[PATCH v3 0/6] Add rtc support for rn5t618 mfd

[PATCH v3 0/6] Add rtc support for rn5t618 mfd

[Andreas Kemnade]

In the variant rc5t619 the mfd has a rtc. This patchset adds
support for it. To do so it adds the missing register defines in 
rn5t618.h and general irq handling for that.
Probably the irq definitions are the same except missing rtc + charger
but due to missing information about that I do not add them.
There might be some oddity about the charger irq which should be 
researched when adding the charger subdevice.

The rtc driver itself is based on 
https://github.com/kobolabs/Kobo-Reader/blob/master/hw/imx6sll-clara/kernel.tar.bz2
but heavily reworked.

It was tested on the Kobo Clara HD.

Changes in v3:
- alignment cleanup
- output cleanup, remove useless toggling of alarm flag in rtc probe
- updated bindings description, so patch 1/5 becomes 2/6 and so on

Changes in v2:
- no dead code in irq code
- various improvements and cleanups in rtc driver itself

Andreas Kemnade (6):
  dt-bindings: mfd: rn5t618: Document optional property interrupts
  mfd: rn5t618: prepare for irq handling
  mfd: rn5t618: add irq support
  mfd: rn5t618: add rtc related registers
  mfd: rn5t618: add more subdevices
  rtc: rtc-rc5t619: add ricoh rc5t619 RTC driver

 .../devicetree/bindings/mfd/rn5t618.txt       |   3 +
 drivers/mfd/Kconfig                           |   1 +
 drivers/mfd/Makefile                          |   2 +
 drivers/mfd/{rn5t618.c => rn5t618-core.c}     |  52 +-
 drivers/mfd/rn5t618-irq.c                     |  85 ++++
 drivers/rtc/Kconfig                           |  10 +
 drivers/rtc/Makefile                          |   1 +
 drivers/rtc/rtc-rc5t619.c                     | 462 ++++++++++++++++++
 include/linux/mfd/rn5t618.h                   |  27 +
 9 files changed, 640 insertions(+), 3 deletions(-)
 rename drivers/mfd/{rn5t618.c => rn5t618-core.c} (78%)
 create mode 100644 drivers/mfd/rn5t618-irq.c
 create mode 100644 drivers/rtc/rtc-rc5t619.c

-- 
2.20.1

[PATCH v3 1/6] dt-bindings: mfd: rn5t618: Document optional property interrupts

[Andreas Kemnade]

These chips use interrupts for various things like rtc alarm.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
 Documentation/devicetree/bindings/mfd/rn5t618.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/rn5t618.txt b/Documentation/devicetree/bindings/mfd/rn5t618.txt
index b74e5e94d1cb..05650e1ab28a 100644
--- a/Documentation/devicetree/bindings/mfd/rn5t618.txt
+++ b/Documentation/devicetree/bindings/mfd/rn5t618.txt
@@ -15,6 +15,7 @@ Required properties:
  - reg: the I2C slave address of the device
 
 Optional properties:
+ - interrupts: interrupt mapping for IRQ
  - system-power-controller:
    See Documentation/devicetree/bindings/power/power-controller.txt
 
@@ -32,6 +33,8 @@ Example:
 	pmic@32 {
 		compatible = "ricoh,rn5t618";
 		reg = <0x32>;
+		interrupt-parent = <&gpio5>;
+		interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
 		system-power-controller;
 
 		regulators {
-- 
2.20.1

[PATCH v3 2/6] mfd: rn5t618: prepare for irq handling

[Andreas Kemnade]

rn5t618 currently lacks irq handling. To prepare implementation
in a rn5t618-irq.c, move main file to rn5t618-core.c

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
 drivers/mfd/Makefile                      | 2 ++
 drivers/mfd/{rn5t618.c => rn5t618-core.c} | 0
 2 files changed, 2 insertions(+)
 rename drivers/mfd/{rn5t618.c => rn5t618-core.c} (100%)

diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index c1067ea46204..110ea700231b 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -216,6 +216,8 @@ obj-$(CONFIG_MFD_PALMAS)	+= palmas.o
 obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o
 obj-$(CONFIG_MFD_RC5T583)	+= rc5t583.o rc5t583-irq.o
 obj-$(CONFIG_MFD_RK808)		+= rk808.o
+
+rn5t618-objs			:= rn5t618-core.o
 obj-$(CONFIG_MFD_RN5T618)	+= rn5t618.o
 obj-$(CONFIG_MFD_SEC_CORE)	+= sec-core.o sec-irq.o
 obj-$(CONFIG_MFD_SYSCON)	+= syscon.o
diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618-core.c
similarity index 100%
rename from drivers/mfd/rn5t618.c
rename to drivers/mfd/rn5t618-core.c
-- 
2.20.1

[PATCH v3 3/6] mfd: rn5t618: add irq support

[Andreas Kemnade]

This adds support for irq handling in the rc5t619 which is required
for properly implementing subdevices like rtc.
For now only definitions for the variant rc5t619 are included.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
Changes in v3:
alignment cleanup

Changes in v2:
- no dead code, did some more testing and thinking for that
- remove extra empty lines

 drivers/mfd/Kconfig         |  1 +
 drivers/mfd/Makefile        |  2 +-
 drivers/mfd/rn5t618-core.c  | 34 ++++++++++++++-
 drivers/mfd/rn5t618-irq.c   | 85 +++++++++++++++++++++++++++++++++++++
 include/linux/mfd/rn5t618.h | 16 +++++++
 5 files changed, 136 insertions(+), 2 deletions(-)
 create mode 100644 drivers/mfd/rn5t618-irq.c

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index ae24d3ea68ea..522e068d0082 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1057,6 +1057,7 @@ config MFD_RN5T618
 	depends on OF
 	select MFD_CORE
 	select REGMAP_I2C
+	select REGMAP_IRQ
 	help
 	  Say yes here to add support for the Ricoh RN5T567,
 	  RN5T618, RC5T619 PMIC.
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 110ea700231b..2906d5db67d0 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -217,7 +217,7 @@ obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o
 obj-$(CONFIG_MFD_RC5T583)	+= rc5t583.o rc5t583-irq.o
 obj-$(CONFIG_MFD_RK808)		+= rk808.o
 
-rn5t618-objs			:= rn5t618-core.o
+rn5t618-objs			:= rn5t618-core.o rn5t618-irq.o
 obj-$(CONFIG_MFD_RN5T618)	+= rn5t618.o
 obj-$(CONFIG_MFD_SEC_CORE)	+= sec-core.o sec-irq.o
 obj-$(CONFIG_MFD_SYSCON)	+= syscon.o
diff --git a/drivers/mfd/rn5t618-core.c b/drivers/mfd/rn5t618-core.c
index da5cd9c92a59..1e2326217681 100644
--- a/drivers/mfd/rn5t618-core.c
+++ b/drivers/mfd/rn5t618-core.c
@@ -8,6 +8,7 @@
 
 #include <linux/delay.h>
 #include <linux/i2c.h>
+#include <linux/interrupt.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/rn5t618.h>
 #include <linux/module.h>
@@ -105,7 +106,8 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
 
 	i2c_set_clientdata(i2c, priv);
 	priv->variant = (long)of_id->data;
-
+	priv->chip_irq = i2c->irq;
+	priv->dev = &i2c->dev;
 	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
 	if (IS_ERR(priv->regmap)) {
 		ret = PTR_ERR(priv->regmap);
@@ -137,6 +139,11 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
+	if (priv->chip_irq > 0) {
+		if (rn5t618_irq_init(priv))
+			priv->chip_irq = 0;
+	}
+
 	return 0;
 }
 
@@ -154,15 +161,40 @@ static int rn5t618_i2c_remove(struct i2c_client *i2c)
 	return 0;
 }
 
+static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
+{
+	struct rn5t618 *priv = dev_get_drvdata(dev);
+
+	if (priv->chip_irq)
+		disable_irq(priv->chip_irq);
+
+	return 0;
+}
+
+static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
+{
+	struct rn5t618 *priv = dev_get_drvdata(dev);
+
+	if (priv->chip_irq)
+		enable_irq(priv->chip_irq);
+
+	return 0;
+}
+
 static const struct i2c_device_id rn5t618_i2c_id[] = {
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
 
+static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
+			rn5t618_i2c_suspend,
+			rn5t618_i2c_resume);
+
 static struct i2c_driver rn5t618_i2c_driver = {
 	.driver = {
 		.name = "rn5t618",
 		.of_match_table = of_match_ptr(rn5t618_of_match),
+		.pm = &rn5t618_i2c_dev_pm_ops,
 	},
 	.probe = rn5t618_i2c_probe,
 	.remove = rn5t618_i2c_remove,
diff --git a/drivers/mfd/rn5t618-irq.c b/drivers/mfd/rn5t618-irq.c
new file mode 100644
index 000000000000..8a4c56429768
--- /dev/null
+++ b/drivers/mfd/rn5t618-irq.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 Andreas Kemnade
+ */
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/rn5t618.h>
+
+static const struct regmap_irq rc5t619_irqs[] = {
+	[RN5T618_IRQ_SYS] = {
+		.reg_offset = 0,
+		.mask = (0 << 1)
+	},
+	[RN5T618_IRQ_DCDC] = {
+		.reg_offset = 0,
+		.mask = (1 << 1)
+	},
+	[RN5T618_IRQ_RTC]  = {
+		.reg_offset = 0,
+		.mask = (1 << 2)
+	},
+	[RN5T618_IRQ_ADC] = {
+		.reg_offset = 0,
+		.mask = (1 << 3)
+	},
+	[RN5T618_IRQ_GPIO] = {
+		.reg_offset = 0,
+		.mask = (1 << 4)
+	},
+	[RN5T618_IRQ_CHG] = {
+		.reg_offset = 0,
+		.mask = (1 << 6),
+	}
+};
+
+static const struct regmap_irq_chip rc5t619_irq_chip = {
+	.name = "rc5t619",
+	.irqs = rc5t619_irqs,
+	.num_irqs = ARRAY_SIZE(rc5t619_irqs),
+	.num_regs = 1,
+	.status_base = RN5T618_INTMON,
+	.mask_base = RN5T618_INTEN,
+	.mask_invert = true,
+};
+
+int rn5t618_irq_init(struct rn5t618 *rn5t618)
+{
+	const struct regmap_irq_chip *irq_chip;
+	int ret;
+
+	if (!rn5t618->chip_irq)
+		return 0;
+
+	switch (rn5t618->variant) {
+	case RC5T619:
+		irq_chip = &rc5t619_irq_chip;
+		break;
+
+		/* TODO: check irq definitions for other variants */
+
+	default:
+		irq_chip = NULL;
+		break;
+	}
+
+	if (!irq_chip) {
+		dev_err(rn5t618->dev, "no IRQ definition known for variant\n");
+		return -ENOENT;
+	}
+
+	ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
+				       rn5t618->chip_irq,
+				       IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+				       0, irq_chip, &rn5t618->irq_data);
+	if (ret != 0) {
+		dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
+		return ret;
+	}
+
+	return 0;
+}
diff --git a/include/linux/mfd/rn5t618.h b/include/linux/mfd/rn5t618.h
index d62ef48060b5..edd2b6485e3b 100644
--- a/include/linux/mfd/rn5t618.h
+++ b/include/linux/mfd/rn5t618.h
@@ -242,9 +242,25 @@ enum {
 	RC5T619,
 };
 
+/* RN5T618 IRQ definitions */
+enum {
+	RN5T618_IRQ_SYS,
+	RN5T618_IRQ_DCDC,
+	RN5T618_IRQ_RTC,
+	RN5T618_IRQ_ADC,
+	RN5T618_IRQ_GPIO,
+	RN5T618_IRQ_CHG,
+	RN5T618_NR_IRQS,
+};
+
 struct rn5t618 {
 	struct regmap *regmap;
+	struct device *dev;
 	long variant;
+
+	int chip_irq;
+	struct regmap_irq_chip_data *irq_data;
 };
 
+extern int rn5t618_irq_init(struct rn5t618 *rn5t618);
 #endif /* __LINUX_MFD_RN5T618_H */
-- 
2.20.1

[PATCH v3 4/6] mfd: rn5t618: add rtc related registers

[Andreas Kemnade]

Defines for some rtc related registers were missing, also
they were not included in the volatile register list

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
 drivers/mfd/rn5t618-core.c  |  2 ++
 include/linux/mfd/rn5t618.h | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/mfd/rn5t618-core.c b/drivers/mfd/rn5t618-core.c
index 1e2326217681..fe56c5a50563 100644
--- a/drivers/mfd/rn5t618-core.c
+++ b/drivers/mfd/rn5t618-core.c
@@ -32,6 +32,8 @@ static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
 	case RN5T618_IR_GPF:
 	case RN5T618_MON_IOIN:
 	case RN5T618_INTMON:
+	case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2:
+	case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR:
 		return true;
 	default:
 		return false;
diff --git a/include/linux/mfd/rn5t618.h b/include/linux/mfd/rn5t618.h
index edd2b6485e3b..26c36b58916c 100644
--- a/include/linux/mfd/rn5t618.h
+++ b/include/linux/mfd/rn5t618.h
@@ -139,6 +139,17 @@
 #define RN5T618_INTPOL			0x9c
 #define RN5T618_INTEN			0x9d
 #define RN5T618_INTMON			0x9e
+
+#define RN5T618_RTC_SECONDS     0xA0
+#define RN5T618_RTC_MDAY        0xA4
+#define RN5T618_RTC_MONTH       0xA5
+#define RN5T618_RTC_YEAR        0xA6
+#define RN5T618_RTC_ADJUST      0xA7
+#define RN5T618_RTC_ALARM_Y_SEC 0xA8
+#define RN5T618_RTC_DAL_MONTH   0xAC
+#define RN5T618_RTC_CTRL1       0xAE
+#define RN5T618_RTC_CTRL2       0xAF
+
 #define RN5T618_PREVINDAC		0xb0
 #define RN5T618_BATDAC			0xb1
 #define RN5T618_CHGCTL1			0xb3
-- 
2.20.1

