+		return ret;
+	}
+
+	rtc_time64_to_tm(time, tm);
+
+	return 0;
+}
+
+/* Set the current EC time. */
+static int cros_ec_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+	int ret;
+	time64_t time;
+
+	time = rtc_tm_to_time64(tm);
+	if (time < 0 || time > U32_MAX)
+		return -EINVAL;
+
+	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_VALUE, (u32)time);
+	if (ret < 0) {
+		dev_err(dev, "error setting time: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+/* Read alarm time from RTC. */
+static int cros_ec_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+	int ret;
+	u32 current_time, alarm_offset;
+
+	/*
+	 * The EC host command for getting the alarm is relative (i.e. 5
+	 * seconds from now) whereas rtc_wkalrm is absolute. Get the current
+	 * RTC time first so we can calculate the relative time.
+	 */
+	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
+	if (ret < 0) {
+		dev_err(dev, "error getting time: %d\n", ret);
+		return ret;
+	}
+
+	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM, &alarm_offset);
+	if (ret < 0) {
+		dev_err(dev, "error getting alarm: %d\n", ret);
+		return ret;
+	}
+
+	rtc_time64_to_tm(current_time + alarm_offset, &alrm->time);
+
+	return 0;
+}
+
+/* Set the EC's RTC alarm. */
+static int cros_ec_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+	int ret;
+	time64_t alarm_time;
+	u32 current_time, alarm_offset;
+
+	/*
+	 * The EC host command for setting the alarm is relative
+	 * (i.e. 5 seconds from now) whereas rtc_wkalrm is absolute.
+	 * Get the current RTC time first so we can calculate the
+	 * relative time.
+	 */
+	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
+	if (ret < 0) {
+		dev_err(dev, "error getting time: %d\n", ret);
+		return ret;
+	}
+
+	alarm_time = rtc_tm_to_time64(&alrm->time);
+
+	if (alarm_time < 0 || alarm_time > U32_MAX)
+		return -EINVAL;
+
+	if (!alrm->enabled) {
+		/*
+		 * If the alarm is being disabled, send an alarm
+		 * clear command.
+		 */
+		alarm_offset = EC_RTC_ALARM_CLEAR;
+		cros_ec_rtc->saved_alarm = (u32)alarm_time;
+	} else {
+		/* Don't set an alarm in the past. */
+		if ((u32)alarm_time < current_time)
+			alarm_offset = EC_RTC_ALARM_CLEAR;
+		else
+			alarm_offset = (u32)alarm_time - current_time;
+	}
+
+	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM, alarm_offset);
+	if (ret < 0) {
+		dev_err(dev, "error setting alarm: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int cros_ec_rtc_alarm_irq_enable(struct device *dev,
+					unsigned int enabled)
+{
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+	int ret;
+	u32 current_time, alarm_offset, alarm_value;
+
+	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
+	if (ret < 0) {
+		dev_err(dev, "error getting time: %d\n", ret);
+		return ret;
+	}
+
+	if (enabled) {
+		/* Restore saved alarm if it's still in the future. */
+		if (cros_ec_rtc->saved_alarm < current_time)
+			alarm_offset = EC_RTC_ALARM_CLEAR;
+		else
+			alarm_offset = cros_ec_rtc->saved_alarm - current_time;
+
+		ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
+				      alarm_offset);
+		if (ret < 0) {
+			dev_err(dev, "error restoring alarm: %d\n", ret);
+			return ret;
+		}
+	} else {
+		/* Disable alarm, saving the old alarm value. */
+		ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM,
+				      &alarm_offset);
+		if (ret < 0) {
+			dev_err(dev, "error saving alarm: %d\n", ret);
+			return ret;
+		}
+
+		alarm_value = current_time + alarm_offset;
+
+		/*
+		 * If the current EC alarm is already past, we don't want
+		 * to set an alarm when we go through the alarm irq enable
+		 * path.
+		 */
+		if (alarm_value < current_time)
+			cros_ec_rtc->saved_alarm = EC_RTC_ALARM_CLEAR;
