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Message-ID: <ZprbST2aJUXN5Lx1@lizhi-Precision-Tower-5810>
Date: Fri, 19 Jul 2024 17:31:53 -0400
From: Frank Li <Frank.li@....com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-gpio@...r.kernel.org, linux-pwm@...r.kernel.org,
Bartosz Golaszewski <brgl@...ev.pl>,
Conor Dooley <conor+dt@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Lee Jones <lee@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Rob Herring <robh@...nel.org>,
Uwe Kleine-König <ukleinek@...nel.org>,
Haibo Chen <haibo.chen@....com>, Clark Wang <xiaoning.wang@....com>
Subject: Re: [PATCH v5 2/4] mfd: adp5585: Add Analog Devices ADP5585 core
support
On Fri, Jul 19, 2024 at 11:39:44PM +0300, Laurent Pinchart wrote:
> From: Haibo Chen <haibo.chen@....com>
>
> The ADP5585 is a 10/11 input/output port expander with a built in keypad
> matrix decoder, programmable logic, reset generator, and PWM generator.
> This driver supports the chip by modelling it as an MFD device, with two
> child devices for the GPIO and PWM functions.
>
> The driver is derived from an initial implementation from NXP, available
> in commit 8059835bee19 ("MLK-25917-1 mfd: adp5585: add ADI adp5585 core
> support") in their BSP kernel tree. It has been extensively rewritten.
>
> Signed-off-by: Haibo Chen <haibo.chen@....com>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> ---
> Changes since v4:
>
> - One more GENMASK() usage
> - Include err.h
>
> Changes since v2:
>
> - Add missing and remove extraneous headers
> - Use i2c_get_match_data()
> - Drop unneeded parentheses
> - Use GENMASK()
> - Drop of_match_ptr()
> - Allow compilation on !OF with COMPILE_TEST
> - Replace ADP5585_MAN_ID() macro with ADP5585_MAN_ID_MASK
> - Drop unneeded macro
>
> Changes since v1:
>
> - Add comment to explain BANK and BIT macros
> - Drop compatible strings from cells
> - White space fixes
> - Fix comparison to NULL
>
> Changes compared to the NXP original version:
>
> - Add MAINTAINERS entry
> - Fix compatible strings for child devices
> - Fix header guards
> - Use lowercase hex constants
> - White space fixes
> - Use module_i2c_driver()
> - Switch to regmap
> - Drop I2C device ID table
> - Drop ADP5585_REG_MASK
> - Support R5 GPIO pin
> - Drop dev field from adp5585_dev structure
> - Check device ID at probe time
> - Fix register field names
> - Update copyright
> - Update license to GPL-2.0-only
> - Implement suspend/resume
> ---
> MAINTAINERS | 2 +
> drivers/mfd/Kconfig | 12 +++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/adp5585.c | 200 ++++++++++++++++++++++++++++++++++++
> include/linux/mfd/adp5585.h | 126 +++++++++++++++++++++++
> 5 files changed, 341 insertions(+)
> create mode 100644 drivers/mfd/adp5585.c
> create mode 100644 include/linux/mfd/adp5585.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4fe8bd8752a5..ebb1a1833bbc 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -532,6 +532,8 @@ L: linux-gpio@...r.kernel.org
> L: linux-pwm@...r.kernel.org
> S: Maintained
> F: Documentation/devicetree/bindings/*/adi,adp5585*.yaml
> +F: drivers/mfd/adp5585.c
> +F: include/linux/mfd/adp5585.h
>
> ADP5588 QWERTY KEYPAD AND IO EXPANDER DRIVER (ADP5588/ADP5587)
> M: Michael Hennerich <michael.hennerich@...log.com>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 266b4f54af60..05e8e1f0b602 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -20,6 +20,18 @@ config MFD_CS5535
> This is the core driver for CS5535/CS5536 MFD functions. This is
> necessary for using the board's GPIO and MFGPT functionality.
>
> +config MFD_ADP5585
> + tristate "Analog Devices ADP5585 MFD driver"
> + select MFD_CORE
> + select REGMAP_I2C
> + depends on I2C
> + depends on OF || COMPILE_TEST
> + help
> + Say yes here to add support for the Analog Devices ADP5585 GPIO
> + expander, PWM and keypad controller. This includes the I2C driver and
> + the core APIs _only_, you have to select individual components like
> + the GPIO and PWM functions under the corresponding menus.