[PATCH v3 5/6] mfd: rn5t618: add more subdevices

[Andreas Kemnade]

The rc5t619 has a rtc which is missing in the
rn5t618. Add it as subdevice to prepare for their implementation

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
Changes in v3:
- alignment cleanup
 drivers/mfd/rn5t618-core.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/rn5t618-core.c b/drivers/mfd/rn5t618-core.c
index fe56c5a50563..d3f137796cab 100644
--- a/drivers/mfd/rn5t618-core.c
+++ b/drivers/mfd/rn5t618-core.c
@@ -21,6 +21,12 @@ static const struct mfd_cell rn5t618_cells[] = {
 	{ .name = "rn5t618-wdt" },
 };
 
+static const struct mfd_cell rc5t619_cells[] = {
+	{ .name = "rn5t618-regulator" },
+	{ .name = "rc5t619-rtc" },
+	{ .name = "rn5t618-wdt" },
+};
+
 static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
@@ -117,8 +123,14 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
-	ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
-				   ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
+	if (priv->variant == RC5T619)
+		ret = devm_mfd_add_devices(&i2c->dev, -1, rc5t619_cells,
+					   ARRAY_SIZE(rc5t619_cells),
+					   NULL, 0, NULL);
+	else
+		ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
+					   ARRAY_SIZE(rn5t618_cells),
+					   NULL, 0, NULL);
 	if (ret) {
 		dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
 		return ret;
-- 
2.20.1

[PATCH v3 6/6] rtc: rtc-rc5t619: add ricoh rc5t619 RTC driver

[Andreas Kemnade]

Add an RTC driver for the RTC device on Ricoh MFD rc5t619,
which is implemented as a variant of rn5t618.

rtc-range output:
Testing 2000-02-28 23:59:59.
OK

Testing 2038-01-19 03:14:07.
OK

Testing 2069-12-31 23:59:59.
OK

Testing 2099-12-31 23:59:59.
KO RTC_RD_TIME returned 22 (line 138)

Testing 2100-02-28 23:59:59.
KO RTC_SET_TIME returned 34 (line 122)

Testing 2106-02-07 06:28:15.
KO RTC_SET_TIME returned 34 (line 122)

Testing 2262-04-11 23:47:16.
KO RTC_SET_TIME returned 34 (line 122)

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
- further output cleanup
- remove useless toggling of alarm flag in rtc probe
- alignment cleanup

Changes in v2:
- correct subject line
- reset pon flag not at probe but later
- initialize things only on pon
- 12h handling
- ranges
- style cleanup
- less magic values

 drivers/rtc/Kconfig       |  10 +
 drivers/rtc/Makefile      |   1 +
 drivers/rtc/rtc-rc5t619.c | 462 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 473 insertions(+)
 create mode 100644 drivers/rtc/rtc-rc5t619.c

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 1adf9f815652..b8e5bfa8efc6 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -600,6 +600,16 @@ config RTC_DRV_RC5T583
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-rc5t583.
 
+config RTC_DRV_RC5T619
+	tristate "RICOH RC5T619 RTC driver"
+	depends on MFD_RN5T618
+	help
+	  If you say yes here you get support for the RTC on the
+	  RICOH RC5T619 chips.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-rc5t619.
+
 config RTC_DRV_S35390A
 	tristate "Seiko Instruments S-35390A"
 	select BITREVERSE
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 4ac8f19fb631..7612912cdf00 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -137,6 +137,7 @@ obj-$(CONFIG_RTC_DRV_PXA)	+= rtc-pxa.o
 obj-$(CONFIG_RTC_DRV_R7301)	+= rtc-r7301.o
 obj-$(CONFIG_RTC_DRV_R9701)	+= rtc-r9701.o
 obj-$(CONFIG_RTC_DRV_RC5T583)	+= rtc-rc5t583.o
+obj-$(CONFIG_RTC_DRV_RC5T619)	+= rtc-rc5t619.o
 obj-$(CONFIG_RTC_DRV_RK808)	+= rtc-rk808.o
 obj-$(CONFIG_RTC_DRV_RP5C01)	+= rtc-rp5c01.o
 obj-$(CONFIG_RTC_DRV_RS5C313)	+= rtc-rs5c313.o
diff --git a/drivers/rtc/rtc-rc5t619.c b/drivers/rtc/rtc-rc5t619.c
new file mode 100644
index 000000000000..1860f3e7f6e7
--- /dev/null
+++ b/drivers/rtc/rtc-rc5t619.c
@@ -0,0 +1,462 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * drivers/rtc/rtc-rc5t619.c
+ *
+ * Real time clock driver for RICOH RC5T619 power management chip.
+ *
+ * Copyright (C) 2019 Andreas Kemnade
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mfd/rn5t618.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/bcd.h>
+#include <linux/rtc.h>
+#include <linux/slab.h>
+#include <linux/irqdomain.h>
+
+struct rc5t619_rtc {
+	int			irq;
+	struct rtc_device	*rtc;
+	struct rn5t618 *rn5t618;
+};
+
+#define CTRL1_ALARM_ENABLED 0x40
+#define CTRL1_24HR 0x20
+#define CTRL1_PERIODIC_MASK 0xf
+
+#define CTRL2_PON 0x10
+#define CTRL2_ALARM_STATUS 0x80
+#define CTRL2_CTFG 0x4
+#define CTRL2_CTC 0x1
+
+#define MONTH_CENTFLAG 0x80
+#define HOUR_PMFLAG 0x20
+#define MDAY_DAL_EXT 0x80
+
+static uint8_t rtc5t619_12hour_bcd2bin(uint8_t hour)
+{
+	if (hour & HOUR_PMFLAG) {
+		hour = bcd2bin(hour & ~HOUR_PMFLAG);
+		return hour == 12 ? 12 : 12 + hour;
+	}
+
+	hour = bcd2bin(hour);
+	return hour == 12 ? 0 : hour;
+}
+
+static uint8_t rtc5t619_12hour_bin2bcd(uint8_t hour)
+{
+	if (!hour)
+		return 0x12;
+
+	if (hour < 12)
+		return bin2bcd(hour);
+
+	if (hour == 12)
+		return 0x12 | HOUR_PMFLAG;
+
+	return bin2bcd(hour - 12) | HOUR_PMFLAG;
+}
+
+static int rc5t619_rtc_periodic_disable(struct device *dev)
+{
+	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+	int err;
+
+	/* disable function */
+	err = regmap_update_bits(rtc->rn5t618->regmap,
+				 RN5T618_RTC_CTRL1, CTRL1_PERIODIC_MASK, 0);
+	if (err < 0)
+		return err;
+
+	/* clear alarm flag and CTFG */
+	err = regmap_update_bits(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2,
+				 CTRL2_ALARM_STATUS | CTRL2_CTFG | CTRL2_CTC,
+				 0);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
+/* things to be done once after power on */
+static int rc5t619_rtc_pon_setup(struct device *dev)
+{
+	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+	int err;
+	unsigned int reg_data;
+
+	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &reg_data);
+	if (err < 0)
+		return err;
+
+	/* clear VDET PON */
+	reg_data &= ~(CTRL2_PON | CTRL2_CTC | 0x4a);	/* 0101-1011 */
+	reg_data |= 0x20;	/* 0010-0000 */
+	err = regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, reg_data);
+	if (err < 0)
+		return err;
+
+	/* clearing RTC Adjust register */
+	err = regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_ADJUST, 0);
+	if (err)
+		return err;
+
+	return regmap_update_bits(rtc->rn5t618->regmap,
+					RN5T618_RTC_CTRL1,
+					CTRL1_24HR, CTRL1_24HR);
+}
+
+static int rc5t619_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+	u8 buff[7];
+	int err;
+	int cent_flag;
+	unsigned int ctrl1;
+	unsigned int ctrl2;
+
+	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
+	if (err < 0)
+		return err;
+
+	if (ctrl2 & CTRL2_PON)
+		return -EINVAL;
+
+	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
+	if (err < 0)
+		return err;
+
+	err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS,
+			       buff, sizeof(buff));
+	if (err < 0)
+		return err;
+
+	if (buff[5] & MONTH_CENTFLAG)
+		cent_flag = 1;
+	else
+		cent_flag = 0;
+
+	tm->tm_sec  = bcd2bin(buff[0]);
+	tm->tm_min  = bcd2bin(buff[1]);
+
+	if (ctrl1 & CTRL1_24HR)
+		tm->tm_hour = bcd2bin(buff[2]);
+	else
+		tm->tm_hour = rtc5t619_12hour_bcd2bin(buff[2]);
+
+	tm->tm_wday = bcd2bin(buff[3]);
+	tm->tm_mday = bcd2bin(buff[4]);
+	tm->tm_mon  = bcd2bin(buff[5] & 0x1f) - 1; /* back to system 0-11 */
+	tm->tm_year = bcd2bin(buff[6]) + 100 * cent_flag;
+
+	return 0;
+}
+
+static int rc5t619_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+	u8 buff[7];
+	int err;
+	int cent_flag;
+	unsigned int ctrl1;
+	unsigned int ctrl2;
+
+	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
+	if (err < 0)
+		return err;
+
+	if (ctrl2 & CTRL2_PON)
+		rc5t619_rtc_pon_setup(dev);
+
+	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
+	if (err < 0)
+		return err;
+
+	if (tm->tm_year >= 100)
+		cent_flag = 1;
+	else
+		cent_flag = 0;
+
+	buff[0] = bin2bcd(tm->tm_sec);
+	buff[1] = bin2bcd(tm->tm_min);
+
+	if (ctrl1 & CTRL1_24HR)
+		buff[2] = bin2bcd(tm->tm_hour);
+	else
+		buff[2] = rtc5t619_12hour_bin2bcd(tm->tm_hour);
+
+	buff[3] = bin2bcd(tm->tm_wday);
+	buff[4] = bin2bcd(tm->tm_mday);
+	buff[5] = bin2bcd(tm->tm_mon + 1);	/* system set 0-11 */
+	buff[6] = bin2bcd(tm->tm_year - cent_flag * 100);
+
+	if (cent_flag)
+		buff[5] |= MONTH_CENTFLAG;
+
+	err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS,
+				buff, sizeof(buff));
+	if (err < 0) {
+		dev_err(dev, "failed to program new time: %d\n", err);
+		return err;
+	}
+
+	return 0;
+}
+
+static int rc5t619_rtc_alarm_is_enabled(struct device *dev,  uint8_t *enabled)
+{
+	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+	int err;
+	unsigned int reg_data;
+
+	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &reg_data);
+	if (err)
+		return err;
+
+	if (reg_data & CTRL1_ALARM_ENABLED)
+		*enabled = 1;
+	else
+		*enabled = 0;
+
+	return err;
+}
+
+/* 0-disable, 1-enable */
+static int rc5t619_rtc_alarm_enable(struct device *dev, unsigned int enabled)
+{
+	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+
+	return regmap_update_bits(rtc->rn5t618->regmap,
+			RN5T618_RTC_CTRL1,
+			CTRL1_ALARM_ENABLED,
+			enabled ? CTRL1_ALARM_ENABLED : 0);
+}
+
+static int rc5t619_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+	u8 buff[6];
+	unsigned int buff_cent;
+	int err;
+	int cent_flag;
+	unsigned int ctrl1;
+
+	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
+	if (err)
+		return err;
+
+	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_MONTH, &buff_cent);
+	if (err < 0) {
+		dev_err(dev, "failed to read time: %d\n", err);
+		return err;
+	}
+
+	if (buff_cent & MONTH_CENTFLAG)
+		cent_flag = 1;
+	else
+		cent_flag = 0;
+
+	err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC,
+			       buff, sizeof(buff));
+	if (err)
+		return err;
+
+	buff[3] = buff[3] & 0x3f;
+
+	alrm->time.tm_sec  = bcd2bin(buff[0]);
+	alrm->time.tm_min  = bcd2bin(buff[1]);
+
+	if (ctrl1 & CTRL1_24HR)
+		alrm->time.tm_hour = bcd2bin(buff[2]);
+	else
+		alrm->time.tm_hour = rtc5t619_12hour_bcd2bin(buff[2]);
+
+	alrm->time.tm_mday = bcd2bin(buff[3]);
+	alrm->time.tm_mon  = bcd2bin(buff[4]) - 1;
+	alrm->time.tm_year = bcd2bin(buff[5]) + 100 * cent_flag;
+	alrm->enabled = !!(ctrl1 & CTRL1_ALARM_ENABLED);
+	dev_dbg(dev, "read alarm: %ptR\n", &alrm->time);
+
+	return 0;
+}
+
+static int rc5t619_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+	u8 buff[6];
+	int err;
+	int cent_flag;
+	unsigned int ctrl1;
+
+	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
+	if (err)
+		return err;
+
+	err = rc5t619_rtc_alarm_enable(dev, 0);
+	if (err < 0)
+		return err;
+
+	if (rtc->irq == -1)
+		return -EINVAL;
+
+	if (alrm->enabled == 0)
+		return 0;
+
+	if (alrm->time.tm_year >= 100)
+		cent_flag = 1;
+	else
+		cent_flag = 0;
+
+	alrm->time.tm_mon += 1;
+	buff[0] = bin2bcd(alrm->time.tm_sec);
+	buff[1] = bin2bcd(alrm->time.tm_min);
+
+	if (ctrl1 & CTRL1_24HR)
+		buff[2] = bin2bcd(alrm->time.tm_hour);
+	else
+		buff[2] = rtc5t619_12hour_bin2bcd(alrm->time.tm_hour);
+
+	buff[3] = bin2bcd(alrm->time.tm_mday);
+	buff[4] = bin2bcd(alrm->time.tm_mon);
+	buff[5] = bin2bcd(alrm->time.tm_year - 100 * cent_flag);
+	buff[3] |= MDAY_DAL_EXT;
+
+	err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC,
+				buff, sizeof(buff));
+	if (err < 0)
+		return err;
+
+	return rc5t619_rtc_alarm_enable(dev, alrm->enabled);
+}
+
+static const struct rtc_class_ops rc5t619_rtc_ops = {
+	.read_time	= rc5t619_rtc_read_time,
+	.set_time	= rc5t619_rtc_set_time,
+	.set_alarm	= rc5t619_rtc_set_alarm,
+	.read_alarm	= rc5t619_rtc_read_alarm,
+	.alarm_irq_enable = rc5t619_rtc_alarm_enable,
+};
+
+static int rc5t619_rtc_alarm_flag_clr(struct device *dev)
+{
+	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+
+	/* clear alarm-D status bits.*/
+	return regmap_update_bits(rtc->rn5t618->regmap,
+				RN5T618_RTC_CTRL2,
+				CTRL2_ALARM_STATUS | CTRL2_CTC, 0);
+}
+
+static irqreturn_t rc5t619_rtc_irq(int irq, void *data)
+{
+	struct device *dev = data;
+	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
+
+	rc5t619_rtc_alarm_flag_clr(dev);
+
+	rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
+	return IRQ_HANDLED;
+}
+
+static int rc5t619_rtc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent);
+	struct rc5t619_rtc *rtc;
+	unsigned int ctrl2;
+	int err;
+
+	rtc = devm_kzalloc(dev, sizeof(*rtc), GFP_KERNEL);
+	if (IS_ERR(rtc)) {
+		err = PTR_ERR(rtc);
+		return -ENOMEM;
+	}
+
+	rtc->rn5t618 = rn5t618;
+
+	dev_set_drvdata(dev, rtc);
+	rtc->irq = -1;
+
+	if (rn5t618->irq_data)
+		rtc->irq = regmap_irq_get_virq(rn5t618->irq_data,
+					       RN5T618_IRQ_RTC);
+
+	if (rtc->irq  < 0)
+		rtc->irq = -1;
+
+	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
+	if (err < 0)
+		return err;
+
+	/* disable rtc periodic function */
+	err = rc5t619_rtc_periodic_disable(&pdev->dev);
+	if (err)
+		return err;
+
+	if (ctrl2 & CTRL2_PON) {
+		err = rc5t619_rtc_alarm_flag_clr(&pdev->dev);
+		if (err)
+			return err;
+	}
+
+	rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(rtc->rtc)) {
+		err = PTR_ERR(rtc->rtc);
+		dev_err(dev, "RTC device register: err %d\n", err);
+		return err;
+	}
+
+	rtc->rtc->ops = &rc5t619_rtc_ops;
+	rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_1900;
+	rtc->rtc->range_max = RTC_TIMESTAMP_END_2099;
+
+	/* set interrupt and enable it */
+	if (rtc->irq != -1) {
+		err = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
+						rc5t619_rtc_irq,
+						IRQF_ONESHOT,
+						"rtc-rc5t619",
+						&pdev->dev);
+		if (err < 0) {
+			dev_err(&pdev->dev, "request IRQ:%d fail\n", rtc->irq);
+			rtc->irq = -1;
+
+			err = rc5t619_rtc_alarm_enable(&pdev->dev, 0);
+			if (err)
+				return err;
+
+		} else {
+			/* enable wake */
+			device_init_wakeup(&pdev->dev, 1);
+			enable_irq_wake(rtc->irq);
+		}
+	} else {
+		/* system don't want to using alarm interrupt, so close it */
+		err = rc5t619_rtc_alarm_enable(&pdev->dev, 0);
+		if (err)
+			return err;
+
+		dev_warn(&pdev->dev, "rc5t619 interrupt is disabled\n");
+	}
+
+	return rtc_register_device(rtc->rtc);
+}
+
+static struct platform_driver rc5t619_rtc_driver = {
+	.driver	= {
+		.name	= "rc5t619-rtc",
+	},
+	.probe	= rc5t619_rtc_probe,
+};
+
+module_platform_driver(rc5t619_rtc_driver);
+MODULE_ALIAS("platform:rc5t619-rtc");
+MODULE_DESCRIPTION("RICOH RC5T619 RTC driver");
+MODULE_LICENSE("GPL");
-- 
2.20.1