+		else
+			cros_ec_rtc->saved_alarm = alarm_value;
+
+		alarm_offset = EC_RTC_ALARM_CLEAR;
+		ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
+				      alarm_offset);
+		if (ret < 0) {
+			dev_err(dev, "error disabling alarm: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int cros_ec_rtc_event(struct notifier_block *nb,
+			     unsigned long queued_during_suspend,
+			     void *_notify)
+{
+	struct cros_ec_rtc *cros_ec_rtc;
+	struct rtc_device *rtc;
+	struct cros_ec_device *cros_ec;
+	u32 host_event;
+
+	cros_ec_rtc = container_of(nb, struct cros_ec_rtc, notifier);
+	rtc = cros_ec_rtc->rtc;
+	cros_ec = cros_ec_rtc->cros_ec;
+
+	host_event = cros_ec_get_host_event(cros_ec);
+	if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_RTC)) {
+		rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
+		return NOTIFY_OK;
+	} else {
+		return NOTIFY_DONE;
+	}
+}
+
+static const struct rtc_class_ops cros_ec_rtc_ops = {
+	.read_time = cros_ec_rtc_read_time,
+	.set_time = cros_ec_rtc_set_time,
+	.read_alarm = cros_ec_rtc_read_alarm,
+	.set_alarm = cros_ec_rtc_set_alarm,
+	.alarm_irq_enable = cros_ec_rtc_alarm_irq_enable,
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int cros_ec_rtc_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(cros_ec_rtc->cros_ec->irq);
+
+	return 0;
+}
+
+static int cros_ec_rtc_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(cros_ec_rtc->cros_ec->irq);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(cros_ec_rtc_pm_ops, cros_ec_rtc_suspend,
+			 cros_ec_rtc_resume);
+
+static int cros_ec_rtc_probe(struct platform_device *pdev)
+{
+	struct cros_ec_dev *ec_dev = dev_get_drvdata(pdev->dev.parent);
+	struct cros_ec_device *cros_ec = ec_dev->ec_dev;
+	struct cros_ec_rtc *cros_ec_rtc;
+	struct rtc_time tm;
+	int ret;
+
+	cros_ec_rtc = devm_kzalloc(&pdev->dev, sizeof(*cros_ec_rtc),
+				   GFP_KERNEL);
+	if (!cros_ec_rtc)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, cros_ec_rtc);
+	cros_ec_rtc->cros_ec = cros_ec;
+
+	/* Get initial time */
+	ret = cros_ec_rtc_read_time(&pdev->dev, &tm);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to read RTC time\n");
+		return ret;
+	}
+
+	ret = device_init_wakeup(&pdev->dev, 1);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to initialize wakeup\n");
+		return ret;
+	}
+
+	cros_ec_rtc->rtc = devm_rtc_device_register(&pdev->dev, DRV_NAME,
+						    &cros_ec_rtc_ops,
+						    THIS_MODULE);
+	if (IS_ERR(cros_ec_rtc->rtc)) {
+		ret = PTR_ERR(cros_ec_rtc->rtc);
+		dev_err(&pdev->dev, "failed to register rtc device\n");
+		return ret;
+	}
+
+	/* Get RTC events from the EC. */
+	cros_ec_rtc->notifier.notifier_call = cros_ec_rtc_event;
+	ret = blocking_notifier_chain_register(&cros_ec->event_notifier,
+					       &cros_ec_rtc->notifier);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register notifier\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int cros_ec_rtc_remove(struct platform_device *pdev)
+{
+	struct cros_ec_rtc *cros_ec_rtc = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	ret = blocking_notifier_chain_unregister(
+				&cros_ec_rtc->cros_ec->event_notifier,
+				&cros_ec_rtc->notifier);
+	if (ret) {
+		dev_err(dev, "failed to unregister notifier\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct platform_driver cros_ec_rtc_driver = {
+	.probe = cros_ec_rtc_probe,
+	.remove = cros_ec_rtc_remove,
+	.driver = {
+		.name = DRV_NAME,
+		.pm = &cros_ec_rtc_pm_ops,
+	},
+};
+
+module_platform_driver(cros_ec_rtc_driver);
+
+MODULE_DESCRIPTION("RTC driver for Chrome OS ECs");
+MODULE_AUTHOR("Stephen Barber <smbarber@chromium.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
-- 
2.9.3

