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* [PATCH v3 0/4] Support ROHM BD9576MUF and BD9573MUF PMICs
@ 2020-09-29  8:14 Matti Vaittinen
  2020-09-29  8:15 ` [PATCH v3 1/4] dt_bindings: mfd: Add " Matti Vaittinen
                   ` (3 more replies)
  0 siblings, 4 replies; 7+ messages in thread
From: Matti Vaittinen @ 2020-09-29  8:14 UTC (permalink / raw)
  To: mazziesaccount, matti.vaittinen
  Cc: Lee Jones, Rob Herring, Liam Girdwood, Mark Brown,
	Matti Vaittinen, Wim Van Sebroeck, Guenter Roeck, devicetree,
	linux-kernel, linux-power, linux-watchdog

Initial support for ROHM BD9576MUF and BD9573MUF PMICs.

These PMICs are primarily intended to be used to power the R-Car family
processors. BD9576MUF includes some additional safety features the
BD9573MUF does not have. This initial version of drivers does not
utilize these features and for now the SW behaviour is identical.

This patch series includes MFD and watchdog drivers. Regulator part was
already applied.

- Enabling and pinging the watchdog
- configuring watchog timeout / window from device-tree

This patch series does not bring interrupt support. BD9576MUF and BD9573MUF
are designed to keep the IRQ line low for whole duration of error
condition. IRQ can't be 'acked'. So proper IRQ support would require
some IRQ limiter implementation (delayed unmask?) in order to not hog
the CPU.

Changelog v3:
  - use only one binding to specify watchdog time-out window.

Changelog v2:
  - dropped already applied regulator part
  - dt_bindings: Fix case for regulator-names in the example
  - watchdod: unify probe error check and revise includes

---

Matti Vaittinen (4):
  dt_bindings: mfd: Add ROHM BD9576MUF and BD9573MUF PMICs
  mfd: Support ROHM BD9576MUF and BD9573MUF
  wdt: Support wdt on ROHM BD9576MUF and BD9573MUF
  MAINTAINERS: Add ROHM BD9576MUF and BD9573MUF drivers

 .../bindings/mfd/rohm,bd9576-pmic.yaml        | 123 ++++++++
 MAINTAINERS                                   |   4 +
 drivers/mfd/Kconfig                           |  11 +
 drivers/mfd/Makefile                          |   1 +
 drivers/mfd/rohm-bd9576.c                     | 130 ++++++++
 drivers/watchdog/Kconfig                      |  13 +
 drivers/watchdog/Makefile                     |   1 +
 drivers/watchdog/bd9576_wdt.c                 | 290 ++++++++++++++++++
 include/linux/mfd/rohm-bd957x.h               |  59 ++++
 include/linux/mfd/rohm-generic.h              |   2 +
 10 files changed, 634 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/rohm,bd9576-pmic.yaml
 create mode 100644 drivers/mfd/rohm-bd9576.c
 create mode 100644 drivers/watchdog/bd9576_wdt.c
 create mode 100644 include/linux/mfd/rohm-bd957x.h


base-commit: f4d51dffc6c01a9e94650d95ce0104964f8ae822
-- 
2.21.0


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

^ permalink raw reply	[flat|nested] 7+ messages in thread

* [PATCH v3 1/4] dt_bindings: mfd: Add ROHM BD9576MUF and BD9573MUF PMICs
  2020-09-29  8:14 [PATCH v3 0/4] Support ROHM BD9576MUF and BD9573MUF PMICs Matti Vaittinen
@ 2020-09-29  8:15 ` Matti Vaittinen
  2020-09-29 14:53   ` Rob Herring
  2020-09-29  8:16 ` [PATCH v3 2/4] mfd: Support ROHM BD9576MUF and BD9573MUF Matti Vaittinen
                   ` (2 subsequent siblings)
  3 siblings, 1 reply; 7+ messages in thread
From: Matti Vaittinen @ 2020-09-29  8:15 UTC (permalink / raw)
  To: mazziesaccount, matti.vaittinen
  Cc: Lee Jones, Rob Herring, Matti Vaittinen, Wim Van Sebroeck,
	Guenter Roeck, devicetree, linux-kernel, linux-power,
	linux-watchdog

Add bindings for ROHM BD9576MUF and BD9573MUF PMICs. These
PMICs are primarily intended to be used to power the R-Car series
processors. They provide 6 power outputs, safety features and a
watchdog with two functional modes.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---

Changes from v2:
  - Replace bindings hw_margin_ms and rohm,hw-margin-min-ms with
    rohm,hw-timeout-ms

 .../bindings/mfd/rohm,bd9576-pmic.yaml        | 123 ++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/rohm,bd9576-pmic.yaml