Re: [PATCH v3 6/6] rtc: rtc-rc5t619: add ricoh rc5t619 RTC driver

[Alexandre Belloni]

On 29/11/2019 22:20:45+0100, Andreas Kemnade wrote:
> Add an RTC driver for the RTC device on Ricoh MFD rc5t619,
> which is implemented as a variant of rn5t618.
> 
> rtc-range output:
> Testing 2000-02-28 23:59:59.
> OK
> 
> Testing 2038-01-19 03:14:07.
> OK
> 
> Testing 2069-12-31 23:59:59.
> OK
> 
> Testing 2099-12-31 23:59:59.
> KO RTC_RD_TIME returned 22 (line 138)
> 
> Testing 2100-02-28 23:59:59.
> KO RTC_SET_TIME returned 34 (line 122)
> 
> Testing 2106-02-07 06:28:15.
> KO RTC_SET_TIME returned 34 (line 122)
> 
> Testing 2262-04-11 23:47:16.
> KO RTC_SET_TIME returned 34 (line 122)
> 
> Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

> ---
> - further output cleanup
> - remove useless toggling of alarm flag in rtc probe
> - alignment cleanup
> 
> Changes in v2:
> - correct subject line
> - reset pon flag not at probe but later
> - initialize things only on pon
> - 12h handling
> - ranges
> - style cleanup
> - less magic values
> 
>  drivers/rtc/Kconfig       |  10 +
>  drivers/rtc/Makefile      |   1 +
>  drivers/rtc/rtc-rc5t619.c | 462 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 473 insertions(+)
>  create mode 100644 drivers/rtc/rtc-rc5t619.c
> 
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index 1adf9f815652..b8e5bfa8efc6 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -600,6 +600,16 @@ config RTC_DRV_RC5T583
>  	  This driver can also be built as a module. If so, the module
>  	  will be called rtc-rc5t583.
>  
> +config RTC_DRV_RC5T619
> +	tristate "RICOH RC5T619 RTC driver"
> +	depends on MFD_RN5T618
> +	help
> +	  If you say yes here you get support for the RTC on the
> +	  RICOH RC5T619 chips.
> +
> +	  This driver can also be built as a module. If so, the module
> +	  will be called rtc-rc5t619.
> +
>  config RTC_DRV_S35390A
>  	tristate "Seiko Instruments S-35390A"
>  	select BITREVERSE
> diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
> index 4ac8f19fb631..7612912cdf00 100644
> --- a/drivers/rtc/Makefile
> +++ b/drivers/rtc/Makefile
> @@ -137,6 +137,7 @@ obj-$(CONFIG_RTC_DRV_PXA)	+= rtc-pxa.o
>  obj-$(CONFIG_RTC_DRV_R7301)	+= rtc-r7301.o
>  obj-$(CONFIG_RTC_DRV_R9701)	+= rtc-r9701.o
>  obj-$(CONFIG_RTC_DRV_RC5T583)	+= rtc-rc5t583.o
> +obj-$(CONFIG_RTC_DRV_RC5T619)	+= rtc-rc5t619.o
>  obj-$(CONFIG_RTC_DRV_RK808)	+= rtc-rk808.o
>  obj-$(CONFIG_RTC_DRV_RP5C01)	+= rtc-rp5c01.o
>  obj-$(CONFIG_RTC_DRV_RS5C313)	+= rtc-rs5c313.o
> diff --git a/drivers/rtc/rtc-rc5t619.c b/drivers/rtc/rtc-rc5t619.c
> new file mode 100644
> index 000000000000..1860f3e7f6e7
> --- /dev/null
> +++ b/drivers/rtc/rtc-rc5t619.c
> @@ -0,0 +1,462 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * drivers/rtc/rtc-rc5t619.c
> + *
> + * Real time clock driver for RICOH RC5T619 power management chip.
> + *
> + * Copyright (C) 2019 Andreas Kemnade
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/device.h>
> +#include <linux/errno.h>
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/mfd/rn5t618.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/bcd.h>
> +#include <linux/rtc.h>
> +#include <linux/slab.h>
> +#include <linux/irqdomain.h>
> +
> +struct rc5t619_rtc {
> +	int			irq;
> +	struct rtc_device	*rtc;
> +	struct rn5t618 *rn5t618;
> +};
> +
> +#define CTRL1_ALARM_ENABLED 0x40
> +#define CTRL1_24HR 0x20
> +#define CTRL1_PERIODIC_MASK 0xf
> +
> +#define CTRL2_PON 0x10
> +#define CTRL2_ALARM_STATUS 0x80
> +#define CTRL2_CTFG 0x4
> +#define CTRL2_CTC 0x1
> +
> +#define MONTH_CENTFLAG 0x80
> +#define HOUR_PMFLAG 0x20
> +#define MDAY_DAL_EXT 0x80
> +
> +static uint8_t rtc5t619_12hour_bcd2bin(uint8_t hour)
> +{
> +	if (hour & HOUR_PMFLAG) {
> +		hour = bcd2bin(hour & ~HOUR_PMFLAG);
> +		return hour == 12 ? 12 : 12 + hour;
> +	}
> +
> +	hour = bcd2bin(hour);
> +	return hour == 12 ? 0 : hour;
> +}
> +
> +static uint8_t rtc5t619_12hour_bin2bcd(uint8_t hour)
> +{
> +	if (!hour)
> +		return 0x12;
> +
> +	if (hour < 12)
> +		return bin2bcd(hour);
> +
> +	if (hour == 12)
> +		return 0x12 | HOUR_PMFLAG;
> +
> +	return bin2bcd(hour - 12) | HOUR_PMFLAG;
> +}
> +
> +static int rc5t619_rtc_periodic_disable(struct device *dev)
> +{
> +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> +	int err;
> +
> +	/* disable function */
> +	err = regmap_update_bits(rtc->rn5t618->regmap,
> +				 RN5T618_RTC_CTRL1, CTRL1_PERIODIC_MASK, 0);
> +	if (err < 0)
> +		return err;
> +
> +	/* clear alarm flag and CTFG */
> +	err = regmap_update_bits(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2,
> +				 CTRL2_ALARM_STATUS | CTRL2_CTFG | CTRL2_CTC,
> +				 0);
> +	if (err < 0)
> +		return err;
> +
> +	return 0;
> +}
> +
> +/* things to be done once after power on */
> +static int rc5t619_rtc_pon_setup(struct device *dev)
> +{
> +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> +	int err;
> +	unsigned int reg_data;
> +
> +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &reg_data);
> +	if (err < 0)
> +		return err;
> +
> +	/* clear VDET PON */
> +	reg_data &= ~(CTRL2_PON | CTRL2_CTC | 0x4a);	/* 0101-1011 */
> +	reg_data |= 0x20;	/* 0010-0000 */
> +	err = regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, reg_data);
> +	if (err < 0)
> +		return err;
> +
> +	/* clearing RTC Adjust register */
> +	err = regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_ADJUST, 0);
> +	if (err)
> +		return err;
> +
> +	return regmap_update_bits(rtc->rn5t618->regmap,
> +					RN5T618_RTC_CTRL1,
> +					CTRL1_24HR, CTRL1_24HR);
> +}
> +
> +static int rc5t619_rtc_read_time(struct device *dev, struct rtc_time *tm)
> +{
> +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> +	u8 buff[7];
> +	int err;
> +	int cent_flag;
> +	unsigned int ctrl1;
> +	unsigned int ctrl2;
> +
> +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
> +	if (err < 0)
> +		return err;
> +
> +	if (ctrl2 & CTRL2_PON)
> +		return -EINVAL;
> +
> +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
> +	if (err < 0)
> +		return err;
> +
> +	err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS,
> +			       buff, sizeof(buff));
> +	if (err < 0)
> +		return err;
> +
> +	if (buff[5] & MONTH_CENTFLAG)
> +		cent_flag = 1;
> +	else
> +		cent_flag = 0;
> +
> +	tm->tm_sec  = bcd2bin(buff[0]);
> +	tm->tm_min  = bcd2bin(buff[1]);
> +
> +	if (ctrl1 & CTRL1_24HR)
> +		tm->tm_hour = bcd2bin(buff[2]);
> +	else
> +		tm->tm_hour = rtc5t619_12hour_bcd2bin(buff[2]);
> +
> +	tm->tm_wday = bcd2bin(buff[3]);
> +	tm->tm_mday = bcd2bin(buff[4]);
> +	tm->tm_mon  = bcd2bin(buff[5] & 0x1f) - 1; /* back to system 0-11 */
> +	tm->tm_year = bcd2bin(buff[6]) + 100 * cent_flag;
> +
> +	return 0;
> +}
> +
> +static int rc5t619_rtc_set_time(struct device *dev, struct rtc_time *tm)
> +{
> +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> +	u8 buff[7];
> +	int err;
> +	int cent_flag;
> +	unsigned int ctrl1;
> +	unsigned int ctrl2;
> +
> +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
> +	if (err < 0)
> +		return err;
> +
> +	if (ctrl2 & CTRL2_PON)
> +		rc5t619_rtc_pon_setup(dev);
> +
> +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
> +	if (err < 0)
> +		return err;
> +
> +	if (tm->tm_year >= 100)
> +		cent_flag = 1;
> +	else
> +		cent_flag = 0;
> +
> +	buff[0] = bin2bcd(tm->tm_sec);
> +	buff[1] = bin2bcd(tm->tm_min);
> +
> +	if (ctrl1 & CTRL1_24HR)
> +		buff[2] = bin2bcd(tm->tm_hour);
> +	else
> +		buff[2] = rtc5t619_12hour_bin2bcd(tm->tm_hour);
> +
> +	buff[3] = bin2bcd(tm->tm_wday);
> +	buff[4] = bin2bcd(tm->tm_mday);
> +	buff[5] = bin2bcd(tm->tm_mon + 1);	/* system set 0-11 */
> +	buff[6] = bin2bcd(tm->tm_year - cent_flag * 100);
> +
> +	if (cent_flag)
> +		buff[5] |= MONTH_CENTFLAG;
> +
> +	err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS,
> +				buff, sizeof(buff));
> +	if (err < 0) {
> +		dev_err(dev, "failed to program new time: %d\n", err);
> +		return err;
> +	}
> +
> +	return 0;
> +}
> +
> +static int rc5t619_rtc_alarm_is_enabled(struct device *dev,  uint8_t *enabled)
> +{
> +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> +	int err;
> +	unsigned int reg_data;
> +
> +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &reg_data);
> +	if (err)
> +		return err;
> +
> +	if (reg_data & CTRL1_ALARM_ENABLED)
> +		*enabled = 1;
> +	else
> +		*enabled = 0;
> +
> +	return err;
> +}
> +
> +/* 0-disable, 1-enable */
> +static int rc5t619_rtc_alarm_enable(struct device *dev, unsigned int enabled)
> +{
> +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> +
> +	return regmap_update_bits(rtc->rn5t618->regmap,
> +			RN5T618_RTC_CTRL1,
> +			CTRL1_ALARM_ENABLED,
> +			enabled ? CTRL1_ALARM_ENABLED : 0);
