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Date: Mon, 5 Jun 2017 10:29:48 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Valentin Sitdikov <valentin_sitdikov@...tor.com>
Cc: robh+dt@...nel.org, mark.rutland@....com,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Andrei Dranitca <Andrei_Dranitca@...tor.com>
Subject: Re: [PATCH 2/2] mfd: max7360: Add mfd core device driver
On Fri, 02 Jun 2017, Valentin Sitdikov wrote:
> From: Andrei Dranitca <Andrei_Dranitca@...tor.com>
>
> This patch adds core/IRQ driver to support MAX7360 I2C chip
> which contains keypad, GPIO, PWM, GPO and rotary encoder submodules.
>
> Signed-off-by: Andrei Dranitca <Andrei_Dranitca@...tor.com>
> Signed-off-by: Valentin Sitdikov <valentin_sitdikov@...tor.com>
> ---
> drivers/mfd/Kconfig | 16 +++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/max7360.c | 302 ++++++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/max7360.h | 90 +++++++++++++
> 4 files changed, 409 insertions(+)
> create mode 100644 drivers/mfd/max7360.c
> create mode 100644 include/linux/mfd/max7360.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 3eb5c93..894c2e9 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -721,6 +721,22 @@ config MFD_MAX8998
> additional drivers must be enabled in order to use the functionality
> of the device.
>
> +config MFD_MAX7360
> + tristate "Maxim Semiconductor MAX7360 support"
> + depends on I2C && OF
> + select MFD_CORE
> + select REGMAP_I2C
> + select IRQ_DOMAIN
> + help
> + Say yes here to add support for Maxim Semiconductor MAX7360.
> + This provides microprocessors with management of up to 64 key switches,
> + with an additional eight LED drivers/GPIOs that feature constant-current,
> + PWM intensity control, and rotary switch control options.
> +
> + This driver provides common support for accessing the device,
> + additional drivers must be enabled in order to use the functionality
> + of the device.
> +
> config MFD_MT6397
> tristate "MediaTek MT6397 PMIC Support"
> select MFD_CORE
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index c16bf1e..9e721c0 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -137,6 +137,7 @@ obj-$(CONFIG_MFD_DA9063) += da9063.o
> obj-$(CONFIG_MFD_DA9150) += da9150-core.o
>
> obj-$(CONFIG_MFD_MAX14577) += max14577.o
> +obj-$(CONFIG_MFD_MAX7360) += max7360.o
> obj-$(CONFIG_MFD_MAX77620) += max77620.o
> obj-$(CONFIG_MFD_MAX77686) += max77686.o
> obj-$(CONFIG_MFD_MAX77693) += max77693.o
> diff --git a/drivers/mfd/max7360.c b/drivers/mfd/max7360.c
> new file mode 100644
> index 0000000..2bfd3e2
> --- /dev/null
> +++ b/drivers/mfd/max7360.c
> @@ -0,0 +1,302 @@
> +/*
> + * Copyright (C) 2017 Mentor Graphics
> + *
> + * Author: Andrei Dranitca <Andrei_Dranitca@...tor.com>
> + * Author: Valentin Sitdikov <Valentin.Sitdikov@...tor.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/max7360.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/slab.h>
> +
> +
> +static const struct mfd_cell max7360_devices[] = {
> + {
> + .name = "max7360-gpio",
> + .of_compatible = "maxim,max7360-gpio",
> + },
> + {
> + .name = "max7360-keypad",
> + .of_compatible = "maxim,max7360-keypad",
> + },
> + {
> + .name = "max7360-pwm",
> + .of_compatible = "maxim,max7360-pwm",
> + },
> + {
> + .name = "max7360-rotary",
> + .of_compatible = "maxim,max7360-rotary",
> + },
> +};
> +