diff --git a/Documentation/devicetree/bindings/mfd/rohm,bd9576-pmic.yaml b/Documentation/devicetree/bindings/mfd/rohm,bd9576-pmic.yaml
new file mode 100644
index 000000000000..1e468a29ec3b
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/rohm,bd9576-pmic.yaml
@@ -0,0 +1,123 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/rohm,bd9576-pmic.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ROHM BD9576MUF and BD9573MUF Power Management Integrated Circuit bindings
+
+maintainers:
+  - Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
+
+description: |
+  BD9576MUF and BD9573MUF are power management ICs primarily intended for
+  powering the R-Car series processors.
+  The IC provides 6 power outputs with configurable sequencing and safety
+  monitoring. A watchdog logic with slow ping/windowed modes is also included.
+
+properties:
+  compatible:
+    enum:
+      - rohm,bd9576
+      - rohm,bd9573
+
+  reg:
+    description:
+      I2C slave address.
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  rohm,vout1-en-low:
+    description:
+      BD9576 and BD9573 VOUT1 regulator enable state can be individually
+      controlled by a GPIO. This is dictated by state of vout1-en pin during
+      the PMIC startup. If vout1-en is LOW during PMIC startup then the VOUT1
+      enable sate is controlled via this pin. Set this property if vout1-en
+      is wired to be down at PMIC start-up.
+    type: boolean
+
+  rohm,vout1-en-gpios:
+    description:
+      GPIO specifier to specify the GPIO connected to vout1-en for vout1 ON/OFF
+      state control.
+    maxItems: 1
+
+  rohm,ddr-sel-low:
+    description:
+      The BD9576 and BD9573 output voltage for DDR can be selected by setting
+      the ddr-sel pin low or high. Set this property if ddr-sel is grounded.
+    type: boolean
+
+  rohm,watchdog-enable-gpios:
+    description: The GPIO line used to enable the watchdog.
+    maxItems: 1
+
+  rohm,watchdog-ping-gpios:
+    description: The GPIO line used to ping the watchdog.
+    maxItems: 1
+
+  rohm,hw-timeout-ms:
+    maxItems: 2
+    description:
+      Watchog timeout in milliseconds. If single value is given it is
+      the maximum timeout. Eg. if pinging watchdog is not done within this time
+      limit the watchdog will be triggered. If two values are given watchdog
+      is configured in "window mode". Then first value is limit for short-ping
+      Eg. if watchdog is pinged sooner than that the watchdog will trigger.
+      When two values is given the second value is the maximum timeout.
+      # (HW) minimum for short timeout is 2ms, maximum 220 ms.
+      # (HW) minimum for max timeout is 4ms, maximum maximum 4416 ms.
+
+  regulators:
+    $ref: ../regulator/rohm,bd9576-regulator.yaml
+    description:
+      List of child nodes that specify the regulators.
+
+required:
+  - compatible
+  - reg
+  - regulators
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/leds/common.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        pmic: pmic@30 {
+            compatible = "rohm,bd9576";
+            reg = <0x30>;
+            rohm,vout1-en-low;
+            rohm,vout1-en-gpios = <&gpio2 6 GPIO_ACTIVE_HIGH>;
+            rohm,ddr-sel-low;
+            rohm,watchdog-enable-gpios = <&gpio2 6 GPIO_ACTIVE_HIGH>;
+            rohm,watchdog-ping-gpios = <&gpio2 7 GPIO_ACTIVE_HIGH>;
+            rohm,hw-timeout-ms = <150>, <2300>;
+
+            regulators {
+                boost1: regulator-vd50 {
+                    regulator-name = "VD50";
+                };
+                buck1: regulator-vd18 {
+                    regulator-name = "VD18";
+                };
+                buck2: regulator-vdddr {
+                    regulator-name = "VDDDR";
+                };
+                buck3: regulator-vd10 {
+                    regulator-name = "VD10";
+                };
+                ldo: regulator-voutl1 {
+                    regulator-name = "VOUTL1";
+                };
+                sw: regulator-vouts1 {
+                    regulator-name = "VOUTS1";
+                };
+            };
+        };
+    };
-- 
2.21.0


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

^ permalink raw reply	[flat|nested] 7+ messages in thread

* [PATCH v3 2/4] mfd: Support ROHM BD9576MUF and BD9573MUF
  2020-09-29  8:14 [PATCH v3 0/4] Support ROHM BD9576MUF and BD9573MUF PMICs Matti Vaittinen
  2020-09-29  8:15 ` [PATCH v3 1/4] dt_bindings: mfd: Add " Matti Vaittinen
@ 2020-09-29  8:16 ` Matti Vaittinen
  2020-09-29  8:17 ` [PATCH v3 3/4] wdt: Support wdt on " Matti Vaittinen
  2020-09-29  8:17 ` [PATCH v3 4/4] MAINTAINERS: Add ROHM BD9576MUF and BD9573MUF drivers Matti Vaittinen
  3 siblings, 0 replies; 7+ messages in thread
From: Matti Vaittinen @ 2020-09-29  8:16 UTC (permalink / raw)
  To: mazziesaccount, matti.vaittinen
  Cc: Lee Jones, Rob Herring, Matti Vaittinen, Wim Van Sebroeck,
	Guenter Roeck, devicetree, linux-kernel, linux-power,
	linux-watchdog

Add core support for ROHM BD9576MUF and BD9573MUF PMICs which are
mainly used to power the R-Car series processors.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
 drivers/mfd/Kconfig              |  11 +++
 drivers/mfd/Makefile             |   1 +
 drivers/mfd/rohm-bd9576.c        | 130 +++++++++++++++++++++++++++++++
 include/linux/mfd/rohm-bd957x.h  |  59 ++++++++++++++
 include/linux/mfd/rohm-generic.h |   2 +
 5 files changed, 203 insertions(+)
 create mode 100644 drivers/mfd/rohm-bd9576.c
 create mode 100644 include/linux/mfd/rohm-bd957x.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 33df0837ab41..e8275526818a 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1975,6 +1975,17 @@ config MFD_ROHM_BD71828
 	  Also included is a Coulomb counter, a real-time clock (RTC), and
 	  a 32.768 kHz clock gate.
 
+config MFD_ROHM_BD957XMUF
+	tristate "ROHM BD9576MUF and BD9573MUF Power Management ICs"
+	depends on I2C=y
+	depends on OF
+	select REGMAP_I2C
+	select MFD_CORE
+	help
+	  Select this option to get support for the ROHM BD9576MUF and
+	  BD9573MUF Power Management ICs. BD9576 and BD9573 are primarily
+	  designed to be used to power R-Car series processors.
+
 config MFD_STM32_LPTIMER
 	tristate "Support for STM32 Low-Power Timer"
 	depends on (ARCH_STM32 && OF) || COMPILE_TEST
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index a60e5f835283..6ad33ccb35f0 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -260,6 +260,7 @@ obj-$(CONFIG_RAVE_SP_CORE)	+= rave-sp.o
 obj-$(CONFIG_MFD_ROHM_BD70528)	+= rohm-bd70528.o
 obj-$(CONFIG_MFD_ROHM_BD71828)	+= rohm-bd71828.o
 obj-$(CONFIG_MFD_ROHM_BD718XX)	+= rohm-bd718x7.o
+obj-$(CONFIG_MFD_ROHM_BD957XMUF)	+= rohm-bd9576.o
 obj-$(CONFIG_MFD_STMFX) 	+= stmfx.o
 obj-$(CONFIG_MFD_KHADAS_MCU) 	+= khadas-mcu.o
 