> +}
> +
> +static int rc5t619_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> +{
> +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> +	u8 buff[6];
> +	unsigned int buff_cent;
> +	int err;
> +	int cent_flag;
> +	unsigned int ctrl1;
> +
> +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
> +	if (err)
> +		return err;
> +
> +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_MONTH, &buff_cent);
> +	if (err < 0) {
> +		dev_err(dev, "failed to read time: %d\n", err);
> +		return err;
> +	}
> +
> +	if (buff_cent & MONTH_CENTFLAG)
> +		cent_flag = 1;
> +	else
> +		cent_flag = 0;
> +
> +	err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC,
> +			       buff, sizeof(buff));
> +	if (err)
> +		return err;
> +
> +	buff[3] = buff[3] & 0x3f;
> +
> +	alrm->time.tm_sec  = bcd2bin(buff[0]);
> +	alrm->time.tm_min  = bcd2bin(buff[1]);
> +
> +	if (ctrl1 & CTRL1_24HR)
> +		alrm->time.tm_hour = bcd2bin(buff[2]);
> +	else
> +		alrm->time.tm_hour = rtc5t619_12hour_bcd2bin(buff[2]);
> +
> +	alrm->time.tm_mday = bcd2bin(buff[3]);
> +	alrm->time.tm_mon  = bcd2bin(buff[4]) - 1;
> +	alrm->time.tm_year = bcd2bin(buff[5]) + 100 * cent_flag;
> +	alrm->enabled = !!(ctrl1 & CTRL1_ALARM_ENABLED);
> +	dev_dbg(dev, "read alarm: %ptR\n", &alrm->time);
> +
> +	return 0;
> +}
> +
> +static int rc5t619_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> +{
> +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> +	u8 buff[6];
> +	int err;
> +	int cent_flag;
> +	unsigned int ctrl1;
> +
> +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
> +	if (err)
> +		return err;
> +
> +	err = rc5t619_rtc_alarm_enable(dev, 0);
> +	if (err < 0)
> +		return err;
> +
> +	if (rtc->irq == -1)
> +		return -EINVAL;
> +
> +	if (alrm->enabled == 0)
> +		return 0;
> +
> +	if (alrm->time.tm_year >= 100)
> +		cent_flag = 1;
> +	else
> +		cent_flag = 0;
> +
> +	alrm->time.tm_mon += 1;
> +	buff[0] = bin2bcd(alrm->time.tm_sec);
> +	buff[1] = bin2bcd(alrm->time.tm_min);
> +
> +	if (ctrl1 & CTRL1_24HR)
> +		buff[2] = bin2bcd(alrm->time.tm_hour);
> +	else
> +		buff[2] = rtc5t619_12hour_bin2bcd(alrm->time.tm_hour);
> +
> +	buff[3] = bin2bcd(alrm->time.tm_mday);
> +	buff[4] = bin2bcd(alrm->time.tm_mon);
> +	buff[5] = bin2bcd(alrm->time.tm_year - 100 * cent_flag);
> +	buff[3] |= MDAY_DAL_EXT;
> +
> +	err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC,
> +				buff, sizeof(buff));
> +	if (err < 0)
> +		return err;
> +
> +	return rc5t619_rtc_alarm_enable(dev, alrm->enabled);
> +}
> +
> +static const struct rtc_class_ops rc5t619_rtc_ops = {
> +	.read_time	= rc5t619_rtc_read_time,
> +	.set_time	= rc5t619_rtc_set_time,
> +	.set_alarm	= rc5t619_rtc_set_alarm,
> +	.read_alarm	= rc5t619_rtc_read_alarm,
> +	.alarm_irq_enable = rc5t619_rtc_alarm_enable,
> +};
> +
> +static int rc5t619_rtc_alarm_flag_clr(struct device *dev)
> +{
> +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> +
> +	/* clear alarm-D status bits.*/
> +	return regmap_update_bits(rtc->rn5t618->regmap,
> +				RN5T618_RTC_CTRL2,
> +				CTRL2_ALARM_STATUS | CTRL2_CTC, 0);
> +}
> +
> +static irqreturn_t rc5t619_rtc_irq(int irq, void *data)
> +{
> +	struct device *dev = data;
> +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> +
> +	rc5t619_rtc_alarm_flag_clr(dev);
> +
> +	rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
> +	return IRQ_HANDLED;
> +}
> +
> +static int rc5t619_rtc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent);
> +	struct rc5t619_rtc *rtc;
> +	unsigned int ctrl2;
> +	int err;
> +
> +	rtc = devm_kzalloc(dev, sizeof(*rtc), GFP_KERNEL);
> +	if (IS_ERR(rtc)) {
> +		err = PTR_ERR(rtc);
> +		return -ENOMEM;
> +	}
> +
> +	rtc->rn5t618 = rn5t618;
> +
> +	dev_set_drvdata(dev, rtc);
> +	rtc->irq = -1;
> +
> +	if (rn5t618->irq_data)
> +		rtc->irq = regmap_irq_get_virq(rn5t618->irq_data,
> +					       RN5T618_IRQ_RTC);
> +
> +	if (rtc->irq  < 0)
> +		rtc->irq = -1;
> +
> +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
> +	if (err < 0)
> +		return err;
> +
> +	/* disable rtc periodic function */
> +	err = rc5t619_rtc_periodic_disable(&pdev->dev);
> +	if (err)
> +		return err;
> +
> +	if (ctrl2 & CTRL2_PON) {
> +		err = rc5t619_rtc_alarm_flag_clr(&pdev->dev);
> +		if (err)
> +			return err;
> +	}
> +
> +	rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
> +	if (IS_ERR(rtc->rtc)) {
> +		err = PTR_ERR(rtc->rtc);
> +		dev_err(dev, "RTC device register: err %d\n", err);
> +		return err;
> +	}
> +
> +	rtc->rtc->ops = &rc5t619_rtc_ops;
> +	rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_1900;
> +	rtc->rtc->range_max = RTC_TIMESTAMP_END_2099;
> +
> +	/* set interrupt and enable it */
> +	if (rtc->irq != -1) {
> +		err = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
> +						rc5t619_rtc_irq,
> +						IRQF_ONESHOT,
> +						"rtc-rc5t619",
> +						&pdev->dev);
> +		if (err < 0) {
> +			dev_err(&pdev->dev, "request IRQ:%d fail\n", rtc->irq);
> +			rtc->irq = -1;
> +
> +			err = rc5t619_rtc_alarm_enable(&pdev->dev, 0);
> +			if (err)
> +				return err;
> +
> +		} else {
> +			/* enable wake */
> +			device_init_wakeup(&pdev->dev, 1);
> +			enable_irq_wake(rtc->irq);
> +		}
> +	} else {
> +		/* system don't want to using alarm interrupt, so close it */
> +		err = rc5t619_rtc_alarm_enable(&pdev->dev, 0);
> +		if (err)
> +			return err;
> +
> +		dev_warn(&pdev->dev, "rc5t619 interrupt is disabled\n");
> +	}
> +
> +	return rtc_register_device(rtc->rtc);
> +}
> +
> +static struct platform_driver rc5t619_rtc_driver = {
> +	.driver	= {
> +		.name	= "rc5t619-rtc",
> +	},
> +	.probe	= rc5t619_rtc_probe,
> +};
> +
> +module_platform_driver(rc5t619_rtc_driver);
> +MODULE_ALIAS("platform:rc5t619-rtc");
> +MODULE_DESCRIPTION("RICOH RC5T619 RTC driver");
> +MODULE_LICENSE("GPL");
> -- 
> 2.20.1
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCH v3 1/6] dt-bindings: mfd: rn5t618: Document optional property interrupts

[Lee Jones]

On Fri, 29 Nov 2019, Andreas Kemnade wrote:

> These chips use interrupts for various things like rtc alarm.
> 
> Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
> ---
>  Documentation/devicetree/bindings/mfd/rn5t618.txt | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/rn5t618.txt b/Documentation/devicetree/bindings/mfd/rn5t618.txt
> index b74e5e94d1cb..05650e1ab28a 100644
> --- a/Documentation/devicetree/bindings/mfd/rn5t618.txt
> +++ b/Documentation/devicetree/bindings/mfd/rn5t618.txt
> @@ -15,6 +15,7 @@ Required properties:
>   - reg: the I2C slave address of the device
>  
>  Optional properties:
> + - interrupts: interrupt mapping for IRQ

Please link to the document that describes it, as below.

NB: Relative paths are usually preferred.

>   - system-power-controller:
>     See Documentation/devicetree/bindings/power/power-controller.txt
>  
> @@ -32,6 +33,8 @@ Example:
>  	pmic@32 {
>  		compatible = "ricoh,rn5t618";
>  		reg = <0x32>;
> +		interrupt-parent = <&gpio5>;
> +		interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
>  		system-power-controller;
>  
>  		regulators {

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH v3 2/6] mfd: rn5t618: prepare for irq handling

[Lee Jones]

On Fri, 29 Nov 2019, Andreas Kemnade wrote:

> rn5t618 currently lacks irq handling. To prepare implementation

"RN5T618"
"IRQ"

> in a rn5t618-irq.c, move main file to rn5t618-core.c

Why do you *need* to call it "core"?

> Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
> ---
>  drivers/mfd/Makefile                      | 2 ++
>  drivers/mfd/{rn5t618.c => rn5t618-core.c} | 0
>  2 files changed, 2 insertions(+)
>  rename drivers/mfd/{rn5t618.c => rn5t618-core.c} (100%)
> 
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index c1067ea46204..110ea700231b 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -216,6 +216,8 @@ obj-$(CONFIG_MFD_PALMAS)	+= palmas.o
>  obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o
>  obj-$(CONFIG_MFD_RC5T583)	+= rc5t583.o rc5t583-irq.o
>  obj-$(CONFIG_MFD_RK808)		+= rk808.o
> +
> +rn5t618-objs			:= rn5t618-core.o
>  obj-$(CONFIG_MFD_RN5T618)	+= rn5t618.o
>  obj-$(CONFIG_MFD_SEC_CORE)	+= sec-core.o sec-irq.o
>  obj-$(CONFIG_MFD_SYSCON)	+= syscon.o
> diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618-core.c
> similarity index 100%
> rename from drivers/mfd/rn5t618.c
> rename to drivers/mfd/rn5t618-core.c

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH v3 3/6] mfd: rn5t618: add irq support

[Lee Jones]

On Fri, 29 Nov 2019, Andreas Kemnade wrote:

> This adds support for irq handling in the rc5t619 which is required

Please capitalise abbreviations and device names (as they do in the
datasheet).