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[rtc-linux] Re: [PATCH v4 2/2] rtc: cros-ec: add cros-ec-rtc driver.

[Brian Norris]

On Fri, Nov 10, 2017 at 10:55:53PM +0100, Enric Balletbo i Serra wrote:
> From: Stephen Barber <smbarber@chromium.org>
> 
> On platforms with a Chrome OS EC, the EC can function as a simple RTC.
> Add a basic driver with this functionality.
> 
> Signed-off-by: Stephen Barber <smbarber@chromium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> Acked-by: Benson Leung <bleung@chromium.org>
> ---
>  drivers/rtc/Kconfig       |  10 ++
>  drivers/rtc/Makefile      |   1 +
>  drivers/rtc/rtc-cros-ec.c | 413 ++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 424 insertions(+)
>  create mode 100644 drivers/rtc/rtc-cros-ec.c

This isn't quite super-helpful without the CrOS-EC / MFD additions to
actually create the device, but it's a good start, and I don't see any
problems with it. Any reason this isn't merged? Are the RTC maintainers
intendending to merge this, or should Lee (for the MFD header)? I
thought normally Lee deferred to other subsystem maintainers when the
only "MFD" stuff was a simple header change (such as in patch 1).

Anyway, FWIW:

Reviewed-by: Brian Norris <briannorris@chromium.org>
Tested-by: Brian Norris <briannorris@chromium.org>

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[rtc-linux] Re: [PATCH v4 2/2] rtc: cros-ec: add cros-ec-rtc driver.

[Brian Norris]

+ RTC maintainers

On Fri, Dec 15, 2017 at 08:57:50PM -0800, Brian Norris wrote:
> On Fri, Nov 10, 2017 at 10:55:53PM +0100, Enric Balletbo i Serra wrote:
> > From: Stephen Barber <smbarber@chromium.org>
> > 
> > On platforms with a Chrome OS EC, the EC can function as a simple RTC.
> > Add a basic driver with this functionality.
> > 
> > Signed-off-by: Stephen Barber <smbarber@chromium.org>
> > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> > Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> > Acked-by: Benson Leung <bleung@chromium.org>
> > ---
> >  drivers/rtc/Kconfig       |  10 ++
> >  drivers/rtc/Makefile      |   1 +
> >  drivers/rtc/rtc-cros-ec.c | 413 ++++++++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 424 insertions(+)
> >  create mode 100644 drivers/rtc/rtc-cros-ec.c
> 
> This isn't quite super-helpful without the CrOS-EC / MFD additions to
> actually create the device, but it's a good start, and I don't see any
> problems with it. Any reason this isn't merged? Are the RTC maintainers
> intendending to merge this, or should Lee (for the MFD header)? I
> thought normally Lee deferred to other subsystem maintainers when the
> only "MFD" stuff was a simple header change (such as in patch 1).
> 
> Anyway, FWIW:
> 
> Reviewed-by: Brian Norris <briannorris@chromium.org>
> Tested-by: Brian Norris <briannorris@chromium.org>

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[rtc-linux] Re: [PATCH v4 0/2] Add support for cros-ec-rtc driver.

