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Date: Tue, 14 Jun 2022 22:32:25 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Markuss Broks <markuss.broks@...il.com>
Cc: linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
~postmarketos/upstreaming@...ts.sr.ht,
Matti Vaittinen <mazziesaccount@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
MyungJoo Ham <myungjoo.ham@...sung.com>,
Chanwoo Choi <cw00.choi@...sung.com>,
devicetree@...r.kernel.org
Subject: Re: [PATCH v5 4/5] mfd: sm5703: Add support for SM5703 MFD
On Sat, 23 Apr 2022, Markuss Broks wrote:
> Silicon Mitus SM5703 is a multi-function device, meant to be
Please avoid using the term MFD.
How is the device described in the data-sheet?
What do you mean by "meant to be"?
> used in mobile devices. It has several modules: LDO, BUCK regulators,
Modules or functions?
> charger circuit, flash LED driver, a fuel gauge for monitoring the battery
> and a MUIC USB switcher. The MUIC and fuel gauge parts are separate in that
> they use separate i2c lines to communicate with the device, while charger
"I2C"
> circuit, LED driver and regulators are on the main i2c line the device is
> controlled with.
>
> Signed-off-by: Markuss Broks <markuss.broks@...il.com>
> ---
> MAINTAINERS | 8 +++
> drivers/mfd/Kconfig | 13 +++++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/sm5703.c | 78 +++++++++++++++++++++++++++
> include/linux/mfd/sm5703.h | 105 +++++++++++++++++++++++++++++++++++++
> 5 files changed, 205 insertions(+)
> create mode 100644 drivers/mfd/sm5703.c
> create mode 100644 include/linux/mfd/sm5703.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 6157e706ed02..6125ed1a3be4 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -18172,6 +18172,14 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev
> F: include/linux/srcu*.h
> F: kernel/rcu/srcu*.c
>
> +SM5703 MFD DRIVER
> +M: Markuss Broks <markuss.broks@...il.com>
> +S: Maintained
> +F: Documentation/devicetree/bindings/mfd/siliconmitus,sm5703.yaml
> +F: Documentation/devicetree/bindings/regulator/siliconmitus,sm5703-regulator.yaml
> +F: drivers/mfd/sm5703.c
> +F: drivers/regulator/sm5703-regulator.c
> +
> SMACK SECURITY MODULE
> M: Casey Schaufler <casey@...aufler-ca.com>
> L: linux-security-module@...r.kernel.org
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 3b59456f5545..c13a99ceae99 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1237,6 +1237,19 @@ config MFD_SM501
> interface. The device may be connected by PCI or local bus with
> varying functions enabled.
>
> +config MFD_SM5703
> + tristate "Silicon Mitus SM5703 MFD"
> + depends on I2C
> + depends on OF
> + select MFD_CORE
> + select REGMAP_I2C
> + help
> + This is the core driver for the Silicon Mitus SM5703 multi-function
Please drop the MFD term, as above.
> + device. This device is meant to be used in phones and it has numerous
"meant to be"?
> + modules, including LED controller, regulators, fuel gauge, MUIC and
Either "an LED controller" or "LED controllers"
Same with "charger circuit" below.
> + charger circuit. It also support muxing a serial interface over USB
"supports"
What kind of serial?
> + data lines.
> +
> config MFD_SM501_GPIO
> bool "Export GPIO via GPIO layer"
> depends on MFD_SM501 && GPIOLIB
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 858cacf659d6..ca8b86736a36 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -275,3 +275,4 @@ rsmu-i2c-objs := rsmu_core.o rsmu_i2c.o
> rsmu-spi-objs := rsmu_core.o rsmu_spi.o
> obj-$(CONFIG_MFD_RSMU_I2C) += rsmu-i2c.o
> obj-$(CONFIG_MFD_RSMU_SPI) += rsmu-spi.o
> +obj-$(CONFIG_MFD_SM5703) += sm5703.o
> diff --git a/drivers/mfd/sm5703.c b/drivers/mfd/sm5703.c
> new file mode 100644
> index 000000000000..7f9838149051
> --- /dev/null
> +++ b/drivers/mfd/sm5703.c
> @@ -0,0 +1,78 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +#include <linux/err.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/sm5703.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/regmap.h>
> +
> +static const struct mfd_cell sm5703_devs[] = {
> + { .name = "sm5703-regulator", },
> +};
Where are the rest of the child drivers?