diff --git a/drivers/mfd/rohm-bd9576.c b/drivers/mfd/rohm-bd9576.c
new file mode 100644
index 000000000000..a23ded510209
--- /dev/null
+++ b/drivers/mfd/rohm-bd9576.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+//
+// Copyright (C) 2020 ROHM Semiconductors
+//
+// ROHM BD9576MUF and BD9573MUF PMIC driver
+
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/rohm-bd957x.h>
+#include <linux/mfd/rohm-generic.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+
+static struct mfd_cell bd9573_mfd_cells[] = {
+	{ .name = "bd9573-pmic", },
+	{ .name = "bd9576-wdt", },
+};
+
+
+static struct mfd_cell bd9576_mfd_cells[] = {
+	{ .name = "bd9576-pmic", },
+	{ .name = "bd9576-wdt", },
+};
+
+static const struct regmap_range volatile_ranges[] = {
+	{
+		.range_min = BD957X_REG_SMRB_ASSERT,
+		.range_max = BD957X_REG_SMRB_ASSERT,
+	},
+	{
+		.range_min = BD957X_REG_PMIC_INTERNAL_STAT,
+		.range_max = BD957X_REG_PMIC_INTERNAL_STAT,
+	},
+	{
+		.range_min = BD957X_REG_INT_THERM_STAT,
+		.range_max = BD957X_REG_INT_THERM_STAT,
+	},
+	{
+		.range_min = BD957X_REG_INT_OVP_STAT,
+		.range_max = BD957X_REG_INT_SYS_STAT,
+	}, {
+		.range_min = BD957X_REG_INT_MAIN_STAT,
+		.range_max = BD957X_REG_INT_MAIN_STAT,
+	},
+};
+
+static const struct regmap_access_table volatile_regs = {
+	.yes_ranges = &volatile_ranges[0],
+	.n_yes_ranges = ARRAY_SIZE(volatile_ranges),
+};
+
+static struct regmap_config bd957x_regmap = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.volatile_table = &volatile_regs,
+	.max_register = BD957X_MAX_REGISTER,
+	.cache_type = REGCACHE_RBTREE,
+};
+
+static int bd957x_i2c_probe(struct i2c_client *i2c,
+			     const struct i2c_device_id *id)
+{
+	int ret;
+	struct regmap *regmap;
+	struct mfd_cell *mfd;
+	int cells;
+	unsigned int chip_type;
+
+	chip_type = (unsigned int)(uintptr_t)
+		    of_device_get_match_data(&i2c->dev);
+
+	switch (chip_type) {
+	case ROHM_CHIP_TYPE_BD9576:
+		mfd = bd9576_mfd_cells;
+		cells = ARRAY_SIZE(bd9576_mfd_cells);
+		break;
+	case ROHM_CHIP_TYPE_BD9573:
+		mfd = bd9573_mfd_cells;
+		cells = ARRAY_SIZE(bd9573_mfd_cells);
+		break;
+	default:
+		dev_err(&i2c->dev, "Unknown device type");
+		return -EINVAL;
+	}
+
+	regmap = devm_regmap_init_i2c(i2c, &bd957x_regmap);
+	if (IS_ERR(regmap)) {
+		dev_err(&i2c->dev, "Failed to initialize Regmap\n");
+		return PTR_ERR(regmap);
+	}
+
+	ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, mfd, cells,
+				   NULL, 0, NULL);
+	if (ret)
+		dev_err(&i2c->dev, "Failed to create subdevices\n");
+
+	return ret;
+}
+
+static const struct of_device_id bd957x_of_match[] = {
+	{
+		.compatible = "rohm,bd9576",
+		.data = (void *)ROHM_CHIP_TYPE_BD9576,
+	},
+	{
+		.compatible = "rohm,bd9573",
+		.data = (void *)ROHM_CHIP_TYPE_BD9573,
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, bd957x_of_match);
+
+static struct i2c_driver bd957x_drv = {
+	.driver = {
+		.name = "rohm-bd957x",
+		.of_match_table = bd957x_of_match,
+	},
+	.probe = &bd957x_i2c_probe,
+};
+
+module_i2c_driver(bd957x_drv);
+
+MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
+MODULE_DESCRIPTION("ROHM BD9576MUF and BD9573MUF Power Management IC driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/rohm-bd957x.h b/include/linux/mfd/rohm-bd957x.h
new file mode 100644
index 000000000000..3e7ca6fe5d4f
--- /dev/null
+++ b/include/linux/mfd/rohm-bd957x.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (C) 2020 ROHM Semiconductors */
+
+#ifndef __LINUX_MFD_BD957X_H__
+#define __LINUX_MFD_BD957X_H__
+
+enum {
+	BD957X_VD50,
+	BD957X_VD18,
+	BD957X_VDDDR,
+	BD957X_VD10,
+	BD957X_VOUTL1,
+	BD957X_VOUTS1,
+};
+
+#define BD957X_REG_SMRB_ASSERT		0x15
+#define BD957X_REG_PMIC_INTERNAL_STAT	0x20
+#define BD957X_REG_INT_THERM_STAT	0x23
+#define BD957X_REG_INT_THERM_MASK 0x24
+#define BD957X_REG_INT_OVP_STAT 0x25
+#define BD957X_REG_INT_SCP_STAT 0x26
+#define BD957X_REG_INT_OCP_STAT 0x27
+#define BD957X_REG_INT_OVD_STAT 0x28
+#define BD957X_REG_INT_UVD_STAT 0x29
+#define BD957X_REG_INT_UVP_STAT 0x2a
+#define BD957X_REG_INT_SYS_STAT 0x2b
+#define BD957X_REG_INT_SYS_MASK 0x2c
+#define BD957X_REG_INT_MAIN_STAT 0x30
+#define BD957X_REG_INT_MAIN_MASK 0x31
+
+#define BD957X_REG_WDT_CONF 0x16
+
+#define BD957X_REG_POW_TRIGGER1 0x41
+#define BD957X_REG_POW_TRIGGER2 0x42
+#define BD957X_REG_POW_TRIGGER3 0x43
+#define BD957X_REG_POW_TRIGGER4 0x44
+#define BD957X_REG_POW_TRIGGERL1 0x45
+#define BD957X_REG_POW_TRIGGERS1 0x46
+
+#define BD957X_REGULATOR_EN_MASK 0xff
+#define BD957X_REGULATOR_DIS_VAL 0xff
+
+#define BD957X_VSEL_REG_MASK	0xff
+
+#define BD957X_MASK_VOUT1_TUNE	0x87
+#define BD957X_MASK_VOUT2_TUNE	0x87
+#define BD957X_MASK_VOUT3_TUNE	0x1f
+#define BD957X_MASK_VOUT4_TUNE	0x1f
+#define BD957X_MASK_VOUTL1_TUNE	0x87
+
+#define BD957X_REG_VOUT1_TUNE	0x50
+#define BD957X_REG_VOUT2_TUNE	0x53
+#define BD957X_REG_VOUT3_TUNE	0x56
+#define BD957X_REG_VOUT4_TUNE	0x59
+#define BD957X_REG_VOUTL1_TUNE	0x5c
+
+#define BD957X_MAX_REGISTER 0x61
+
+#endif
diff --git a/include/linux/mfd/rohm-generic.h b/include/linux/mfd/rohm-generic.h
index 4283b5b33e04..58b4f1a0f4af 100644
--- a/include/linux/mfd/rohm-generic.h
+++ b/include/linux/mfd/rohm-generic.h
@@ -12,6 +12,8 @@ enum rohm_chip_type {
 	ROHM_CHIP_TYPE_BD71847,
 	ROHM_CHIP_TYPE_BD70528,
 	ROHM_CHIP_TYPE_BD71828,
+	ROHM_CHIP_TYPE_BD9576,
+	ROHM_CHIP_TYPE_BD9573,
 	ROHM_CHIP_TYPE_AMOUNT
 };
 