[Enric Balletbo Serra]

+   Alessandro Zummo
+   Alexandre Belloni

2017-11-10 22:55 GMT+01:00 Enric Balletbo i Serra
<enric.balletbo@collabora.com>:
> Dear all,
>
> This is an attempt to revive some patches from that [1] patchset, some
> of them are still under discussion but I think there is no reason to not
> have the other two in this fourth version to land upstream meanwhile we
> discuss about the others.
>
> [1] https://lkml.org/lkml/2017/7/12/182
>
> Changes since v3:
> * Rebased an retested with current mainline using a Samsung Chromebook Plus
> * Removed from patchset
>   * 1/4 mfd: cros_ec: Get rid of cros_ec_check_features from cros_ec_dev.
>   * 4/4 mfd: cros_ec: add RTC as mfd subdevice.
>
> Changes since v2:
> - Rebase on top of mainline.
> - Removed patch 'mfd: cros-ec: Fix host command buffer size' from series
> as was already picked.
>
> Changes since v1:
> - Removed patch 'iio: cros_ec_sensors: Fix return value to get raw and
> calibbias data' from series as was already picked.
> - Removed patch 'iio: cros_ec_sensors: Fix return value to get raw and
> calibbias data' from series as was already picked.
> - Patch 2/5: Acked-by: Jonathan Cameron <***@kernel.org>
>
> Best regards,
>
>  Enric
>
> Stephen Barber (2):
>   mfd: cros_ec: Introduce RTC commands and events definitions.
>   rtc: cros-ec: add cros-ec-rtc driver.
>
>  drivers/rtc/Kconfig                  |  10 +
>  drivers/rtc/Makefile                 |   1 +
>  drivers/rtc/rtc-cros-ec.c            | 413 +++++++++++++++++++++++++++++++++++
>  include/linux/mfd/cros_ec_commands.h |   8 +
>  4 files changed, 432 insertions(+)
>  create mode 100644 drivers/rtc/rtc-cros-ec.c
>
> --
> 2.9.3
>

Sorry, I just noticed that my script to add the email recipients
failed and I did not add the RTC maintainers :( So this is a gentle
ping cc'ing the maintainers to take in consideration these patches. If
you want I resend or something else just let me know please.

Thanks,
 Enric

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[rtc-linux] Re: [PATCH v4 0/2] Add support for cros-ec-rtc driver.

[Alexandre Belloni]

On 12/12/2017 at 16:41:39 +0100, Enric Balletbo Serra wrote:
> +   Alessandro Zummo
> +   Alexandre Belloni
> 
> 2017-11-10 22:55 GMT+01:00 Enric Balletbo i Serra
> <enric.balletbo@collabora.com>:
> > Dear all,
> >
> > This is an attempt to revive some patches from that [1] patchset, some
> > of them are still under discussion but I think there is no reason to not
> > have the other two in this fourth version to land upstream meanwhile we
> > discuss about the others.
> >
> > [1] https://lkml.org/lkml/2017/7/12/182
> >
> > Changes since v3:
> > * Rebased an retested with current mainline using a Samsung Chromebook Plus
> > * Removed from patchset
> >   * 1/4 mfd: cros_ec: Get rid of cros_ec_check_features from cros_ec_dev.
> >   * 4/4 mfd: cros_ec: add RTC as mfd subdevice.
> >
> > Changes since v2:
> > - Rebase on top of mainline.
> > - Removed patch 'mfd: cros-ec: Fix host command buffer size' from series
> > as was already picked.
> >
> > Changes since v1:
> > - Removed patch 'iio: cros_ec_sensors: Fix return value to get raw and
> > calibbias data' from series as was already picked.
> > - Removed patch 'iio: cros_ec_sensors: Fix return value to get raw and
> > calibbias data' from series as was already picked.
> > - Patch 2/5: Acked-by: Jonathan Cameron <***@kernel.org>
> >
> > Best regards,
> >
> >  Enric
> >
> > Stephen Barber (2):
> >   mfd: cros_ec: Introduce RTC commands and events definitions.
> >   rtc: cros-ec: add cros-ec-rtc driver.
> >
> >  drivers/rtc/Kconfig                  |  10 +
> >  drivers/rtc/Makefile                 |   1 +
> >  drivers/rtc/rtc-cros-ec.c            | 413 +++++++++++++++++++++++++++++++++++
> >  include/linux/mfd/cros_ec_commands.h |   8 +
> >  4 files changed, 432 insertions(+)
> >  create mode 100644 drivers/rtc/rtc-cros-ec.c
> >
> > --
> > 2.9.3
> >
> 
> Sorry, I just noticed that my script to add the email recipients
> failed and I did not add the RTC maintainers :( So this is a gentle
> ping cc'ing the maintainers to take in consideration these patches. If
> you want I resend or something else just let me know please.
> 