> for properly implementing subdevices like rtc.

"RTC"

> For now only definitions for the variant rc5t619 are included.
> 
> Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
> ---
> Changes in v3:
> alignment cleanup
> 
> Changes in v2:
> - no dead code, did some more testing and thinking for that
> - remove extra empty lines
> 
>  drivers/mfd/Kconfig         |  1 +
>  drivers/mfd/Makefile        |  2 +-
>  drivers/mfd/rn5t618-core.c  | 34 ++++++++++++++-
>  drivers/mfd/rn5t618-irq.c   | 85 +++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/rn5t618.h | 16 +++++++
>  5 files changed, 136 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/mfd/rn5t618-irq.c
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index ae24d3ea68ea..522e068d0082 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1057,6 +1057,7 @@ config MFD_RN5T618
>  	depends on OF
>  	select MFD_CORE
>  	select REGMAP_I2C
> +	select REGMAP_IRQ
>  	help
>  	  Say yes here to add support for the Ricoh RN5T567,
>  	  RN5T618, RC5T619 PMIC.
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 110ea700231b..2906d5db67d0 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -217,7 +217,7 @@ obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o
>  obj-$(CONFIG_MFD_RC5T583)	+= rc5t583.o rc5t583-irq.o
>  obj-$(CONFIG_MFD_RK808)		+= rk808.o
>  
> -rn5t618-objs			:= rn5t618-core.o
> +rn5t618-objs			:= rn5t618-core.o rn5t618-irq.o
>  obj-$(CONFIG_MFD_RN5T618)	+= rn5t618.o
>  obj-$(CONFIG_MFD_SEC_CORE)	+= sec-core.o sec-irq.o
>  obj-$(CONFIG_MFD_SYSCON)	+= syscon.o
> diff --git a/drivers/mfd/rn5t618-core.c b/drivers/mfd/rn5t618-core.c
> index da5cd9c92a59..1e2326217681 100644
> --- a/drivers/mfd/rn5t618-core.c
> +++ b/drivers/mfd/rn5t618-core.c
> @@ -8,6 +8,7 @@
>  
>  #include <linux/delay.h>
>  #include <linux/i2c.h>
> +#include <linux/interrupt.h>
>  #include <linux/mfd/core.h>
>  #include <linux/mfd/rn5t618.h>
>  #include <linux/module.h>
> @@ -105,7 +106,8 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
>  
>  	i2c_set_clientdata(i2c, priv);
>  	priv->variant = (long)of_id->data;
> -
> +	priv->chip_irq = i2c->irq;
> +	priv->dev = &i2c->dev;

'\n'

>  	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
>  	if (IS_ERR(priv->regmap)) {
>  		ret = PTR_ERR(priv->regmap);
> @@ -137,6 +139,11 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
>  		return ret;
>  	}
>  
> +	if (priv->chip_irq > 0) {
> +		if (rn5t618_irq_init(priv))
> +			priv->chip_irq = 0;
> +	}
> +
>  	return 0;
>  }
>  
> @@ -154,15 +161,40 @@ static int rn5t618_i2c_remove(struct i2c_client *i2c)
>  	return 0;
>  }
>  
> +static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
> +{
> +	struct rn5t618 *priv = dev_get_drvdata(dev);
> +
> +	if (priv->chip_irq)
> +		disable_irq(priv->chip_irq);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
> +{
> +	struct rn5t618 *priv = dev_get_drvdata(dev);
> +
> +	if (priv->chip_irq)
> +		enable_irq(priv->chip_irq);
> +
> +	return 0;
> +}
> +
>  static const struct i2c_device_id rn5t618_i2c_id[] = {
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);

Not this patch I know, but it's strange to see this empty.

> +static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
> +			rn5t618_i2c_suspend,
> +			rn5t618_i2c_resume);
> +
>  static struct i2c_driver rn5t618_i2c_driver = {
>  	.driver = {
>  		.name = "rn5t618",
>  		.of_match_table = of_match_ptr(rn5t618_of_match),
> +		.pm = &rn5t618_i2c_dev_pm_ops,
>  	},
>  	.probe = rn5t618_i2c_probe,
>  	.remove = rn5t618_i2c_remove,
> diff --git a/drivers/mfd/rn5t618-irq.c b/drivers/mfd/rn5t618-irq.c

Why does this need to be separate from the core file?

> new file mode 100644
> index 000000000000..8a4c56429768
> --- /dev/null
> +++ b/drivers/mfd/rn5t618-irq.c
> @@ -0,0 +1,85 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2019 Andreas Kemnade
> + */
> +#include <linux/device.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +
> +#include <linux/mfd/rn5t618.h>
> +
> +static const struct regmap_irq rc5t619_irqs[] = {
> +	[RN5T618_IRQ_SYS] = {
> +		.reg_offset = 0,
> +		.mask = (0 << 1)
> +	},
> +	[RN5T618_IRQ_DCDC] = {
> +		.reg_offset = 0,
> +		.mask = (1 << 1)

BIT()

> +	},
> +	[RN5T618_IRQ_RTC]  = {
> +		.reg_offset = 0,
> +		.mask = (1 << 2)
> +	},
> +	[RN5T618_IRQ_ADC] = {
> +		.reg_offset = 0,
> +		.mask = (1 << 3)
> +	},
> +	[RN5T618_IRQ_GPIO] = {
> +		.reg_offset = 0,
> +		.mask = (1 << 4)
> +	},
> +	[RN5T618_IRQ_CHG] = {
> +		.reg_offset = 0,
> +		.mask = (1 << 6),
> +	}
> +};

There are probably macros available to tidy this up.

Take a look in include/linux/regmap.h

> +static const struct regmap_irq_chip rc5t619_irq_chip = {
> +	.name = "rc5t619",
> +	.irqs = rc5t619_irqs,
> +	.num_irqs = ARRAY_SIZE(rc5t619_irqs),
> +	.num_regs = 1,
> +	.status_base = RN5T618_INTMON,
> +	.mask_base = RN5T618_INTEN,
> +	.mask_invert = true,
> +};
> +
> +int rn5t618_irq_init(struct rn5t618 *rn5t618)
> +{
> +	const struct regmap_irq_chip *irq_chip;
> +	int ret;
> +
> +	if (!rn5t618->chip_irq)
> +		return 0;
> +
> +	switch (rn5t618->variant) {
> +	case RC5T619:
> +		irq_chip = &rc5t619_irq_chip;
> +		break;
> +
> +		/* TODO: check irq definitions for other variants */

No need for this.  It's implied.

OOI, when support for more variants be added?

> +	default:
> +		irq_chip = NULL;
> +		break;
> +	}
> +
> +	if (!irq_chip) {
> +		dev_err(rn5t618->dev, "no IRQ definition known for variant\n");

How about '"Variant %d not currently supported", rn5t618->variant'

> +		return -ENOENT;
> +	}
> +
> +	ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
> +				       rn5t618->chip_irq,
> +				       IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> +				       0, irq_chip, &rn5t618->irq_data);
> +	if (ret != 0) {

if (ret)

> +		dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> diff --git a/include/linux/mfd/rn5t618.h b/include/linux/mfd/rn5t618.h
> index d62ef48060b5..edd2b6485e3b 100644
> --- a/include/linux/mfd/rn5t618.h
> +++ b/include/linux/mfd/rn5t618.h
> @@ -242,9 +242,25 @@ enum {
>  	RC5T619,
>  };
>  
> +/* RN5T618 IRQ definitions */
> +enum {
> +	RN5T618_IRQ_SYS,

= 0?

> +	RN5T618_IRQ_DCDC,
> +	RN5T618_IRQ_RTC,
> +	RN5T618_IRQ_ADC,
> +	RN5T618_IRQ_GPIO,
> +	RN5T618_IRQ_CHG,
> +	RN5T618_NR_IRQS,
> +};
> +
>  struct rn5t618 {
>  	struct regmap *regmap;
> +	struct device *dev;
>  	long variant;
> +
> +	int chip_irq;

Are there any other kinds of IRQ?

If you don't have to differentiate between multiple, just 'irq' will
do.

This could also get confused with 'irq_chip'.

> +	struct regmap_irq_chip_data *irq_data;
>  };
>  
> +extern int rn5t618_irq_init(struct rn5t618 *rn5t618);
>  #endif /* __LINUX_MFD_RN5T618_H */

-- 
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Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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Re: [PATCH v3 3/6] mfd: rn5t618: add irq support

[Andreas Kemnade]

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On Tue, 10 Dec 2019 09:32:25 +0000
Lee Jones <lee.jones@linaro.org> wrote:

> On Fri, 29 Nov 2019, Andreas Kemnade wrote:
> 
> > This adds support for irq handling in the rc5t619 which is required  
> 
> Please capitalise abbreviations and device names (as they do in the
> datasheet).
> 
for IRQ vs. irq: I see both things in commit messages. Is there any rule about
that?

> > for properly implementing subdevices like rtc.  
> 
> "RTC"
> 
> > For now only definitions for the variant rc5t619 are included.
> > 
> > Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
> > ---
> > Changes in v3:
> > alignment cleanup
> > 
> > Changes in v2:
> > - no dead code, did some more testing and thinking for that
> > - remove extra empty lines
> > 
> >  drivers/mfd/Kconfig         |  1 +
> >  drivers/mfd/Makefile        |  2 +-
> >  drivers/mfd/rn5t618-core.c  | 34 ++++++++++++++-
> >  drivers/mfd/rn5t618-irq.c   | 85 +++++++++++++++++++++++++++++++++++++
> >  include/linux/mfd/rn5t618.h | 16 +++++++
> >  5 files changed, 136 insertions(+), 2 deletions(-)
> >  create mode 100644 drivers/mfd/rn5t618-irq.c
> > 
> > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > index ae24d3ea68ea..522e068d0082 100644
> > --- a/drivers/mfd/Kconfig
> > +++ b/drivers/mfd/Kconfig
> > @@ -1057,6 +1057,7 @@ config MFD_RN5T618
> >  	depends on OF
> >  	select MFD_CORE
> >  	select REGMAP_I2C
> > +	select REGMAP_IRQ
> >  	help
> >  	  Say yes here to add support for the Ricoh RN5T567,
> >  	  RN5T618, RC5T619 PMIC.
> > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > index 110ea700231b..2906d5db67d0 100644
> > --- a/drivers/mfd/Makefile
> > +++ b/drivers/mfd/Makefile
> > @@ -217,7 +217,7 @@ obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o
> >  obj-$(CONFIG_MFD_RC5T583)	+= rc5t583.o rc5t583-irq.o
> >  obj-$(CONFIG_MFD_RK808)		+= rk808.o
> >  
> > -rn5t618-objs			:= rn5t618-core.o
> > +rn5t618-objs			:= rn5t618-core.o rn5t618-irq.o
> >  obj-$(CONFIG_MFD_RN5T618)	+= rn5t618.o
> >  obj-$(CONFIG_MFD_SEC_CORE)	+= sec-core.o sec-irq.o
> >  obj-$(CONFIG_MFD_SYSCON)	+= syscon.o
> > diff --git a/drivers/mfd/rn5t618-core.c b/drivers/mfd/rn5t618-core.c
> > index da5cd9c92a59..1e2326217681 100644
> > --- a/drivers/mfd/rn5t618-core.c
> > +++ b/drivers/mfd/rn5t618-core.c
> > @@ -8,6 +8,7 @@
> >  
> >  #include <linux/delay.h>
> >  #include <linux/i2c.h>
> > +#include <linux/interrupt.h>
> >  #include <linux/mfd/core.h>
> >  #include <linux/mfd/rn5t618.h>
> >  #include <linux/module.h>
> > @@ -105,7 +106,8 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
> >  
> >  	i2c_set_clientdata(i2c, priv);
> >  	priv->variant = (long)of_id->data;
> > -
> > +	priv->chip_irq = i2c->irq;
> > +	priv->dev = &i2c->dev;  
> 
> '\n'
> 
> >  	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
> >  	if (IS_ERR(priv->regmap)) {
> >  		ret = PTR_ERR(priv->regmap);
> > @@ -137,6 +139,11 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
> >  		return ret;
> >  	}
> >  
> > +	if (priv->chip_irq > 0) {
> > +		if (rn5t618_irq_init(priv))
> > +			priv->chip_irq = 0;
> > +	}
> > +
> >  	return 0;
> >  }
> >  
> > @@ -154,15 +161,40 @@ static int rn5t618_i2c_remove(struct i2c_client *i2c)
> >  	return 0;
> >  }
> >  
> > +static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
> > +{
> > +	struct rn5t618 *priv = dev_get_drvdata(dev);
> > +
> > +	if (priv->chip_irq)
> > +		disable_irq(priv->chip_irq);
> > +
> > +	return 0;
> > +}
> > +
> > +static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
> > +{
> > +	struct rn5t618 *priv = dev_get_drvdata(dev);
> > +
> > +	if (priv->chip_irq)
> > +		enable_irq(priv->chip_irq);
> > +
> > +	return 0;
> > +}
> > +
> >  static const struct i2c_device_id rn5t618_i2c_id[] = {
> >  	{ }
> >  };
> >  MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);  
> 
> Not this patch I know, but it's strange to see this empty.
>

Yes, should be cleaned up. For now the device tree stuff seems to kick in.
 