-- 
2.21.0


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

^ permalink raw reply	[flat|nested] 7+ messages in thread

* [PATCH v3 3/4] wdt: Support wdt on ROHM BD9576MUF and BD9573MUF
  2020-09-29  8:14 [PATCH v3 0/4] Support ROHM BD9576MUF and BD9573MUF PMICs Matti Vaittinen
  2020-09-29  8:15 ` [PATCH v3 1/4] dt_bindings: mfd: Add " Matti Vaittinen
  2020-09-29  8:16 ` [PATCH v3 2/4] mfd: Support ROHM BD9576MUF and BD9573MUF Matti Vaittinen
@ 2020-09-29  8:17 ` Matti Vaittinen
  2020-10-01 15:30   ` Guenter Roeck
  2020-09-29  8:17 ` [PATCH v3 4/4] MAINTAINERS: Add ROHM BD9576MUF and BD9573MUF drivers Matti Vaittinen
  3 siblings, 1 reply; 7+ messages in thread
From: Matti Vaittinen @ 2020-09-29  8:17 UTC (permalink / raw)
  To: mazziesaccount, matti.vaittinen
  Cc: Lee Jones, Rob Herring, Matti Vaittinen, Wim Van Sebroeck,
	Guenter Roeck, devicetree, linux-kernel, linux-power,
	linux-watchdog

Add Watchdog support for ROHM BD9576MUF and BD9573MUF PMICs which are
mainly used to power the R-Car series processors. The watchdog is
pinged using a GPIO and enabled using another GPIO. Additionally
watchdog time-out can be configured to HW prior starting the watchdog.
Watchdog timeout can be configured to detect only delayed ping or in
a window mode where also too fast pings are detected.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---

Changes from v2:
  - Replace bindings hw_margin_ms and rohm,hw-margin-min-ms with
    rohm,hw-timeout-ms

 drivers/watchdog/Kconfig      |  13 ++
 drivers/watchdog/Makefile     |   1 +
 drivers/watchdog/bd9576_wdt.c | 290 ++++++++++++++++++++++++++++++++++
 3 files changed, 304 insertions(+)
 create mode 100644 drivers/watchdog/bd9576_wdt.c

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index ab7aad5a1e69..d042a517a946 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -172,6 +172,19 @@ config BD70528_WATCHDOG
 	  Alternatively say M to compile the driver as a module,
 	  which will be called bd70528_wdt.
 
+config BD957XMUF_WATCHDOG
+	tristate "ROHM BD9576MUF and BD9573MUF PMIC Watchdog"
+	depends on MFD_ROHM_BD957XMUF
+	select WATCHDOG_CORE
+	help
+	  Support for the watchdog in the ROHM BD9576 and BD9573 PMICs.
+	  These PMIC ICs contain watchdog block which can be configured
+	  to toggle reset line if SoC fails to ping watchdog via GPIO.
+
+	  Say Y here to include support for the ROHM BD9576 or BD9573
+	  watchdog. Alternatively say M to compile the driver as a module,
+	  which will be called bd9576_wdt.
+
 config DA9052_WATCHDOG
 	tristate "Dialog DA9052 Watchdog"
 	depends on PMIC_DA9052 || COMPILE_TEST
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 97bed1d3d97c..14d75f98e3df 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -208,6 +208,7 @@ obj-$(CONFIG_XEN_WDT) += xen_wdt.o
 