> +static const struct regmap_config sm5703_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
Tabbing looks odd. Just use a space.
> +};
> +
> +static int sm5703_i2c_probe(struct i2c_client *i2c,
> + const struct i2c_device_id *id)
> +{
> + struct sm5703_dev *sm5703;
> + struct device *dev = &i2c->dev;
> + unsigned int dev_id;
> + int ret;
> +
> + sm5703 = devm_kzalloc(dev, sizeof(*sm5703), GFP_KERNEL);
> + if (!sm5703)
> + return -ENOMEM;
> +
> + i2c_set_clientdata(i2c, sm5703);
> + sm5703->dev = dev;
> +
> + sm5703->regmap = devm_regmap_init_i2c(i2c, &sm5703_regmap_config);
> + if (IS_ERR(sm5703->regmap))
> + return dev_err_probe(dev, PTR_ERR(sm5703->regmap),
> + "Failed to allocate the register map\n");
> +
> + sm5703->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> + if (IS_ERR(sm5703->reset_gpio))
> + return dev_err_probe(dev, PTR_ERR(sm5703->reset_gpio), "Cannot get reset GPIO\n");
> +
> + gpiod_set_value_cansleep(sm5703->reset_gpio, 1);
> + msleep(20);
> +
> + ret = regmap_read(sm5703->regmap, SM5703_DEVICE_ID, &dev_id);
> + if (ret)
> + return dev_err_probe(dev, -ENODEV, "Device not found\n");
> +
> + ret = devm_mfd_add_devices(sm5703->dev, -1, sm5703_devs,
Not -1. Please use the defines provided.
> + ARRAY_SIZE(sm5703_devs), NULL, 0, NULL);
> + if (ret)
> + return dev_err_probe(dev, ret, "Failed to add child devices\n");
> +
> + return 0;
> +}
> +
> +static const struct of_device_id sm5703_of_match[] = {
> + { .compatible = "siliconmitus,sm5703", },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, sm5703_of_match);
> +
> +static struct i2c_driver sm5703_driver = {
> + .driver = {
> + .name = "sm5703",
> + .of_match_table = sm5703_of_match,
> + },
> + .probe = sm5703_i2c_probe,
> +};
> +module_i2c_driver(sm5703_driver);
> +
> +MODULE_DESCRIPTION("Silicon Mitus SM5703 multi-function device driver");
There is no such thing as an MFD.
> +MODULE_AUTHOR("Markuss Broks <markuss.broks@...il.com>");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/mfd/sm5703.h b/include/linux/mfd/sm5703.h
> new file mode 100644
> index 000000000000..c62affa0d3f1
> --- /dev/null
> +++ b/include/linux/mfd/sm5703.h
> @@ -0,0 +1,105 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +
> +#ifndef _SM5703_H
> +#define _SM5703_H
> +
> +struct sm5703_dev {
> + struct device *dev;
> + struct regmap *regmap;
> + struct gpio_desc *reset_gpio;
> +};
> +
> +// Regulator-related defines
No C++ style comments.
> +#define SM5703_REG_LDO1 0x1A
I'd drop the REG parts from these.
What are these registers called in the data-sheet?
> +#define SM5703_REG_LDO2 0x1B
> +#define SM5703_REG_LDO3 0x1C
> +#define SM5703_LDO_EN BIT(3)
Some people like to space out the bits to differentiate them from the
register addresses.
> +#define SM5703_LDO_VOLT_MASK 0x7
Please keep the bit length consistent, so 0x07 here if these are Byte
length registers.
> +#define SM5703_BUCK_VOLT_MASK 0x1F
> +#define SM5703_REG_USBLDO12 0x1C
> +#define SM5703_REG_EN_USBLDO1 BIT(6)
> +#define SM5703_REG_EN_USBLDO2 BIT(7)
> +#define SM5703_REG_BUCK 0x1D
Please place these in order.