I don't remember the specifics but I think the patches have the
necessary acks from me to go through the mfd tree (didn't we agree on
that ?)

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [rtc-linux] Re: [PATCH v4 0/2] Add support for cros-ec-rtc driver.

[Alexandre Belloni]

On 12/12/2017 at 17:05:37 +0100, Alexandre Belloni wrote:
> On 12/12/2017 at 16:41:39 +0100, Enric Balletbo Serra wrote:
> > +   Alessandro Zummo
> > +   Alexandre Belloni
> > 
> > 2017-11-10 22:55 GMT+01:00 Enric Balletbo i Serra
> > <enric.balletbo@collabora.com>:
> > > Dear all,
> > >
> > > This is an attempt to revive some patches from that [1] patchset, some
> > > of them are still under discussion but I think there is no reason to not
> > > have the other two in this fourth version to land upstream meanwhile we
> > > discuss about the others.
> > >
> > > [1] https://lkml.org/lkml/2017/7/12/182
> > >
> > > Changes since v3:
> > > * Rebased an retested with current mainline using a Samsung Chromebook Plus
> > > * Removed from patchset
> > >   * 1/4 mfd: cros_ec: Get rid of cros_ec_check_features from cros_ec_dev.
> > >   * 4/4 mfd: cros_ec: add RTC as mfd subdevice.
> > >
> > > Changes since v2:
> > > - Rebase on top of mainline.
> > > - Removed patch 'mfd: cros-ec: Fix host command buffer size' from series
> > > as was already picked.
> > >
> > > Changes since v1:
> > > - Removed patch 'iio: cros_ec_sensors: Fix return value to get raw and
> > > calibbias data' from series as was already picked.
> > > - Removed patch 'iio: cros_ec_sensors: Fix return value to get raw and
> > > calibbias data' from series as was already picked.
> > > - Patch 2/5: Acked-by: Jonathan Cameron <***@kernel.org>
> > >
> > > Best regards,
> > >
> > >  Enric
> > >
> > > Stephen Barber (2):
> > >   mfd: cros_ec: Introduce RTC commands and events definitions.
> > >   rtc: cros-ec: add cros-ec-rtc driver.
> > >
> > >  drivers/rtc/Kconfig                  |  10 +
> > >  drivers/rtc/Makefile                 |   1 +
> > >  drivers/rtc/rtc-cros-ec.c            | 413 +++++++++++++++++++++++++++++++++++
> > >  include/linux/mfd/cros_ec_commands.h |   8 +
> > >  4 files changed, 432 insertions(+)
> > >  create mode 100644 drivers/rtc/rtc-cros-ec.c
> > >
> > > --
> > > 2.9.3
> > >
> > 
> > Sorry, I just noticed that my script to add the email recipients
> > failed and I did not add the RTC maintainers :( So this is a gentle
> > ping cc'ing the maintainers to take in consideration these patches. If
> > you want I resend or something else just let me know please.
> > 
> 
> I don't remember the specifics but I think the patches have the
> necessary acks from me to go through the mfd tree (didn't we agree on
> that ?)
> 

This was the reply from Lee a while ago:

> On Wed, 18 Jan 2017, Alexandre Belloni wrote:
> > I don't think that one has your ack, is it ok for me to take it?
> 
> This set looks MFD heavy, so it's probably best that the set goes
> through MFD.  Once the RTC patch has been fixed of course.