 # Architecture Independent
 obj-$(CONFIG_BD70528_WATCHDOG) += bd70528_wdt.o
+obj-$(CONFIG_BD957XMUF_WATCHDOG) += bd9576_wdt.o
 obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o
 obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o
 obj-$(CONFIG_DA9062_WATCHDOG) += da9062_wdt.o
diff --git a/drivers/watchdog/bd9576_wdt.c b/drivers/watchdog/bd9576_wdt.c
new file mode 100644
index 000000000000..afef19ce01be
--- /dev/null
+++ b/drivers/watchdog/bd9576_wdt.c
@@ -0,0 +1,290 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2020 ROHM Semiconductors
+ *
+ * ROHM BD9576MUF and BD9573MUF Watchdog driver
+ */
+
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mfd/rohm-bd957x.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/watchdog.h>
+
+static bool nowayout;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+		"Watchdog cannot be stopped once started (default=\"false\")");
+
+#define HW_MARGIN_MIN 2
+#define HW_MARGIN_MAX 4416
+#define BD957X_WDT_DEFAULT_MARGIN 4416
+
+struct bd9576_wdt_priv {
+	struct gpio_desc	*gpiod_ping;
+	struct gpio_desc	*gpiod_en;
+	struct device		*dev;
+	struct regmap		*regmap;
+	bool			always_running;
+	struct watchdog_device	wdd;
+};
+
+static void bd9576_wdt_disable(struct bd9576_wdt_priv *priv)
+{
+	gpiod_set_value_cansleep(priv->gpiod_en, 0);
+}
+
+static int bd9576_wdt_ping(struct watchdog_device *wdd)
+{
+	struct bd9576_wdt_priv *priv = watchdog_get_drvdata(wdd);
+
+	/* Pulse */
+	gpiod_set_value_cansleep(priv->gpiod_ping, 1);
+	gpiod_set_value_cansleep(priv->gpiod_ping, 0);
+
+	return 0;
+}
+
+static int bd9576_wdt_start(struct watchdog_device *wdd)
+{
+	struct bd9576_wdt_priv *priv = watchdog_get_drvdata(wdd);
+
+	gpiod_set_value_cansleep(priv->gpiod_en, 1);
+
+	return bd9576_wdt_ping(wdd);
+}
+
+static int bd9576_wdt_stop(struct watchdog_device *wdd)
+{
+	struct bd9576_wdt_priv *priv = watchdog_get_drvdata(wdd);
+
+	if (!priv->always_running)
+		bd9576_wdt_disable(priv);
+	else
+		set_bit(WDOG_HW_RUNNING, &wdd->status);
+
+	return 0;
+}
+
+static const struct watchdog_info bd957x_wdt_ident = {
+	.options	= WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING |
+			  WDIOF_SETTIMEOUT,
+	.identity	= "BD957x Watchdog",
+};
+
+static const struct watchdog_ops bd957x_wdt_ops = {
+	.owner		= THIS_MODULE,
+	.start		= bd9576_wdt_start,
+	.stop		= bd9576_wdt_stop,
+	.ping		= bd9576_wdt_ping,
+};
+
+/* Unit is hundreds of uS */
+#define FASTNG_MIN 23
+
+static int find_closest_fast(int target, int *sel, int *val)
+{
+	int i;
+	int window = FASTNG_MIN;
+
+	for (i = 0; i < 8 && window < target; i++)
+		window <<= 1;
+
+	*val = window;
+	*sel = i;
+
+	if (i == 8)
+		return -EINVAL;
+
+	return 0;
+
+}
+
+static int find_closest_slow_by_fast(int fast_val, int target, int *slowsel)
+{
+	int sel;
+	static const int multipliers[] = {2, 3, 7, 15};
+
+	for (sel = 0; sel < ARRAY_SIZE(multipliers) &&
+	     multipliers[sel] * fast_val < target; sel++)
+		;
+
+	if (sel == ARRAY_SIZE(multipliers))
+		return -EINVAL;
+
+	*slowsel = sel;
+
+	return 0;
+}
+
+static int find_closest_slow(int target, int *slow_sel, int *fast_sel)
+{
+	static const int multipliers[] = {2, 3, 7, 15};
+	int i, j;
+	int val = 0;
+	int window = FASTNG_MIN;
+
+	for (i = 0; i < 8; i++) {
+		for (j = 0; j < ARRAY_SIZE(multipliers); j++) {
+			int slow;
+
+			slow = window * multipliers[j];
+			if (slow >= target && (!val || slow < val)) {
+				val = slow;
+				*fast_sel = i;
+				*slow_sel = j;
+			}
+		}
+		window <<= 1;
+	}
+	if (!val)
+		return -EINVAL;
+
+	return 0;
+}
+
+#define BD957X_WDG_TYPE_WINDOW BIT(5)
+#define BD957X_WDG_TYPE_SLOW 0
+#define BD957X_WDG_TYPE_MASK BIT(5)
+#define BD957X_WDG_NG_RATIO_MASK 0x18
+#define BD957X_WDG_FASTNG_MASK 0x7
+
+static int bd957x_set_wdt_mode(struct bd9576_wdt_priv *priv, int hw_margin,
+			       int hw_margin_min)
+{
+	int ret, fastng, slowng, type, reg, mask;
+	struct device *dev = priv->dev;
+
+	/* convert to 100uS */
+	hw_margin *= 10;
+	hw_margin_min *= 10;
+	if (hw_margin_min) {
+		int min;
+
+		type = BD957X_WDG_TYPE_WINDOW;
+		dev_dbg(dev, "Setting type WINDOW 0x%x\n", type);
+		ret = find_closest_fast(hw_margin_min, &fastng, &min);
+		if (ret) {
+			dev_err(dev, "bad WDT window for fast timeout\n");
+			return ret;
+		}
+
+		ret = find_closest_slow_by_fast(min, hw_margin, &slowng);
+		if (ret) {
+			dev_err(dev, "bad WDT window\n");
+			return ret;
+		}
+
+	} else {
+		type = BD957X_WDG_TYPE_SLOW;
+		dev_dbg(dev, "Setting type SLOW 0x%x\n", type);
+		ret = find_closest_slow(hw_margin, &slowng, &fastng);
+		if (ret) {
+			dev_err(dev, "bad WDT window\n");
+			return ret;
+		}
+	}
+
+	slowng <<= ffs(BD957X_WDG_NG_RATIO_MASK) - 1;
+	reg = type | slowng | fastng;
+	mask = BD957X_WDG_TYPE_MASK | BD957X_WDG_NG_RATIO_MASK |
+	       BD957X_WDG_FASTNG_MASK;
+	ret = regmap_update_bits(priv->regmap, BD957X_REG_WDT_CONF,
+				 mask, reg);
+
+	return ret;
+}
+
+static int bd9576_wdt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->parent->of_node;
+	struct bd9576_wdt_priv *priv;
+	u32 hw_margin[2];
+	u32 hw_margin_max = BD957X_WDT_DEFAULT_MARGIN, hw_margin_min = 0;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+
+	priv->dev = dev;
+	priv->regmap = dev_get_regmap(dev->parent, NULL);
+	if (!priv->regmap) {
+		dev_err(dev, "No regmap found\n");
+		return -ENODEV;
+	}
+
+	priv->gpiod_en = devm_gpiod_get_from_of_node(dev, dev->parent->of_node,
+						     "rohm,watchdog-enable-gpios",
+						     0, GPIOD_OUT_LOW,
+						     "watchdog-enable");
+	if (IS_ERR(priv->gpiod_en))
+		return dev_err_probe(dev, PTR_ERR(priv->gpiod_en),
+			      "getting watchdog-enable GPIO failed\n");
+
+	priv->gpiod_ping = devm_gpiod_get_from_of_node(dev, dev->parent->of_node,
+						     "rohm,watchdog-ping-gpios",
+						     0, GPIOD_OUT_LOW,
+						     "watchdog-ping");
+	if (IS_ERR(priv->gpiod_ping))
+		return dev_err_probe(dev, PTR_ERR(priv->gpiod_ping),
+				     "getting watchdog-ping GPIO failed\n");
+
+	ret = of_property_read_variable_u32_array(np, "rohm,hw-timeout-ms",
+						  &hw_margin[0], 1, 2);
+	if (ret < 0 && ret != -EINVAL)
+		return ret;
+
+	if (ret == 1)
+		hw_margin_max = hw_margin[0];
+
+	if (ret == 2) {
+		hw_margin_max = hw_margin[1];
+		hw_margin_min = hw_margin[0];
+	}
+
+	ret = bd957x_set_wdt_mode(priv, hw_margin_max, hw_margin_min);
+	if (ret)
+		return ret;
+
+	priv->always_running = of_property_read_bool(np, "always-running");
+
+	watchdog_set_drvdata(&priv->wdd, priv);
+
+	priv->wdd.info			= &bd957x_wdt_ident;
+	priv->wdd.ops			= &bd957x_wdt_ops;
+	priv->wdd.min_hw_heartbeat_ms	= hw_margin_min;
+	priv->wdd.max_hw_heartbeat_ms	= hw_margin_max;
+	priv->wdd.parent		= dev;
+	priv->wdd.timeout		= (hw_margin_max / 2) * 1000;
+
+	watchdog_init_timeout(&priv->wdd, 0, dev);
+	watchdog_set_nowayout(&priv->wdd, nowayout);
+
+	watchdog_stop_on_reboot(&priv->wdd);
+
+	if (priv->always_running)
+		bd9576_wdt_start(&priv->wdd);
+
+	return devm_watchdog_register_device(dev, &priv->wdd);
+}
+
+static struct platform_driver bd9576_wdt_driver = {
+	.driver	= {
+		.name = "bd9576-wdt",
+	},
+	.probe	= bd9576_wdt_probe,
+};
+
+module_platform_driver(bd9576_wdt_driver);
+
+MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
+MODULE_DESCRIPTION("ROHM BD9576/BD9573 Watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:bd9576-wdt");
-- 
2.21.0