> +#define SM5703_REG_EN_BUCK BIT(6)
> +#define SM5703_USBLDO_MICROVOLT 4800000
> +#define SM5703_VBUS_MICROVOLT 5000000
> +
> +// Fuel-Gauge-related defines
> +
> +#define SM5703_FG_REG_DEVICE_ID 0x00
> +#define SM5703_FG_REG_CNTL 0x01
> +#define SM5703_FG_REG_INTFG 0x02
> +#define SM5703_FG_REG_INTFG_MASK 0x03
> +#define SM5703_FG_REG_STATUS 0x04
> +#define SM5703_FG_REG_SOC 0x05
> +#define SM5703_FG_REG_OCV 0x06
> +#define SM5703_FG_REG_VOLTAGE 0x07
> +#define SM5703_FG_REG_CURRENT 0x08
> +#define SM5703_FG_REG_TEMPERATURE 0x09
> +#define SM5703_FG_REG_CURRENT_EST 0x85
> +#define SM5703_FG_REG_FG_OP_STATUS 0x10
> +
> +// Flash LED driver-related defines
> +
> +#define SM5703_FLEDCNTL1 0x14
> +#define SM5703_FLEDCNTL2 0x15
> +#define SM5703_FLEDCNTL3 0x16
> +#define SM5703_FLEDCNTL4 0x17
> +#define SM5703_FLEDCNTL5 0x18
> +#define SM5703_FLEDCNTL6 0x19
> +
> +#define SM5703_FLEDEN_MASK 0x03
> +#define SM5703_FLEDEN_DISABLE 0x00
> +#define SM5703_FLEDEN_MOVIE_MODE 0x01
> +#define SM5703_FLEDEN_FLASH_MODE 0x02
> +#define SM5703_FLEDEN_EXTERNAL 0x03
> +
> +#define SM5703_IFLED_MASK 0x1F
> +#define SM5703_IMLED_MASK 0x1F
> +
> +// Charger-related, IRQ and device ID defines
> +
> +#define SM5703_REG_CNTL 0x0C
> +#define SM5703_VBUSCNTL 0x0D
> +#define SM5703_CHGCNTL1 0x0E
> +#define SM5703_CHGCNTL2 0x0F
> +#define SM5703_CHGCNTL3 0x10
> +#define SM5703_CHGCNTL4 0x11
> +#define SM5703_CHGCNTL5 0x12
> +#define SM5703_CHGCNTL6 0x13
> +#define SM5703_OTGCURRENTCNTL 0x60
> +#define SM5703_Q3LIMITCNTL 0x66
> +#define SM5703_DEVICE_ID 0x1E
> +#define SM5703_OPERATION_MODE 0x07
> +#define SM5703_OPERATION_MODE_MASK 0x07
> +
> +#define SM5703_OPERATION_MODE_SUSPEND 0x00
> +#define SM5703_OPERATION_MODE_CHARGING_OFF 0x04
> +#define SM5703_OPERATION_MODE_CHARGING_ON 0x05
> +#define SM5703_OPERATION_MODE_FLASH_BOOST_MODE 0x06
> +#define SM5703_OPERATION_MODE_USB_OTG_MODE 0x07
> +
> +#define SM5703_BSTOUT 0x0F
> +#define SM5703_BSTOUT_MASK 0x0F
> +#define SM5703_BSTOUT_SHIFT 0
> +
> +#define SM5703_BSTOUT_4P5 0x05
> +#define SM5703_BSTOUT_5P0 0x0A
> +#define SM5703_BSTOUT_5P1 0x0B
> +
> +#define SM5703_IRQ_STATUS1 0x08
> +#define SM5703_IRQ_STATUS2 0x09
> +#define SM5703_IRQ_STATUS3 0x0A
> +#define SM5703_IRQ_STATUS4 0x0B
> +#define SM5703_IRQ_STATUS5 0x6B
> +
> +#define SM5703_STATUS1_OTGFAIL 0x80
> +#define SM5703_STATUS3_DONE 0x08
> +#define SM5703_STATUS3_TOPOFF 0x04
> +#define SM5703_STATUS3_CHGON 0x01
> +#define SM5703_STATUS5_VBUSOVP 0x80
> +#define SM5703_STATUS5_VBUSUVLO 0x40
> +#define SM5703_STATUS5_VBUSOK 0x20
> +
> +#endif
--
Lee Jones [李琼斯]
Principal Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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