The series doesn't look MFD heavy anymore so it can also go through my
tree. I'll let Lee decide.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [rtc-linux] Re: [PATCH v4 0/2] Add support for cros-ec-rtc driver.

[Lee Jones]

On Tue, 12 Dec 2017, Alexandre Belloni wrote:

> On 12/12/2017 at 17:05:37 +0100, Alexandre Belloni wrote:
> > On 12/12/2017 at 16:41:39 +0100, Enric Balletbo Serra wrote:
> > > +   Alessandro Zummo
> > > +   Alexandre Belloni
> > >=20
> > > 2017-11-10 22:55 GMT+01:00 Enric Balletbo i Serra
> > > <enric.balletbo@collabora.com>:
> > > > Dear all,
> > > >
> > > > This is an attempt to revive some patches from that [1] patchset, s=
ome
> > > > of them are still under discussion but I think there is no reason t=
o not
> > > > have the other two in this fourth version to land upstream meanwhil=
e we
> > > > discuss about the others.
> > > >
> > > > [1] https://lkml.org/lkml/2017/7/12/182
> > > >
> > > > Changes since v3:
> > > > * Rebased an retested with current mainline using a Samsung Chromeb=
ook Plus
> > > > * Removed from patchset
> > > >   * 1/4 mfd: cros_ec: Get rid of cros_ec_check_features from cros_e=
c_dev.
> > > >   * 4/4 mfd: cros_ec: add RTC as mfd subdevice.
> > > >
> > > > Changes since v2:
> > > > - Rebase on top of mainline.
> > > > - Removed patch 'mfd: cros-ec: Fix host command buffer size' from s=
eries
> > > > as was already picked.
> > > >
> > > > Changes since v1:
> > > > - Removed patch 'iio: cros_ec_sensors: Fix return value to get raw =
and
> > > > calibbias data' from series as was already picked.
> > > > - Removed patch 'iio: cros_ec_sensors: Fix return value to get raw =
and
> > > > calibbias data' from series as was already picked.
> > > > - Patch 2/5: Acked-by: Jonathan Cameron <***@kernel.org>
> > > >
> > > > Best regards,
> > > >
> > > >  Enric
> > > >
> > > > Stephen Barber (2):
> > > >   mfd: cros_ec: Introduce RTC commands and events definitions.
> > > >   rtc: cros-ec: add cros-ec-rtc driver.
> > > >
> > > >  drivers/rtc/Kconfig                  |  10 +
> > > >  drivers/rtc/Makefile                 |   1 +
> > > >  drivers/rtc/rtc-cros-ec.c            | 413 +++++++++++++++++++++++=
++++++++++++
> > > >  include/linux/mfd/cros_ec_commands.h |   8 +
> > > >  4 files changed, 432 insertions(+)
> > > >  create mode 100644 drivers/rtc/rtc-cros-ec.c
> > > >
> > > >
> > >=20
> > > Sorry, I just noticed that my script to add the email recipients
> > > failed and I did not add the RTC maintainers :( So this is a gentle
> > > ping cc'ing the maintainers to take in consideration these patches. I=
f
> > > you want I resend or something else just let me know please.
> > >=20
> >=20
> > I don't remember the specifics but I think the patches have the
> > necessary acks from me to go through the mfd tree (didn't we agree on
> > that ?)
> >=20
>=20
> This was the reply from Lee a while ago:
>=20
> > On Wed, 18 Jan 2017, Alexandre Belloni wrote:
> > > I don't think that one has your ack, is it ok for me to take it?
> >=20
> > This set looks MFD heavy, so it's probably best that the set goes
> > through MFD.  Once the RTC patch has been fixed of course.
>=20
> The series doesn't look MFD heavy anymore so it can also go through my
> tree. I'll let Lee decide.

Fine by me.

--=20
Lee Jones
Linaro Services Technical Lead
Linaro.org =E2=94=82 Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

--=20
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---=20
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rtc-linux" group.
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Re: [rtc-linux] Re: [PATCH v4 0/2] Add support for cros-ec-rtc driver.