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

^ permalink raw reply	[flat|nested] 7+ messages in thread

* [PATCH v3 4/4] MAINTAINERS: Add ROHM BD9576MUF and BD9573MUF drivers
  2020-09-29  8:14 [PATCH v3 0/4] Support ROHM BD9576MUF and BD9573MUF PMICs Matti Vaittinen
                   ` (2 preceding siblings ...)
  2020-09-29  8:17 ` [PATCH v3 3/4] wdt: Support wdt on " Matti Vaittinen
@ 2020-09-29  8:17 ` Matti Vaittinen
  3 siblings, 0 replies; 7+ messages in thread
From: Matti Vaittinen @ 2020-09-29  8:17 UTC (permalink / raw)
  To: mazziesaccount, matti.vaittinen
  Cc: Lee Jones, Rob Herring, Liam Girdwood, Mark Brown,
	Matti Vaittinen, Wim Van Sebroeck, Guenter Roeck, devicetree,
	linux-kernel, linux-power, linux-watchdog

Add maintainer entries for ROHM BD9576MUF and ROHM BD9573MUF drivers.
MFD, regulator and watchdog drivers were introduced for these PMICs.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
 MAINTAINERS | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index b5cfab015bd6..630a23fc84f0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14956,16 +14956,20 @@ F:	drivers/gpio/gpio-bd71828.c
 F:	drivers/mfd/rohm-bd70528.c
 F:	drivers/mfd/rohm-bd71828.c
 F:	drivers/mfd/rohm-bd718x7.c
+F:	drivers/mfd/rohm-bd9576.c
 F:	drivers/power/supply/bd70528-charger.c
 F:	drivers/regulator/bd70528-regulator.c
 F:	drivers/regulator/bd71828-regulator.c
 F:	drivers/regulator/bd718x7-regulator.c
+F:	drivers/regulator/bd9576-regulator.c
 F:	drivers/regulator/rohm-regulator.c
 F:	drivers/rtc/rtc-bd70528.c
 F:	drivers/watchdog/bd70528_wdt.c
+F:	drivers/watchdog/bd9576_wdt.c
 F:	include/linux/mfd/rohm-bd70528.h
 F:	include/linux/mfd/rohm-bd71828.h
 F:	include/linux/mfd/rohm-bd718x7.h
+F:	include/linux/mfd/rohm-bd957x.h
 F:	include/linux/mfd/rohm-generic.h
 F:	include/linux/mfd/rohm-shared.h
 
-- 
2.21.0


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH v3 1/4] dt_bindings: mfd: Add ROHM BD9576MUF and BD9573MUF PMICs
  2020-09-29  8:15 ` [PATCH v3 1/4] dt_bindings: mfd: Add " Matti Vaittinen
@ 2020-09-29 14:53   ` Rob Herring
  0 siblings, 0 replies; 7+ messages in thread
From: Rob Herring @ 2020-09-29 14:53 UTC (permalink / raw)
  To: Matti Vaittinen
  Cc: devicetree, linux-power, Lee Jones, linux-kernel, linux-watchdog,
	mazziesaccount, Rob Herring, Guenter Roeck, Wim Van Sebroeck

On Tue, 29 Sep 2020 11:15:31 +0300, Matti Vaittinen wrote:
> Add bindings for ROHM BD9576MUF and BD9573MUF PMICs. These
> PMICs are primarily intended to be used to power the R-Car series
> processors. They provide 6 power outputs, safety features and a
> watchdog with two functional modes.
> 
> Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
> ---
> 
> Changes from v2:
>   - Replace bindings hw_margin_ms and rohm,hw-margin-min-ms with
>     rohm,hw-timeout-ms
> 
>  .../bindings/mfd/rohm,bd9576-pmic.yaml        | 123 ++++++++++++++++++
>  1 file changed, 123 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/rohm,bd9576-pmic.yaml
> 

Reviewed-by: Rob Herring <robh@kernel.org>

^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH v3 3/4] wdt: Support wdt on ROHM BD9576MUF and BD9573MUF
  2020-09-29  8:17 ` [PATCH v3 3/4] wdt: Support wdt on " Matti Vaittinen
@ 2020-10-01 15:30   ` Guenter Roeck
  0 siblings, 0 replies; 7+ messages in thread
From: Guenter Roeck @ 2020-10-01 15:30 UTC (permalink / raw)
  To: Matti Vaittinen
  Cc: mazziesaccount, Lee Jones, Rob Herring, Wim Van Sebroeck,
	devicetree, linux-kernel, linux-power, linux-watchdog