> > +static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
> > +			rn5t618_i2c_suspend,
> > +			rn5t618_i2c_resume);
> > +
> >  static struct i2c_driver rn5t618_i2c_driver = {
> >  	.driver = {
> >  		.name = "rn5t618",
> >  		.of_match_table = of_match_ptr(rn5t618_of_match),
> > +		.pm = &rn5t618_i2c_dev_pm_ops,
> >  	},
> >  	.probe = rn5t618_i2c_probe,
> >  	.remove = rn5t618_i2c_remove,
> > diff --git a/drivers/mfd/rn5t618-irq.c b/drivers/mfd/rn5t618-irq.c  
> 
> Why does this need to be separate from the core file?
> 
It does not need. It is not that complex. There will just be another set of
tables for the rn5t618

> > new file mode 100644
> > index 000000000000..8a4c56429768
> > --- /dev/null
> > +++ b/drivers/mfd/rn5t618-irq.c
> > @@ -0,0 +1,85 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright 2019 Andreas Kemnade
> > + */
> > +#include <linux/device.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/irq.h>
> > +#include <linux/module.h>
> > +#include <linux/regmap.h>
> > +
> > +#include <linux/mfd/rn5t618.h>
> > +
> > +static const struct regmap_irq rc5t619_irqs[] = {
> > +	[RN5T618_IRQ_SYS] = {
> > +		.reg_offset = 0,
> > +		.mask = (0 << 1)
> > +	},
> > +	[RN5T618_IRQ_DCDC] = {
> > +		.reg_offset = 0,
> > +		.mask = (1 << 1)  
> 
> BIT()
> 
yes, makes things more readable.

> > +	},
> > +	[RN5T618_IRQ_RTC]  = {
> > +		.reg_offset = 0,
> > +		.mask = (1 << 2)
> > +	},
> > +	[RN5T618_IRQ_ADC] = {
> > +		.reg_offset = 0,
> > +		.mask = (1 << 3)
> > +	},
> > +	[RN5T618_IRQ_GPIO] = {
> > +		.reg_offset = 0,
> > +		.mask = (1 << 4)
> > +	},
> > +	[RN5T618_IRQ_CHG] = {
> > +		.reg_offset = 0,
> > +		.mask = (1 << 6),
> > +	}
> > +};  
> 
> There are probably macros available to tidy this up.
> 
> Take a look in include/linux/regmap.h
> 
I will have a look.

> > +static const struct regmap_irq_chip rc5t619_irq_chip = {
> > +	.name = "rc5t619",
> > +	.irqs = rc5t619_irqs,
> > +	.num_irqs = ARRAY_SIZE(rc5t619_irqs),
> > +	.num_regs = 1,
> > +	.status_base = RN5T618_INTMON,
> > +	.mask_base = RN5T618_INTEN,
> > +	.mask_invert = true,
> > +};
> > +
> > +int rn5t618_irq_init(struct rn5t618 *rn5t618)
> > +{
> > +	const struct regmap_irq_chip *irq_chip;
> > +	int ret;
> > +
> > +	if (!rn5t618->chip_irq)
> > +		return 0;
> > +
> > +	switch (rn5t618->variant) {
> > +	case RC5T619:
> > +		irq_chip = &rc5t619_irq_chip;
> > +		break;
> > +
> > +		/* TODO: check irq definitions for other variants */  
> 
> No need for this.  It's implied.
> 
> OOI, when support for more variants be added?
> 
I have done research about the RN5T618. It has just the RTC IRQ missing, I could just
add the table for it to prepare the path for others. I cannot test it but
since there are no users yet, it does not harm that it is not well-tested.

No idea about the RN5T567.

> > +	default:
> > +		irq_chip = NULL;
> > +		break;
> > +	}
> > +
> > +	if (!irq_chip) {
> > +		dev_err(rn5t618->dev, "no IRQ definition known for variant\n");  
> 
> How about '"Variant %d not currently supported", rn5t618->variant'
> 
makes sense.

> > +		return -ENOENT;
> > +	}
> > +
> > +	ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
> > +				       rn5t618->chip_irq,
> > +				       IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> > +				       0, irq_chip, &rn5t618->irq_data);
> > +	if (ret != 0) {  
> 
> if (ret)
> 
> > +		dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
> > +		return ret;
> > +	}
> > +
> > +	return 0;
> > +}
> > diff --git a/include/linux/mfd/rn5t618.h b/include/linux/mfd/rn5t618.h
> > index d62ef48060b5..edd2b6485e3b 100644
> > --- a/include/linux/mfd/rn5t618.h
> > +++ b/include/linux/mfd/rn5t618.h
> > @@ -242,9 +242,25 @@ enum {
> >  	RC5T619,
> >  };
> >  
> > +/* RN5T618 IRQ definitions */
> > +enum {
> > +	RN5T618_IRQ_SYS,  
> 
> = 0?
> 
> > +	RN5T618_IRQ_DCDC,
> > +	RN5T618_IRQ_RTC,
> > +	RN5T618_IRQ_ADC,
> > +	RN5T618_IRQ_GPIO,
> > +	RN5T618_IRQ_CHG,
> > +	RN5T618_NR_IRQS,
> > +};
> > +
> >  struct rn5t618 {
> >  	struct regmap *regmap;
> > +	struct device *dev;
> >  	long variant;
> > +
> > +	int chip_irq;  
> 
> Are there any other kinds of IRQ?
> 
there is some separate battery low input for the charger which
could be modeled as an IRQ.
But that could be handled entirely there when I am at it and
in the corresponding subdevice. 

Regards,
Andreas

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Re: [PATCH v3 2/6] mfd: rn5t618: prepare for irq handling

[Andreas Kemnade]

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accidently send it only to Lee, that was unintended.

On Tue, 10 Dec 2019 09:13:51 +0000
Lee Jones <lee.jones@linaro.org> wrote:

> On Fri, 29 Nov 2019, Andreas Kemnade wrote:
> 
> > rn5t618 currently lacks irq handling. To prepare implementation  
> 
> "RN5T618"
> "IRQ"
> 
> > in a rn5t618-irq.c, move main file to rn5t618-core.c  
> 
> Why do you *need* to call it "core"?
> 
Well, the pattern is that irq stuff is in a separate file
for other mfds. And when I want to link things together to a rn5t618.[k]o
I think that none objects cannot be called rn5t618.o and so no source
file rn5t618.o. Am I wrong here? Of course if things can live in one file
this thing is not needed.

Regards,
Andreas

> > Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
> > ---
> >  drivers/mfd/Makefile                      | 2 ++
> >  drivers/mfd/{rn5t618.c => rn5t618-core.c} | 0
> >  2 files changed, 2 insertions(+)
> >  rename drivers/mfd/{rn5t618.c => rn5t618-core.c} (100%)
> > 
> > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > index c1067ea46204..110ea700231b 100644
> > --- a/drivers/mfd/Makefile
> > +++ b/drivers/mfd/Makefile
> > @@ -216,6 +216,8 @@ obj-$(CONFIG_MFD_PALMAS)	+= palmas.o
> >  obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o
> >  obj-$(CONFIG_MFD_RC5T583)	+= rc5t583.o rc5t583-irq.o
> >  obj-$(CONFIG_MFD_RK808)		+= rk808.o
> > +
> > +rn5t618-objs			:= rn5t618-core.o
> >  obj-$(CONFIG_MFD_RN5T618)	+= rn5t618.o
> >  obj-$(CONFIG_MFD_SEC_CORE)	+= sec-core.o sec-irq.o
> >  obj-$(CONFIG_MFD_SYSCON)	+= syscon.o
> > diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618-core.c
> > similarity index 100%
> > rename from drivers/mfd/rn5t618.c
> > rename to drivers/mfd/rn5t618-core.c  
> 
> -- 
> Lee Jones [李琼斯]
> Linaro Services Technical Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog
> 

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Re: [PATCH v3 2/6] mfd: rn5t618: prepare for irq handling

[Lee Jones]

On Tue, 10 Dec 2019, Andreas Kemnade wrote:

> accidently send it only to Lee, that was unintended.
> 
> On Tue, 10 Dec 2019 09:13:51 +0000
> Lee Jones <lee.jones@linaro.org> wrote:
> 
> > On Fri, 29 Nov 2019, Andreas Kemnade wrote:
> > 
> > > rn5t618 currently lacks irq handling. To prepare implementation  
> > 
> > "RN5T618"
> > "IRQ"
> > 
> > > in a rn5t618-irq.c, move main file to rn5t618-core.c  
> > 
> > Why do you *need* to call it "core"?
> > 
> Well, the pattern is that irq stuff is in a separate file
> for other mfds. And when I want to link things together to a rn5t618.[k]o
> I think that none objects cannot be called rn5t618.o and so no source
> file rn5t618.o. Am I wrong here? Of course if things can live in one file
> this thing is not needed.

Unless you have a good reason for separating out the code, having it
all in a single file is preferred.

> > > Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
> > > ---
> > >  drivers/mfd/Makefile                      | 2 ++
> > >  drivers/mfd/{rn5t618.c => rn5t618-core.c} | 0
> > >  2 files changed, 2 insertions(+)
> > >  rename drivers/mfd/{rn5t618.c => rn5t618-core.c} (100%)
> > > 
> > > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > > index c1067ea46204..110ea700231b 100644
> > > --- a/drivers/mfd/Makefile
> > > +++ b/drivers/mfd/Makefile
> > > @@ -216,6 +216,8 @@ obj-$(CONFIG_MFD_PALMAS)	+= palmas.o
> > >  obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o
> > >  obj-$(CONFIG_MFD_RC5T583)	+= rc5t583.o rc5t583-irq.o
> > >  obj-$(CONFIG_MFD_RK808)		+= rk808.o
> > > +
> > > +rn5t618-objs			:= rn5t618-core.o
> > >  obj-$(CONFIG_MFD_RN5T618)	+= rn5t618.o
> > >  obj-$(CONFIG_MFD_SEC_CORE)	+= sec-core.o sec-irq.o
> > >  obj-$(CONFIG_MFD_SYSCON)	+= syscon.o
> > > diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618-core.c
> > > similarity index 100%
> > > rename from drivers/mfd/rn5t618.c
> > > rename to drivers/mfd/rn5t618-core.c  
> > 



-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH v3 3/6] mfd: rn5t618: add irq support

[Lee Jones]

On Tue, 10 Dec 2019, Andreas Kemnade wrote:

> On Tue, 10 Dec 2019 09:32:25 +0000
> Lee Jones <lee.jones@linaro.org> wrote:
> 
> > On Fri, 29 Nov 2019, Andreas Kemnade wrote:
> > 
> > > This adds support for irq handling in the rc5t619 which is required  
> > 
> > Please capitalise abbreviations and device names (as they do in the
> > datasheet).
> > 
> for IRQ vs. irq: I see both things in commit messages. Is there any rule about
> that?

No, it's preference.  Mine is to follow the conventions set out by
standard English grammar.  Capital letters to start sentences, proper
nouns and abbreviations, etc.