[Alexandre Belloni]

On 13/12/2017 at 07:55:35 +0000, Lee Jones wrote:
> On Tue, 12 Dec 2017, Alexandre Belloni wrote:
> 
> > On 12/12/2017 at 17:05:37 +0100, Alexandre Belloni wrote:
> > > On 12/12/2017 at 16:41:39 +0100, Enric Balletbo Serra wrote:
> > > > +   Alessandro Zummo
> > > > +   Alexandre Belloni
> > > > 
> > > > 2017-11-10 22:55 GMT+01:00 Enric Balletbo i Serra
> > > > <enric.balletbo@collabora.com>:
> > > > > Dear all,
> > > > >
> > > > > This is an attempt to revive some patches from that [1] patchset, some
> > > > > of them are still under discussion but I think there is no reason to not
> > > > > have the other two in this fourth version to land upstream meanwhile we
> > > > > discuss about the others.
> > > > >
> > > > > [1] https://lkml.org/lkml/2017/7/12/182
> > > > >
> > > > > Changes since v3:
> > > > > * Rebased an retested with current mainline using a Samsung Chromebook Plus
> > > > > * Removed from patchset
> > > > >   * 1/4 mfd: cros_ec: Get rid of cros_ec_check_features from cros_ec_dev.
> > > > >   * 4/4 mfd: cros_ec: add RTC as mfd subdevice.
> > > > >
> > > > > Changes since v2:
> > > > > - Rebase on top of mainline.
> > > > > - Removed patch 'mfd: cros-ec: Fix host command buffer size' from series
> > > > > as was already picked.
> > > > >
> > > > > Changes since v1:
> > > > > - Removed patch 'iio: cros_ec_sensors: Fix return value to get raw and
> > > > > calibbias data' from series as was already picked.
> > > > > - Removed patch 'iio: cros_ec_sensors: Fix return value to get raw and
> > > > > calibbias data' from series as was already picked.
> > > > > - Patch 2/5: Acked-by: Jonathan Cameron <***@kernel.org>
> > > > >
> > > > > Best regards,
> > > > >
> > > > >  Enric
> > > > >
> > > > > Stephen Barber (2):
> > > > >   mfd: cros_ec: Introduce RTC commands and events definitions.
> > > > >   rtc: cros-ec: add cros-ec-rtc driver.
> > > > >
> > > > >  drivers/rtc/Kconfig                  |  10 +
> > > > >  drivers/rtc/Makefile                 |   1 +
> > > > >  drivers/rtc/rtc-cros-ec.c            | 413 +++++++++++++++++++++++++++++++++++
> > > > >  include/linux/mfd/cros_ec_commands.h |   8 +
> > > > >  4 files changed, 432 insertions(+)
> > > > >  create mode 100644 drivers/rtc/rtc-cros-ec.c
> > > > >
> > > > >
> > > > 
> > > > Sorry, I just noticed that my script to add the email recipients
> > > > failed and I did not add the RTC maintainers :( So this is a gentle
> > > > ping cc'ing the maintainers to take in consideration these patches. If
> > > > you want I resend or something else just let me know please.
> > > > 
> > > 
> > > I don't remember the specifics but I think the patches have the
> > > necessary acks from me to go through the mfd tree (didn't we agree on
> > > that ?)
> > > 
> > 
> > This was the reply from Lee a while ago:
> > 
> > > On Wed, 18 Jan 2017, Alexandre Belloni wrote:
> > > > I don't think that one has your ack, is it ok for me to take it?
> > > 
> > > This set looks MFD heavy, so it's probably best that the set goes
> > > through MFD.  Once the RTC patch has been fixed of course.
> > 
> > The series doesn't look MFD heavy anymore so it can also go through my
> > tree. I'll let Lee decide.
> 
> Fine by me.
> 

Applied and pushed now.

Lee, if you need a immutable branch at some point, I can create one.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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