> +static irqreturn_t max7360_irq(int irq, void *data)
> +{
> + struct max7360 *max7360 = data;
> + int virq;
> +
> + virq = irq_find_mapping(max7360->domain, MAX7360_INT_GPIO);
> + handle_nested_irq(virq);
> + virq = irq_find_mapping(max7360->domain, MAX7360_INT_KEYPAD);
> + handle_nested_irq(virq);
> + virq = irq_find_mapping(max7360->domain, MAX7360_INT_ROTARY);
> + handle_nested_irq(virq);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t max7360_irqi(int irq, void *data)
> +{
> + struct max7360 *max7360 = data;
> + int virq;
> +
> + virq = irq_find_mapping(max7360->domain, MAX7360_INT_GPIO);
> + handle_nested_irq(virq);
> + virq = irq_find_mapping(max7360->domain, MAX7360_INT_ROTARY);
> + handle_nested_irq(virq);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t max7360_irqk(int irq, void *data)
> +{
> + struct max7360 *max7360 = data;
> + int virq;
> +
> + virq = irq_find_mapping(max7360->domain, MAX7360_INT_KEYPAD);
> + handle_nested_irq(virq);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int max7360_irq_map(struct irq_domain *d, unsigned int virq,
> + irq_hw_number_t hwirq)
> +{
> + struct max7360 *max7360 = d->host_data;
> +
> + irq_set_chip_data(virq, max7360);
> + irq_set_chip_and_handler(virq, &dummy_irq_chip,
> + handle_edge_irq);
> + irq_set_nested_thread(virq, 1);
> + irq_set_noprobe(virq);
> +
> + return 0;
> +}
> +
> +static void max7360_irq_unmap(struct irq_domain *d, unsigned int virq)
> +{
> + irq_set_chip_and_handler(virq, NULL, NULL);
> + irq_set_chip_data(virq, NULL);
> +}
> +
> +static const struct irq_domain_ops max7360_irq_ops = {
> + .map = max7360_irq_map,
> + .unmap = max7360_irq_unmap,
> + .xlate = irq_domain_xlate_onecell,
> +};
> +
> +static void max7360_free_irqs(struct max7360 *max7360)
> +{
> + if (max7360->shared_irq)
> + free_irq(max7360->shared_irq, max7360);
> + else {
> + free_irq(max7360->irq_inti, max7360);
> + free_irq(max7360->irq_intk, max7360);
> + }
> +}
> +
> +static int max7360_irq_init(struct max7360 *max7360, struct device_node *np)
> +{
> + int ret;
> +
> + max7360->irq_inti = of_irq_get_byname(np, "inti");
> + if (max7360->irq_inti < 0) {
> + dev_err(max7360->dev, "no inti provided");
> + return -ENODEV;
> + }
> +
> + max7360->irq_intk = of_irq_get_byname(np, "intk");
> + if (max7360->irq_intk < 0) {
> + dev_err(max7360->dev, "no intk provided");
> + return -ENODEV;
> + }
> +
> + if (max7360->irq_inti == max7360->irq_intk) {
> + /*
> + * In case of pin inti and pin intk are the connected
> + * to the same soc`s irq pin.
> + */
> + max7360->shared_irq = max7360->irq_inti;
> + ret = request_threaded_irq(max7360->shared_irq, NULL,
> + max7360_irq,
> + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> + "max7360", max7360);
> + if (ret) {
> + dev_err(max7360->dev, "failed to request IRQ: %d\n",
> + ret);
> + return ret;
> + }
> + } else {
> + max7360->shared_irq = 0;
> + ret = request_threaded_irq(max7360->irq_inti, NULL,
> + max7360_irqi,
> + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> + "max7360", max7360);
> + if (ret) {
> + dev_err(max7360->dev, "failed to request inti IRQ: %d\n",
> + ret);
> + return ret;
> + }
> +
> + ret = request_threaded_irq(max7360->irq_intk, NULL,
> + max7360_irqk,
> + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> + "max7360", max7360);
> + if (ret) {
> + free_irq(max7360->irq_inti, max7360);