> > > for properly implementing subdevices like rtc.  
> > 
> > "RTC"
> > 
> > > For now only definitions for the variant rc5t619 are included.
> > > 
> > > Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
> > > ---
> > > Changes in v3:
> > > alignment cleanup
> > > 
> > > Changes in v2:
> > > - no dead code, did some more testing and thinking for that
> > > - remove extra empty lines
> > > 
> > >  drivers/mfd/Kconfig         |  1 +
> > >  drivers/mfd/Makefile        |  2 +-
> > >  drivers/mfd/rn5t618-core.c  | 34 ++++++++++++++-
> > >  drivers/mfd/rn5t618-irq.c   | 85 +++++++++++++++++++++++++++++++++++++
> > >  include/linux/mfd/rn5t618.h | 16 +++++++
> > >  5 files changed, 136 insertions(+), 2 deletions(-)
> > >  create mode 100644 drivers/mfd/rn5t618-irq.c
> > > 
> > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > > index ae24d3ea68ea..522e068d0082 100644
> > > --- a/drivers/mfd/Kconfig
> > > +++ b/drivers/mfd/Kconfig
> > > @@ -1057,6 +1057,7 @@ config MFD_RN5T618
> > >  	depends on OF
> > >  	select MFD_CORE
> > >  	select REGMAP_I2C
> > > +	select REGMAP_IRQ
> > >  	help
> > >  	  Say yes here to add support for the Ricoh RN5T567,
> > >  	  RN5T618, RC5T619 PMIC.
> > > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > > index 110ea700231b..2906d5db67d0 100644
> > > --- a/drivers/mfd/Makefile
> > > +++ b/drivers/mfd/Makefile
> > > @@ -217,7 +217,7 @@ obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o
> > >  obj-$(CONFIG_MFD_RC5T583)	+= rc5t583.o rc5t583-irq.o
> > >  obj-$(CONFIG_MFD_RK808)		+= rk808.o
> > >  
> > > -rn5t618-objs			:= rn5t618-core.o
> > > +rn5t618-objs			:= rn5t618-core.o rn5t618-irq.o
> > >  obj-$(CONFIG_MFD_RN5T618)	+= rn5t618.o
> > >  obj-$(CONFIG_MFD_SEC_CORE)	+= sec-core.o sec-irq.o
> > >  obj-$(CONFIG_MFD_SYSCON)	+= syscon.o
> > > diff --git a/drivers/mfd/rn5t618-core.c b/drivers/mfd/rn5t618-core.c
> > > index da5cd9c92a59..1e2326217681 100644
> > > --- a/drivers/mfd/rn5t618-core.c
> > > +++ b/drivers/mfd/rn5t618-core.c
> > > @@ -8,6 +8,7 @@
> > >  
> > >  #include <linux/delay.h>
> > >  #include <linux/i2c.h>
> > > +#include <linux/interrupt.h>
> > >  #include <linux/mfd/core.h>
> > >  #include <linux/mfd/rn5t618.h>
> > >  #include <linux/module.h>
> > > @@ -105,7 +106,8 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
> > >  
> > >  	i2c_set_clientdata(i2c, priv);
> > >  	priv->variant = (long)of_id->data;
> > > -
> > > +	priv->chip_irq = i2c->irq;
> > > +	priv->dev = &i2c->dev;  
> > 
> > '\n'
> > 
> > >  	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
> > >  	if (IS_ERR(priv->regmap)) {
> > >  		ret = PTR_ERR(priv->regmap);
> > > @@ -137,6 +139,11 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
> > >  		return ret;
> > >  	}
> > >  
> > > +	if (priv->chip_irq > 0) {
> > > +		if (rn5t618_irq_init(priv))
> > > +			priv->chip_irq = 0;
> > > +	}
> > > +
> > >  	return 0;
> > >  }
> > >  
> > > @@ -154,15 +161,40 @@ static int rn5t618_i2c_remove(struct i2c_client *i2c)
> > >  	return 0;
> > >  }
> > >  
> > > +static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
> > > +{
> > > +	struct rn5t618 *priv = dev_get_drvdata(dev);
> > > +
> > > +	if (priv->chip_irq)
> > > +		disable_irq(priv->chip_irq);
> > > +
> > > +	return 0;
> > > +}
> > > +
> > > +static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
> > > +{
> > > +	struct rn5t618 *priv = dev_get_drvdata(dev);
> > > +
> > > +	if (priv->chip_irq)
> > > +		enable_irq(priv->chip_irq);
> > > +
> > > +	return 0;
> > > +}
> > > +
> > >  static const struct i2c_device_id rn5t618_i2c_id[] = {
> > >  	{ }
> > >  };
> > >  MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);  
> > 
> > Not this patch I know, but it's strange to see this empty.
> 
> Yes, should be cleaned up. For now the device tree stuff seems to kick in.

I think this can be removed completely.

Just make sure you use .probe2 and it should be automatic.

[...]

> > > +	switch (rn5t618->variant) {
> > > +	case RC5T619:
> > > +		irq_chip = &rc5t619_irq_chip;
> > > +		break;
> > > +
> > > +		/* TODO: check irq definitions for other variants */  
> > 
> > No need for this.  It's implied.
> > 
> > OOI, when support for more variants be added?
> > 
> I have done research about the RN5T618. It has just the RTC IRQ missing, I could just
> add the table for it to prepare the path for others. I cannot test it but
> since there are no users yet, it does not harm that it is not well-tested.

If there are no users and it can't be tested, it should be left out.
We don't want potentially broken, untested code with no users in the
kernel.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH v3 3/6] mfd: rn5t618: add irq support

[Andreas Kemnade]

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On Wed, 11 Dec 2019 07:50:21 +0000
Lee Jones <lee.jones@linaro.org> wrote:

[...]
> > > > +
> > > >  static const struct i2c_device_id rn5t618_i2c_id[] = {
> > > >  	{ }
> > > >  };
> > > >  MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);    
> > > 
> > > Not this patch I know, but it's strange to see this empty.  
> > 
> > Yes, should be cleaned up. For now the device tree stuff seems to kick in.  
> 
> I think this can be removed completely.
> 
> Just make sure you use .probe2 and it should be automatic.
> 
Hmm, I cannot find probe2 but probe_new. So you mean probe_new?

I will send a separate cleanup patch

Regards,
Andreas

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Re: [PATCH v3 6/6] rtc: rtc-rc5t619: add ricoh rc5t619 RTC driver

[Andreas Kemnade]

Hi,

On Mon, 2 Dec 2019 10:39:35 +0100
Alexandre Belloni <alexandre.belloni@bootlin.com> wrote:

> On 29/11/2019 22:20:45+0100, Andreas Kemnade wrote:
> > Add an RTC driver for the RTC device on Ricoh MFD rc5t619,
> > which is implemented as a variant of rn5t618.
> >
will capitalize chip names in the commit text as requested for the other 
patches by Lee.
 
> > rtc-range output:
> > Testing 2000-02-28 23:59:59.
> > OK
> > 
> > Testing 2038-01-19 03:14:07.
> > OK
> > 
> > Testing 2069-12-31 23:59:59.
> > OK
> > 
> > Testing 2099-12-31 23:59:59.
> > KO RTC_RD_TIME returned 22 (line 138)
> > 
> > Testing 2100-02-28 23:59:59.
> > KO RTC_SET_TIME returned 34 (line 122)
> > 
> > Testing 2106-02-07 06:28:15.
> > KO RTC_SET_TIME returned 34 (line 122)
> > 
> > Testing 2262-04-11 23:47:16.
> > KO RTC_SET_TIME returned 34 (line 122)
> > 
> > Signed-off-by: Andreas Kemnade <andreas@kemnade.info>  
> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
>
I will remove
static int rc5t619_rtc_alarm_is_enabled(struct device *dev,  uint8_t *enabled)

since it is unused now so gcc emits a warning, which I have overlooked.
I hope your Acked-by still counts for that.