On Tue, Sep 29, 2020 at 11:17:07AM +0300, Matti Vaittinen wrote:
> Add Watchdog support for ROHM BD9576MUF and BD9573MUF PMICs which are
> mainly used to power the R-Car series processors. The watchdog is
> pinged using a GPIO and enabled using another GPIO. Additionally
> watchdog time-out can be configured to HW prior starting the watchdog.
> Watchdog timeout can be configured to detect only delayed ping or in
> a window mode where also too fast pings are detected.
> 
> Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
> 
> Changes from v2:
>   - Replace bindings hw_margin_ms and rohm,hw-margin-min-ms with
>     rohm,hw-timeout-ms
> 
>  drivers/watchdog/Kconfig      |  13 ++
>  drivers/watchdog/Makefile     |   1 +
>  drivers/watchdog/bd9576_wdt.c | 290 ++++++++++++++++++++++++++++++++++
>  3 files changed, 304 insertions(+)
>  create mode 100644 drivers/watchdog/bd9576_wdt.c
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index ab7aad5a1e69..d042a517a946 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -172,6 +172,19 @@ config BD70528_WATCHDOG
>  	  Alternatively say M to compile the driver as a module,
>  	  which will be called bd70528_wdt.
>  
> +config BD957XMUF_WATCHDOG
> +	tristate "ROHM BD9576MUF and BD9573MUF PMIC Watchdog"
> +	depends on MFD_ROHM_BD957XMUF
> +	select WATCHDOG_CORE
> +	help
> +	  Support for the watchdog in the ROHM BD9576 and BD9573 PMICs.
> +	  These PMIC ICs contain watchdog block which can be configured
> +	  to toggle reset line if SoC fails to ping watchdog via GPIO.
> +
> +	  Say Y here to include support for the ROHM BD9576 or BD9573
> +	  watchdog. Alternatively say M to compile the driver as a module,
> +	  which will be called bd9576_wdt.
> +
>  config DA9052_WATCHDOG
>  	tristate "Dialog DA9052 Watchdog"
>  	depends on PMIC_DA9052 || COMPILE_TEST
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 97bed1d3d97c..14d75f98e3df 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -208,6 +208,7 @@ obj-$(CONFIG_XEN_WDT) += xen_wdt.o
>  
>  # Architecture Independent
>  obj-$(CONFIG_BD70528_WATCHDOG) += bd70528_wdt.o
> +obj-$(CONFIG_BD957XMUF_WATCHDOG) += bd9576_wdt.o
>  obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o
>  obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o
>  obj-$(CONFIG_DA9062_WATCHDOG) += da9062_wdt.o
> diff --git a/drivers/watchdog/bd9576_wdt.c b/drivers/watchdog/bd9576_wdt.c
> new file mode 100644
> index 000000000000..afef19ce01be
> --- /dev/null
> +++ b/drivers/watchdog/bd9576_wdt.c
> @@ -0,0 +1,290 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2020 ROHM Semiconductors
> + *
> + * ROHM BD9576MUF and BD9573MUF Watchdog driver
> + */
> +
> +#include <linux/err.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/mfd/rohm-bd957x.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/watchdog.h>
> +
> +static bool nowayout;
> +module_param(nowayout, bool, 0);
> +MODULE_PARM_DESC(nowayout,
> +		"Watchdog cannot be stopped once started (default=\"false\")");
> +
> +#define HW_MARGIN_MIN 2
> +#define HW_MARGIN_MAX 4416
> +#define BD957X_WDT_DEFAULT_MARGIN 4416
> +
> +struct bd9576_wdt_priv {
> +	struct gpio_desc	*gpiod_ping;
> +	struct gpio_desc	*gpiod_en;
> +	struct device		*dev;
> +	struct regmap		*regmap;
> +	bool			always_running;
> +	struct watchdog_device	wdd;
> +};
> +
> +static void bd9576_wdt_disable(struct bd9576_wdt_priv *priv)
> +{
> +	gpiod_set_value_cansleep(priv->gpiod_en, 0);
> +}
> +
> +static int bd9576_wdt_ping(struct watchdog_device *wdd)
> +{
> +	struct bd9576_wdt_priv *priv = watchdog_get_drvdata(wdd);
> +
> +	/* Pulse */
> +	gpiod_set_value_cansleep(priv->gpiod_ping, 1);
> +	gpiod_set_value_cansleep(priv->gpiod_ping, 0);
> +
> +	return 0;
> +}
> +
> +static int bd9576_wdt_start(struct watchdog_device *wdd)
> +{
> +	struct bd9576_wdt_priv *priv = watchdog_get_drvdata(wdd);
> +
> +	gpiod_set_value_cansleep(priv->gpiod_en, 1);
> +
> +	return bd9576_wdt_ping(wdd);
> +}
> +
> +static int bd9576_wdt_stop(struct watchdog_device *wdd)
> +{
> +	struct bd9576_wdt_priv *priv = watchdog_get_drvdata(wdd);
> +
> +	if (!priv->always_running)
> +		bd9576_wdt_disable(priv);
> +	else
> +		set_bit(WDOG_HW_RUNNING, &wdd->status);
> +
> +	return 0;
> +}
> +
> +static const struct watchdog_info bd957x_wdt_ident = {
> +	.options	= WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING |
> +			  WDIOF_SETTIMEOUT,
> +	.identity	= "BD957x Watchdog",
> +};
> +
> +static const struct watchdog_ops bd957x_wdt_ops = {
> +	.owner		= THIS_MODULE,
> +	.start		= bd9576_wdt_start,
> +	.stop		= bd9576_wdt_stop,
> +	.ping		= bd9576_wdt_ping,
> +};
> +
> +/* Unit is hundreds of uS */
> +#define FASTNG_MIN 23
> +
> +static int find_closest_fast(int target, int *sel, int *val)
> +{
> +	int i;
> +	int window = FASTNG_MIN;
> +
> +	for (i = 0; i < 8 && window < target; i++)
> +		window <<= 1;
> +
> +	*val = window;
> +	*sel = i;
> +
> +	if (i == 8)
> +		return -EINVAL;
> +
> +	return 0;
> +
> +}
> +
> +static int find_closest_slow_by_fast(int fast_val, int target, int *slowsel)
> +{
> +	int sel;
> +	static const int multipliers[] = {2, 3, 7, 15};
> +
> +	for (sel = 0; sel < ARRAY_SIZE(multipliers) &&
> +	     multipliers[sel] * fast_val < target; sel++)
> +		;
> +
> +	if (sel == ARRAY_SIZE(multipliers))
> +		return -EINVAL;
> +
> +	*slowsel = sel;
> +
> +	return 0;
> +}
> +
> +static int find_closest_slow(int target, int *slow_sel, int *fast_sel)
> +{
> +	static const int multipliers[] = {2, 3, 7, 15};
> +	int i, j;
> +	int val = 0;