> + dev_err(max7360->dev, "failed to request intk IRQ: %d\n",
> + ret);
> + return ret;
> + }
> + }
> +
> + max7360->domain = irq_domain_add_simple(np, MAX7360_NR_INTERNAL_IRQS,
> + 0, &max7360_irq_ops, max7360);
> +
> + if (!max7360->domain) {
> + max7360_free_irqs(max7360);
> + dev_err(max7360->dev, "Failed to create irqdomain\n");
> + return -ENODEV;
> + }
> +
> + ret = irq_create_mapping(max7360->domain, MAX7360_INT_GPIO);
> + if (!ret) {
> + max7360_free_irqs(max7360);
> + dev_err(max7360->dev, "Failed to map GPIO IRQ\n");
> + return -EINVAL;
> + }
> +
> + ret = irq_create_mapping(max7360->domain, MAX7360_INT_KEYPAD);
> + if (!ret) {
> + max7360_free_irqs(max7360);
> + dev_err(max7360->dev, "Failed to map KEYPAD IRQ\n");
> + return -EINVAL;
> + }
> +
> + ret = irq_create_mapping(max7360->domain, MAX7360_INT_ROTARY);
> + if (!ret) {
> + max7360_free_irqs(max7360);
> + dev_err(max7360->dev, "Failed to map ROTARY IRQ\n");
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +static int max7360_device_init(struct max7360 *max7360)
> +{
> + int ret;
> +
> + ret = mfd_add_devices(max7360->dev, PLATFORM_DEVID_NONE,
> + max7360_devices,
> + ARRAY_SIZE(max7360_devices), NULL,
> + 0, max7360->domain);
> + if (ret)
> + dev_err(max7360->dev, "failed to add child devices\n");
> +
> + return ret;
> +}
> +
> +static const struct regmap_range max7360_volatile_ranges[] = {
> + {
> + .range_min = MAX7360_REG_KEYFIFO,
> + .range_max = MAX7360_REG_KEYFIFO,
> + }, {
> + .range_min = MAX7360_REG_GPIOIN,
> + .range_max = MAX7360_REG_GPIOIN,
> + },
> +};
> +
> +static const struct regmap_access_table max7360_volatile_table = {
> + .yes_ranges = max7360_volatile_ranges,
> + .n_yes_ranges = ARRAY_SIZE(max7360_volatile_ranges),
> +};
> +
> +static const struct regmap_config max7360_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = 0xff,
> + .volatile_table = &max7360_volatile_table,
> + .cache_type = REGCACHE_RBTREE,
> +};
> +
> +static int max7360_probe(struct i2c_client *i2c,
> + const struct i2c_device_id *id)
> +{
> + struct device_node *np = i2c->dev.of_node;
> + struct max7360 *max7360;
> + int ret;
> +
> + max7360 = devm_kzalloc(&i2c->dev, sizeof(struct max7360),
> + GFP_KERNEL);
> + if (!max7360)
> + return -ENOMEM;
> +
> + max7360->dev = &i2c->dev;
> + max7360->i2c = i2c;
> +
> + i2c_set_clientdata(i2c, max7360);
> +
> + max7360->regmap = devm_regmap_init_i2c(i2c, &max7360_regmap_config);
> +
> + ret = max7360_irq_init(max7360, np);
> + if (ret)
> + return ret;
> +
> + ret = max7360_device_init(max7360);
> + if (ret) {
> + dev_err(max7360->dev, "failed to add child devices\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int max7360_remove(struct i2c_client *client)
> +{
> + struct max7360 *max7360 = i2c_get_clientdata(client);
> +
> + mfd_remove_devices(max7360->dev);
Any reason you can't use devm_*?
Then this whole function can go away.
> + return 0;
> +}
> +
> +static const struct of_device_id max7360_match[] = {
> + { .compatible = "maxim,max7360" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, max7360_match);
> +
> +static struct i2c_driver max7360_driver = {
> + .driver = {
> + .name = "max7360",
> + .of_match_table = max7360_match,
> + },
> + .probe = max7360_probe,
> + .remove = max7360_remove,
I'd rather you didn't try to line up the '='.
It doesn't improve the code/readability IMHO.
> +};
> +
Remove this line.