Regards,
Andreas
 
> > ---
> > - further output cleanup
> > - remove useless toggling of alarm flag in rtc probe
> > - alignment cleanup
> > 
> > Changes in v2:
> > - correct subject line
> > - reset pon flag not at probe but later
> > - initialize things only on pon
> > - 12h handling
> > - ranges
> > - style cleanup
> > - less magic values
> > 
> >  drivers/rtc/Kconfig       |  10 +
> >  drivers/rtc/Makefile      |   1 +
> >  drivers/rtc/rtc-rc5t619.c | 462 ++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 473 insertions(+)
> >  create mode 100644 drivers/rtc/rtc-rc5t619.c
> > 
> > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> > index 1adf9f815652..b8e5bfa8efc6 100644
> > --- a/drivers/rtc/Kconfig
> > +++ b/drivers/rtc/Kconfig
> > @@ -600,6 +600,16 @@ config RTC_DRV_RC5T583
> >  	  This driver can also be built as a module. If so, the module
> >  	  will be called rtc-rc5t583.
> >  
> > +config RTC_DRV_RC5T619
> > +	tristate "RICOH RC5T619 RTC driver"
> > +	depends on MFD_RN5T618
> > +	help
> > +	  If you say yes here you get support for the RTC on the
> > +	  RICOH RC5T619 chips.
> > +
> > +	  This driver can also be built as a module. If so, the module
> > +	  will be called rtc-rc5t619.
> > +
> >  config RTC_DRV_S35390A
> >  	tristate "Seiko Instruments S-35390A"
> >  	select BITREVERSE
> > diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
> > index 4ac8f19fb631..7612912cdf00 100644
> > --- a/drivers/rtc/Makefile
> > +++ b/drivers/rtc/Makefile
> > @@ -137,6 +137,7 @@ obj-$(CONFIG_RTC_DRV_PXA)	+= rtc-pxa.o
> >  obj-$(CONFIG_RTC_DRV_R7301)	+= rtc-r7301.o
> >  obj-$(CONFIG_RTC_DRV_R9701)	+= rtc-r9701.o
> >  obj-$(CONFIG_RTC_DRV_RC5T583)	+= rtc-rc5t583.o
> > +obj-$(CONFIG_RTC_DRV_RC5T619)	+= rtc-rc5t619.o
> >  obj-$(CONFIG_RTC_DRV_RK808)	+= rtc-rk808.o
> >  obj-$(CONFIG_RTC_DRV_RP5C01)	+= rtc-rp5c01.o
> >  obj-$(CONFIG_RTC_DRV_RS5C313)	+= rtc-rs5c313.o
> > diff --git a/drivers/rtc/rtc-rc5t619.c b/drivers/rtc/rtc-rc5t619.c
> > new file mode 100644
> > index 000000000000..1860f3e7f6e7
> > --- /dev/null
> > +++ b/drivers/rtc/rtc-rc5t619.c
> > @@ -0,0 +1,462 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * drivers/rtc/rtc-rc5t619.c
> > + *
> > + * Real time clock driver for RICOH RC5T619 power management chip.
> > + *
> > + * Copyright (C) 2019 Andreas Kemnade
> > + */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/device.h>
> > +#include <linux/errno.h>
> > +#include <linux/init.h>
> > +#include <linux/module.h>
> > +#include <linux/mfd/rn5t618.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +#include <linux/bcd.h>
> > +#include <linux/rtc.h>
> > +#include <linux/slab.h>
> > +#include <linux/irqdomain.h>
> > +
> > +struct rc5t619_rtc {
> > +	int			irq;
> > +	struct rtc_device	*rtc;
> > +	struct rn5t618 *rn5t618;
> > +};
> > +
> > +#define CTRL1_ALARM_ENABLED 0x40
> > +#define CTRL1_24HR 0x20
> > +#define CTRL1_PERIODIC_MASK 0xf
> > +
> > +#define CTRL2_PON 0x10
> > +#define CTRL2_ALARM_STATUS 0x80
> > +#define CTRL2_CTFG 0x4
> > +#define CTRL2_CTC 0x1
> > +
> > +#define MONTH_CENTFLAG 0x80
> > +#define HOUR_PMFLAG 0x20
> > +#define MDAY_DAL_EXT 0x80
> > +
> > +static uint8_t rtc5t619_12hour_bcd2bin(uint8_t hour)
> > +{
> > +	if (hour & HOUR_PMFLAG) {
> > +		hour = bcd2bin(hour & ~HOUR_PMFLAG);
> > +		return hour == 12 ? 12 : 12 + hour;
> > +	}
> > +
> > +	hour = bcd2bin(hour);
> > +	return hour == 12 ? 0 : hour;
> > +}
> > +
> > +static uint8_t rtc5t619_12hour_bin2bcd(uint8_t hour)
> > +{
> > +	if (!hour)
> > +		return 0x12;
> > +
> > +	if (hour < 12)
> > +		return bin2bcd(hour);
> > +
> > +	if (hour == 12)
> > +		return 0x12 | HOUR_PMFLAG;
> > +
> > +	return bin2bcd(hour - 12) | HOUR_PMFLAG;
> > +}
> > +
> > +static int rc5t619_rtc_periodic_disable(struct device *dev)
> > +{
> > +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> > +	int err;
> > +
> > +	/* disable function */
> > +	err = regmap_update_bits(rtc->rn5t618->regmap,
> > +				 RN5T618_RTC_CTRL1, CTRL1_PERIODIC_MASK, 0);
> > +	if (err < 0)
> > +		return err;
> > +
> > +	/* clear alarm flag and CTFG */
> > +	err = regmap_update_bits(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2,
> > +				 CTRL2_ALARM_STATUS | CTRL2_CTFG | CTRL2_CTC,
> > +				 0);
> > +	if (err < 0)
> > +		return err;
> > +
> > +	return 0;
> > +}
> > +
> > +/* things to be done once after power on */
> > +static int rc5t619_rtc_pon_setup(struct device *dev)
> > +{
> > +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> > +	int err;
> > +	unsigned int reg_data;
> > +
> > +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &reg_data);
> > +	if (err < 0)
> > +		return err;
> > +
> > +	/* clear VDET PON */
> > +	reg_data &= ~(CTRL2_PON | CTRL2_CTC | 0x4a);	/* 0101-1011 */
> > +	reg_data |= 0x20;	/* 0010-0000 */
> > +	err = regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, reg_data);
> > +	if (err < 0)
> > +		return err;
> > +
> > +	/* clearing RTC Adjust register */
> > +	err = regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_ADJUST, 0);
> > +	if (err)
> > +		return err;
> > +
> > +	return regmap_update_bits(rtc->rn5t618->regmap,
> > +					RN5T618_RTC_CTRL1,
> > +					CTRL1_24HR, CTRL1_24HR);
> > +}
> > +
> > +static int rc5t619_rtc_read_time(struct device *dev, struct rtc_time *tm)
> > +{
> > +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> > +	u8 buff[7];
> > +	int err;
> > +	int cent_flag;
> > +	unsigned int ctrl1;
> > +	unsigned int ctrl2;
> > +
> > +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
> > +	if (err < 0)
> > +		return err;
> > +
> > +	if (ctrl2 & CTRL2_PON)
> > +		return -EINVAL;
> > +
> > +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
> > +	if (err < 0)
> > +		return err;
> > +
> > +	err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS,
> > +			       buff, sizeof(buff));
> > +	if (err < 0)
> > +		return err;
> > +
> > +	if (buff[5] & MONTH_CENTFLAG)
> > +		cent_flag = 1;
> > +	else
> > +		cent_flag = 0;
> > +
> > +	tm->tm_sec  = bcd2bin(buff[0]);
> > +	tm->tm_min  = bcd2bin(buff[1]);
> > +
> > +	if (ctrl1 & CTRL1_24HR)
> > +		tm->tm_hour = bcd2bin(buff[2]);
> > +	else
> > +		tm->tm_hour = rtc5t619_12hour_bcd2bin(buff[2]);
> > +
> > +	tm->tm_wday = bcd2bin(buff[3]);
> > +	tm->tm_mday = bcd2bin(buff[4]);
> > +	tm->tm_mon  = bcd2bin(buff[5] & 0x1f) - 1; /* back to system 0-11 */
> > +	tm->tm_year = bcd2bin(buff[6]) + 100 * cent_flag;
> > +
> > +	return 0;
> > +}
> > +
> > +static int rc5t619_rtc_set_time(struct device *dev, struct rtc_time *tm)
> > +{
> > +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> > +	u8 buff[7];
> > +	int err;
> > +	int cent_flag;
> > +	unsigned int ctrl1;
> > +	unsigned int ctrl2;
> > +
> > +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
> > +	if (err < 0)
> > +		return err;
> > +
> > +	if (ctrl2 & CTRL2_PON)
> > +		rc5t619_rtc_pon_setup(dev);
> > +
> > +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
> > +	if (err < 0)
> > +		return err;
> > +
> > +	if (tm->tm_year >= 100)
> > +		cent_flag = 1;
> > +	else
> > +		cent_flag = 0;
> > +
> > +	buff[0] = bin2bcd(tm->tm_sec);
> > +	buff[1] = bin2bcd(tm->tm_min);
> > +
> > +	if (ctrl1 & CTRL1_24HR)
> > +		buff[2] = bin2bcd(tm->tm_hour);
> > +	else
> > +		buff[2] = rtc5t619_12hour_bin2bcd(tm->tm_hour);
> > +
> > +	buff[3] = bin2bcd(tm->tm_wday);
> > +	buff[4] = bin2bcd(tm->tm_mday);
> > +	buff[5] = bin2bcd(tm->tm_mon + 1);	/* system set 0-11 */
> > +	buff[6] = bin2bcd(tm->tm_year - cent_flag * 100);
> > +
> > +	if (cent_flag)
> > +		buff[5] |= MONTH_CENTFLAG;
> > +
> > +	err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS,
> > +				buff, sizeof(buff));
> > +	if (err < 0) {
> > +		dev_err(dev, "failed to program new time: %d\n", err);
> > +		return err;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int rc5t619_rtc_alarm_is_enabled(struct device *dev,  uint8_t *enabled)
> > +{
> > +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> > +	int err;
> > +	unsigned int reg_data;
> > +
> > +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &reg_data);
> > +	if (err)
> > +		return err;
> > +
> > +	if (reg_data & CTRL1_ALARM_ENABLED)
> > +		*enabled = 1;
> > +	else
> > +		*enabled = 0;
> > +
> > +	return err;
> > +}
> > +
> > +/* 0-disable, 1-enable */
> > +static int rc5t619_rtc_alarm_enable(struct device *dev, unsigned int enabled)
> > +{
> > +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> > +
> > +	return regmap_update_bits(rtc->rn5t618->regmap,
> > +			RN5T618_RTC_CTRL1,
> > +			CTRL1_ALARM_ENABLED,
> > +			enabled ? CTRL1_ALARM_ENABLED : 0);
> > +}
> > +
> > +static int rc5t619_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> > +{
> > +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> > +	u8 buff[6];
> > +	unsigned int buff_cent;
> > +	int err;
> > +	int cent_flag;
> > +	unsigned int ctrl1;
> > +
> > +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
> > +	if (err)
> > +		return err;
> > +
> > +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_MONTH, &buff_cent);
> > +	if (err < 0) {
> > +		dev_err(dev, "failed to read time: %d\n", err);
> > +		return err;
> > +	}
> > +
> > +	if (buff_cent & MONTH_CENTFLAG)
> > +		cent_flag = 1;
> > +	else
> > +		cent_flag = 0;
> > +
> > +	err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC,
> > +			       buff, sizeof(buff));
> > +	if (err)
> > +		return err;
> > +
> > +	buff[3] = buff[3] & 0x3f;
> > +
> > +	alrm->time.tm_sec  = bcd2bin(buff[0]);
> > +	alrm->time.tm_min  = bcd2bin(buff[1]);
> > +
> > +	if (ctrl1 & CTRL1_24HR)
> > +		alrm->time.tm_hour = bcd2bin(buff[2]);
> > +	else
> > +		alrm->time.tm_hour = rtc5t619_12hour_bcd2bin(buff[2]);
> > +
> > +	alrm->time.tm_mday = bcd2bin(buff[3]);
> > +	alrm->time.tm_mon  = bcd2bin(buff[4]) - 1;
> > +	alrm->time.tm_year = bcd2bin(buff[5]) + 100 * cent_flag;
> > +	alrm->enabled = !!(ctrl1 & CTRL1_ALARM_ENABLED);
> > +	dev_dbg(dev, "read alarm: %ptR\n", &alrm->time);
> > +
> > +	return 0;
> > +}
> > +
> > +static int rc5t619_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> > +{
> > +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> > +	u8 buff[6];
> > +	int err;
> > +	int cent_flag;
> > +	unsigned int ctrl1;
> > +
> > +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
> > +	if (err)
> > +		return err;
> > +
> > +	err = rc5t619_rtc_alarm_enable(dev, 0);
> > +	if (err < 0)
> > +		return err;
> > +
> > +	if (rtc->irq == -1)
> > +		return -EINVAL;
> > +
> > +	if (alrm->enabled == 0)
> > +		return 0;
> > +
> > +	if (alrm->time.tm_year >= 100)
> > +		cent_flag = 1;
> > +	else
> > +		cent_flag = 0;
> > +
> > +	alrm->time.tm_mon += 1;
> > +	buff[0] = bin2bcd(alrm->time.tm_sec);
> > +	buff[1] = bin2bcd(alrm->time.tm_min);
> > +
> > +	if (ctrl1 & CTRL1_24HR)
> > +		buff[2] = bin2bcd(alrm->time.tm_hour);
> > +	else
> > +		buff[2] = rtc5t619_12hour_bin2bcd(alrm->time.tm_hour);
> > +
> > +	buff[3] = bin2bcd(alrm->time.tm_mday);
> > +	buff[4] = bin2bcd(alrm->time.tm_mon);
> > +	buff[5] = bin2bcd(alrm->time.tm_year - 100 * cent_flag);
> > +	buff[3] |= MDAY_DAL_EXT;
> > +
> > +	err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC,
> > +				buff, sizeof(buff));
> > +	if (err < 0)
> > +		return err;
> > +
> > +	return rc5t619_rtc_alarm_enable(dev, alrm->enabled);
> > +}
> > +
> > +static const struct rtc_class_ops rc5t619_rtc_ops = {
> > +	.read_time	= rc5t619_rtc_read_time,
> > +	.set_time	= rc5t619_rtc_set_time,
> > +	.set_alarm	= rc5t619_rtc_set_alarm,
> > +	.read_alarm	= rc5t619_rtc_read_alarm,
> > +	.alarm_irq_enable = rc5t619_rtc_alarm_enable,
> > +};
> > +
> > +static int rc5t619_rtc_alarm_flag_clr(struct device *dev)
> > +{
> > +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> > +
> > +	/* clear alarm-D status bits.*/
> > +	return regmap_update_bits(rtc->rn5t618->regmap,
> > +				RN5T618_RTC_CTRL2,
> > +				CTRL2_ALARM_STATUS | CTRL2_CTC, 0);
> > +}
> > +
> > +static irqreturn_t rc5t619_rtc_irq(int irq, void *data)
> > +{
> > +	struct device *dev = data;
> > +	struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
> > +
> > +	rc5t619_rtc_alarm_flag_clr(dev);
> > +
> > +	rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
> > +	return IRQ_HANDLED;
> > +}
> > +
> > +static int rc5t619_rtc_probe(struct platform_device *pdev)
> > +{
> > +	struct device *dev = &pdev->dev;
> > +	struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent);
> > +	struct rc5t619_rtc *rtc;
> > +	unsigned int ctrl2;
> > +	int err;
> > +
> > +	rtc = devm_kzalloc(dev, sizeof(*rtc), GFP_KERNEL);
> > +	if (IS_ERR(rtc)) {
> > +		err = PTR_ERR(rtc);
> > +		return -ENOMEM;
> > +	}
> > +
> > +	rtc->rn5t618 = rn5t618;
> > +
> > +	dev_set_drvdata(dev, rtc);
> > +	rtc->irq = -1;
> > +
> > +	if (rn5t618->irq_data)
> > +		rtc->irq = regmap_irq_get_virq(rn5t618->irq_data,
> > +					       RN5T618_IRQ_RTC);
> > +
> > +	if (rtc->irq  < 0)
> > +		rtc->irq = -1;
> > +
> > +	err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
> > +	if (err < 0)
> > +		return err;
> > +
> > +	/* disable rtc periodic function */
> > +	err = rc5t619_rtc_periodic_disable(&pdev->dev);
> > +	if (err)
> > +		return err;
> > +
> > +	if (ctrl2 & CTRL2_PON) {
> > +		err = rc5t619_rtc_alarm_flag_clr(&pdev->dev);
> > +		if (err)
> > +			return err;
> > +	}
> > +
> > +	rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
> > +	if (IS_ERR(rtc->rtc)) {
> > +		err = PTR_ERR(rtc->rtc);
> > +		dev_err(dev, "RTC device register: err %d\n", err);
> > +		return err;
> > +	}
> > +
> > +	rtc->rtc->ops = &rc5t619_rtc_ops;
> > +	rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_1900;
> > +	rtc->rtc->range_max = RTC_TIMESTAMP_END_2099;
> > +
> > +	/* set interrupt and enable it */
> > +	if (rtc->irq != -1) {
> > +		err = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
> > +						rc5t619_rtc_irq,
> > +						IRQF_ONESHOT,
> > +						"rtc-rc5t619",
> > +						&pdev->dev);
> > +		if (err < 0) {
> > +			dev_err(&pdev->dev, "request IRQ:%d fail\n", rtc->irq);
> > +			rtc->irq = -1;
> > +
> > +			err = rc5t619_rtc_alarm_enable(&pdev->dev, 0);
> > +			if (err)
> > +				return err;
> > +
> > +		} else {
> > +			/* enable wake */
> > +			device_init_wakeup(&pdev->dev, 1);
> > +			enable_irq_wake(rtc->irq);
> > +		}
> > +	} else {
> > +		/* system don't want to using alarm interrupt, so close it */
> > +		err = rc5t619_rtc_alarm_enable(&pdev->dev, 0);
> > +		if (err)
> > +			return err;
> > +
> > +		dev_warn(&pdev->dev, "rc5t619 interrupt is disabled\n");
> > +	}
> > +
> > +	return rtc_register_device(rtc->rtc);
> > +}
> > +
> > +static struct platform_driver rc5t619_rtc_driver = {
> > +	.driver	= {
> > +		.name	= "rc5t619-rtc",
> > +	},
> > +	.probe	= rc5t619_rtc_probe,
> > +};
> > +
> > +module_platform_driver(rc5t619_rtc_driver);
> > +MODULE_ALIAS("platform:rc5t619-rtc");
> > +MODULE_DESCRIPTION("RICOH RC5T619 RTC driver");
> > +MODULE_LICENSE("GPL");
> > -- 
> > 2.20.1
> >   
> 
> -- 
> Alexandre Belloni, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
> 

Re: [PATCH v3 6/6] rtc: rtc-rc5t619: add ricoh rc5t619 RTC driver

[Alexandre Belloni]

On 11/12/2019 20:33:21+0100, Andreas Kemnade wrote:
> Hi,
> 
> On Mon, 2 Dec 2019 10:39:35 +0100
> Alexandre Belloni <alexandre.belloni@bootlin.com> wrote:
> 
> > On 29/11/2019 22:20:45+0100, Andreas Kemnade wrote:
> > > Add an RTC driver for the RTC device on Ricoh MFD rc5t619,
> > > which is implemented as a variant of rn5t618.
> > >
> will capitalize chip names in the commit text as requested for the other 
> patches by Lee.
>  
> > > rtc-range output:
> > > Testing 2000-02-28 23:59:59.
> > > OK
> > > 
> > > Testing 2038-01-19 03:14:07.
> > > OK
> > > 
> > > Testing 2069-12-31 23:59:59.
> > > OK
> > > 
> > > Testing 2099-12-31 23:59:59.
> > > KO RTC_RD_TIME returned 22 (line 138)
> > > 
> > > Testing 2100-02-28 23:59:59.
> > > KO RTC_SET_TIME returned 34 (line 122)
> > > 
> > > Testing 2106-02-07 06:28:15.
> > > KO RTC_SET_TIME returned 34 (line 122)
> > > 
> > > Testing 2262-04-11 23:47:16.
> > > KO RTC_SET_TIME returned 34 (line 122)
> > > 
> > > Signed-off-by: Andreas Kemnade <andreas@kemnade.info>  
> > Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
> >
> I will remove
> static int rc5t619_rtc_alarm_is_enabled(struct device *dev,  uint8_t *enabled)
> 
> since it is unused now so gcc emits a warning, which I have overlooked.
> I hope your Acked-by still counts for that.
> 

Sure, you can keep it.

While at it, the subject should be:

rtc: rc5t619: add ricoh rc5t619 RTC driver

If you want, you can capitalize the second rc5t619 but not the first
one.


-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com