> +	int window = FASTNG_MIN;
> +
> +	for (i = 0; i < 8; i++) {
> +		for (j = 0; j < ARRAY_SIZE(multipliers); j++) {
> +			int slow;
> +
> +			slow = window * multipliers[j];
> +			if (slow >= target && (!val || slow < val)) {
> +				val = slow;
> +				*fast_sel = i;
> +				*slow_sel = j;
> +			}
> +		}
> +		window <<= 1;
> +	}
> +	if (!val)
> +		return -EINVAL;
> +
> +	return 0;
> +}
> +
> +#define BD957X_WDG_TYPE_WINDOW BIT(5)
> +#define BD957X_WDG_TYPE_SLOW 0
> +#define BD957X_WDG_TYPE_MASK BIT(5)
> +#define BD957X_WDG_NG_RATIO_MASK 0x18
> +#define BD957X_WDG_FASTNG_MASK 0x7
> +
> +static int bd957x_set_wdt_mode(struct bd9576_wdt_priv *priv, int hw_margin,
> +			       int hw_margin_min)
> +{
> +	int ret, fastng, slowng, type, reg, mask;
> +	struct device *dev = priv->dev;
> +
> +	/* convert to 100uS */
> +	hw_margin *= 10;
> +	hw_margin_min *= 10;
> +	if (hw_margin_min) {
> +		int min;
> +
> +		type = BD957X_WDG_TYPE_WINDOW;
> +		dev_dbg(dev, "Setting type WINDOW 0x%x\n", type);
> +		ret = find_closest_fast(hw_margin_min, &fastng, &min);
> +		if (ret) {
> +			dev_err(dev, "bad WDT window for fast timeout\n");
> +			return ret;
> +		}
> +
> +		ret = find_closest_slow_by_fast(min, hw_margin, &slowng);
> +		if (ret) {
> +			dev_err(dev, "bad WDT window\n");
> +			return ret;
> +		}
> +
> +	} else {
> +		type = BD957X_WDG_TYPE_SLOW;
> +		dev_dbg(dev, "Setting type SLOW 0x%x\n", type);
> +		ret = find_closest_slow(hw_margin, &slowng, &fastng);
> +		if (ret) {
> +			dev_err(dev, "bad WDT window\n");
> +			return ret;
> +		}
> +	}
> +
> +	slowng <<= ffs(BD957X_WDG_NG_RATIO_MASK) - 1;
> +	reg = type | slowng | fastng;
> +	mask = BD957X_WDG_TYPE_MASK | BD957X_WDG_NG_RATIO_MASK |
> +	       BD957X_WDG_FASTNG_MASK;
> +	ret = regmap_update_bits(priv->regmap, BD957X_REG_WDT_CONF,
> +				 mask, reg);
> +
> +	return ret;
> +}
> +
> +static int bd9576_wdt_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->parent->of_node;
> +	struct bd9576_wdt_priv *priv;
> +	u32 hw_margin[2];
> +	u32 hw_margin_max = BD957X_WDT_DEFAULT_MARGIN, hw_margin_min = 0;
> +	int ret;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, priv);
> +
> +	priv->dev = dev;
> +	priv->regmap = dev_get_regmap(dev->parent, NULL);
> +	if (!priv->regmap) {
> +		dev_err(dev, "No regmap found\n");
> +		return -ENODEV;
> +	}
> +
> +	priv->gpiod_en = devm_gpiod_get_from_of_node(dev, dev->parent->of_node,
> +						     "rohm,watchdog-enable-gpios",
> +						     0, GPIOD_OUT_LOW,
> +						     "watchdog-enable");
> +	if (IS_ERR(priv->gpiod_en))
> +		return dev_err_probe(dev, PTR_ERR(priv->gpiod_en),
> +			      "getting watchdog-enable GPIO failed\n");
> +
> +	priv->gpiod_ping = devm_gpiod_get_from_of_node(dev, dev->parent->of_node,
> +						     "rohm,watchdog-ping-gpios",
> +						     0, GPIOD_OUT_LOW,
> +						     "watchdog-ping");
> +	if (IS_ERR(priv->gpiod_ping))
> +		return dev_err_probe(dev, PTR_ERR(priv->gpiod_ping),
> +				     "getting watchdog-ping GPIO failed\n");
> +
> +	ret = of_property_read_variable_u32_array(np, "rohm,hw-timeout-ms",
> +						  &hw_margin[0], 1, 2);
> +	if (ret < 0 && ret != -EINVAL)
> +		return ret;
> +
> +	if (ret == 1)
> +		hw_margin_max = hw_margin[0];
> +
> +	if (ret == 2) {
> +		hw_margin_max = hw_margin[1];
> +		hw_margin_min = hw_margin[0];
> +	}
> +
> +	ret = bd957x_set_wdt_mode(priv, hw_margin_max, hw_margin_min);
> +	if (ret)
> +		return ret;
> +
> +	priv->always_running = of_property_read_bool(np, "always-running");
> +
> +	watchdog_set_drvdata(&priv->wdd, priv);
> +
> +	priv->wdd.info			= &bd957x_wdt_ident;
> +	priv->wdd.ops			= &bd957x_wdt_ops;
> +	priv->wdd.min_hw_heartbeat_ms	= hw_margin_min;
> +	priv->wdd.max_hw_heartbeat_ms	= hw_margin_max;
> +	priv->wdd.parent		= dev;
> +	priv->wdd.timeout		= (hw_margin_max / 2) * 1000;
> +
> +	watchdog_init_timeout(&priv->wdd, 0, dev);
> +	watchdog_set_nowayout(&priv->wdd, nowayout);
> +
> +	watchdog_stop_on_reboot(&priv->wdd);
> +
> +	if (priv->always_running)
> +		bd9576_wdt_start(&priv->wdd);
> +
> +	return devm_watchdog_register_device(dev, &priv->wdd);
> +}
> +
> +static struct platform_driver bd9576_wdt_driver = {
> +	.driver	= {
> +		.name = "bd9576-wdt",
> +	},
> +	.probe	= bd9576_wdt_probe,
> +};
> +
> +module_platform_driver(bd9576_wdt_driver);
> +
> +MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
> +MODULE_DESCRIPTION("ROHM BD9576/BD9573 Watchdog driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:bd9576-wdt");
> -- 
> 2.21.0
> 
> 
> -- 
> Matti Vaittinen, Linux device drivers
> ROHM Semiconductors, Finland SWDC
> Kiviharjunlenkki 1E
> 90220 OULU
> FINLAND
> 
> ~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
> Simon says - in Latin please.
> ~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
> Thanks to Simon Glass for the translation =] 

^ permalink raw reply	[flat|nested] 7+ messages in thread

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Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-09-29  8:14 [PATCH v3 0/4] Support ROHM BD9576MUF and BD9573MUF PMICs Matti Vaittinen
2020-09-29  8:15 ` [PATCH v3 1/4] dt_bindings: mfd: Add " Matti Vaittinen
2020-09-29 14:53   ` Rob Herring
2020-09-29  8:16 ` [PATCH v3 2/4] mfd: Support ROHM BD9576MUF and BD9573MUF Matti Vaittinen
2020-09-29  8:17 ` [PATCH v3 3/4] wdt: Support wdt on " Matti Vaittinen
2020-10-01 15:30   ` Guenter Roeck
2020-09-29  8:17 ` [PATCH v3 4/4] MAINTAINERS: Add ROHM BD9576MUF and BD9573MUF drivers Matti Vaittinen

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