> +builtin_i2c_driver(max7360_driver);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("MAX7360 MFD core driver");
> diff --git a/include/linux/mfd/max7360.h b/include/linux/mfd/max7360.h
> new file mode 100644
> index 0000000..c350d5e
> --- /dev/null
> +++ b/include/linux/mfd/max7360.h
> @@ -0,0 +1,90 @@
> +#ifndef __LINUX_MFD_MAX7360_H
> +#define __LINUX_MFD_MAX7360_H
> +#include <linux/regmap.h>
> +
> +#define MAX7360_MAX_KEY_ROWS 8
> +#define MAX7360_MAX_KEY_COLS 8
> +#define MAX7360_MAX_KEY_NUM (MAX7360_MAX_KEY_ROWS * MAX7360_MAX_KEY_COLS)
> +#define MAX7360_ROW_SHIFT 3
> +
> +#define MAX7360_MAX_GPIO 8
> +#define MAX7360_MAX_GPO 6
> +#define MAX7360_COL_GPO_PINS 8
> +/*
> + * MAX7360 registers
> + */
> +#define MAX7360_REG_KEYFIFO 0x00
> +#define MAX7360_REG_CONFIG 0x01
> +#define MAX7360_REG_DEBOUNCE 0x02
> +#define MAX7360_REG_INTERRUPT 0x03
> +#define MAX7360_REG_PORTS 0x04
> +#define MAX7360_REG_KEYREP 0x05
> +#define MAX7360_REG_SLEEP 0x06
> +
> +/*
> + * MAX7360 registers
> + */
> +#define MAX7360_REG_GPIOCFG 0x40
> +#define MAX7360_REG_GPIOCTRL 0x41
> +#define MAX7360_REG_GPIODEB 0x42
> +#define MAX7360_REG_GPIOCURR 0x43
> +#define MAX7360_REG_GPIOOUTM 0x44
> +#define MAX7360_REG_PWMCOM 0x45
> +#define MAX7360_REG_RTRCFG 0x46
> +#define MAX7360_REG_GPIOIN 0x49
> +#define MAX7360_REG_RTR_CNT 0x4A
> +#define MAX7360_REG_PWMBASE 0x50
> +#define MAX7360_REG_PWMCFG 0x58
> +
> +
> +#define MAX7360_REG_PORTCFGBASE 0x58
> +
> +/*
> + * Configuration register bits
> + */
> +#define MAX7360_CFG_SLEEP BIT(7)
> +#define MAX7360_CFG_INTERRUPT BIT(5)
> +#define MAX7360_CFG_KEY_RELEASE BIT(3)
> +#define MAX7360_CFG_WAKEUP BIT(1)
> +#define MAX7360_CFG_TIMEOUT BIT(0)
> +
> +/*
> + * Autosleep register values (ms)
> + */
> +#define MAX7360_AUTOSLEEP_8192 0x01
> +#define MAX7360_AUTOSLEEP_4096 0x02
> +#define MAX7360_AUTOSLEEP_2048 0x03
> +#define MAX7360_AUTOSLEEP_1024 0x04
> +#define MAX7360_AUTOSLEEP_512 0x05
> +#define MAX7360_AUTOSLEEP_256 0x06
> +
> +#define MAX7360_INT_INTI 0
> +#define MAX7360_INT_INTK 1
> +
> +#define MAX7360_INT_GPIO 0
> +#define MAX7360_INT_KEYPAD 1
> +#define MAX7360_INT_ROTARY 2
> +
> +#define MAX7360_NR_INTERNAL_IRQS 3
> +
> +/**
> + * struct max7360
> + * @dev: Parent device pointer
> + * @i2c: I2c client pointer
> + * @domain: Irq domain pointer
> + * @regmap: Used for I2C communication on accessing registers
> + * shared_irq: Irq number if inti and intk pins are connected together
> + * irq_inti: Irq number for inti pin
> + * irq_intk: Irq number for inik pin
> + */
Don't you think:
> + * @dev: Parent device pointer
> + * @i2c: I2c client pointer
> + * @domain: Irq domain pointer
> + * @regmap: Used for I2C communication on accessing registers
> + * shared_irq: Irq number if inti and intk pins are connected together
> + * irq_inti: Irq number for inti pin
> + * irq_intk: Irq number for inik pin
.. is better?
> +struct max7360 {
> + struct device *dev;
> + struct i2c_client *i2c;
> + struct irq_domain *domain;
> + struct regmap *regmap;
> +
> + int shared_irq;
> + int irq_inti;
> + int irq_intk;
Same here:
> + struct device *dev;
> + struct i2c_client *i2c;
> + struct irq_domain *domain;
> + struct regmap *regmap;
> +
> + int shared_irq;
> + int irq_inti;
> + int irq_intk;
> +};
> +#endif
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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