> +
> config MFD_ALTERA_A10SR
> bool "Altera Arria10 DevKit System Resource chip"
> depends on ARCH_INTEL_SOCFPGA && SPI_MASTER=y && OF
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index c66f07edcd0e..37f36a019a68 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -188,6 +188,7 @@ obj-$(CONFIG_MFD_DB8500_PRCMU) += db8500-prcmu.o
> obj-$(CONFIG_AB8500_CORE) += ab8500-core.o ab8500-sysctrl.o
> obj-$(CONFIG_MFD_TIMBERDALE) += timberdale.o
> obj-$(CONFIG_PMIC_ADP5520) += adp5520.o
> +obj-$(CONFIG_MFD_ADP5585) += adp5585.o
> obj-$(CONFIG_MFD_KEMPLD) += kempld-core.o
> obj-$(CONFIG_MFD_INTEL_QUARK_I2C_GPIO) += intel_quark_i2c_gpio.o
> obj-$(CONFIG_LPC_SCH) += lpc_sch.o
> diff --git a/drivers/mfd/adp5585.c b/drivers/mfd/adp5585.c
> new file mode 100644
> index 000000000000..5dc3e47a0533
> --- /dev/null
> +++ b/drivers/mfd/adp5585.c
> @@ -0,0 +1,200 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Analog Devices ADP5585 I/O expander, PWM controller and keypad controller
> + *
> + * Copyright 2022 NXP
> + * Copyright 2024 Ideas on Board Oy
> + */
> +
> +#include <linux/array_size.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/mfd/adp5585.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/types.h>
> +
> +static const struct mfd_cell adp5585_devs[] = {
> + { .name = "adp5585-gpio", },
> + { .name = "adp5585-pwm", },
> +};
> +
> +static const struct regmap_range adp5585_volatile_ranges[] = {
> + regmap_reg_range(ADP5585_ID, ADP5585_GPI_STATUS_B),
> +};
> +
> +static const struct regmap_access_table adp5585_volatile_regs = {
> + .yes_ranges = adp5585_volatile_ranges,
> + .n_yes_ranges = ARRAY_SIZE(adp5585_volatile_ranges),
> +};
> +
> +static const u8 adp5585_regmap_defaults_00[ADP5585_MAX_REG + 1] = {
> + /* 0x00 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x08 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x10 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x18 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x20 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x28 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x30 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x38 */ 0x00, 0x00, 0x00, 0x00, 0x00,
> +};
> +
> +static const u8 adp5585_regmap_defaults_02[ADP5585_MAX_REG + 1] = {
> + /* 0x00 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x08 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x10 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc3,
> + /* 0x18 */ 0x03, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x20 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x28 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x30 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x38 */ 0x00, 0x00, 0x00, 0x00, 0x00,
> +};
> +
> +static const u8 adp5585_regmap_defaults_04[ADP5585_MAX_REG + 1] = {
> + /* 0x00 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x08 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x10 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55,
> + /* 0x18 */ 0x05, 0x55, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x20 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x28 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x30 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + /* 0x38 */ 0x00, 0x00, 0x00, 0x00, 0x00,
> +};
> +
> +enum adp5585_regmap_type {
> + ADP5585_REGMAP_00,
> + ADP5585_REGMAP_02,
> + ADP5585_REGMAP_04,
> +};
> +
> +static const struct regmap_config adp5585_regmap_configs[] = {
> + [ADP5585_REGMAP_00] = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = ADP5585_MAX_REG,
> + .volatile_table = &adp5585_volatile_regs,
> + .cache_type = REGCACHE_MAPLE,
> + .reg_defaults_raw = adp5585_regmap_defaults_00,
> + .num_reg_defaults_raw = sizeof(adp5585_regmap_defaults_00),
> + },
> + [ADP5585_REGMAP_02] = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = ADP5585_MAX_REG,
> + .volatile_table = &adp5585_volatile_regs,
> + .cache_type = REGCACHE_MAPLE,
> + .reg_defaults_raw = adp5585_regmap_defaults_02,
> + .num_reg_defaults_raw = sizeof(adp5585_regmap_defaults_02),
> + },
> + [ADP5585_REGMAP_04] = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = ADP5585_MAX_REG,
> + .volatile_table = &adp5585_volatile_regs,
> + .cache_type = REGCACHE_MAPLE,
> + .reg_defaults_raw = adp5585_regmap_defaults_04,
> + .num_reg_defaults_raw = sizeof(adp5585_regmap_defaults_04),
> + },
> +};
> +
> +static int adp5585_i2c_probe(struct i2c_client *i2c)
> +{
> + const struct regmap_config *regmap_config;
> + struct adp5585_dev *adp5585;
> + unsigned int id;
> + int ret;
> +
> + adp5585 = devm_kzalloc(&i2c->dev, sizeof(struct adp5585_dev),
> + GFP_KERNEL);
> + if (!adp5585)
> + return -ENOMEM;
> +
> + i2c_set_clientdata(i2c, adp5585);
> +
> + regmap_config = i2c_get_match_data(i2c);
> + adp5585->regmap = devm_regmap_init_i2c(i2c, regmap_config);
> + if (IS_ERR(adp5585->regmap))
> + return dev_err_probe(&i2c->dev, PTR_ERR(adp5585->regmap),
> + "Failed to initialize register map\n");
> +
> + /* Verify the device ID. */
> + ret = regmap_read(adp5585->regmap, ADP5585_ID, &id);
> + if (ret)
> + return dev_err_probe(&i2c->dev, ret,
> + "Failed to read device ID\n");
> +
> + if ((id & ADP5585_MAN_ID_MASK) != ADP5585_MAN_ID_VALUE)
> + return dev_err_probe(&i2c->dev, -ENODEV,
> + "Invalid device ID 0x%02x\n", id);
> +
> + dev_dbg(&i2c->dev, "device ID 0x%02x\n", id);
> +
> + /* Add MFD devices. */
> + ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
> + adp5585_devs, ARRAY_SIZE(adp5585_devs),
> + NULL, 0, NULL);
> + if (ret)
> + return dev_err_probe(&i2c->dev, ret,
> + "Failed to add MFD devices\n");
> +
> + return 0;
> +}
> +
> +static int adp5585_suspend(struct device *dev)
> +{
> + struct adp5585_dev *adp5585 = dev_get_drvdata(dev);
> +
> + regcache_cache_only(adp5585->regmap, true);
> +
> + return 0;
> +}
> +
> +static int adp5585_resume(struct device *dev)
> +{
> + struct adp5585_dev *adp5585 = dev_get_drvdata(dev);
> +
> + regcache_cache_only(adp5585->regmap, false);
> + regcache_mark_dirty(adp5585->regmap);
> +
> + return regcache_sync(adp5585->regmap);
> +}
> +
> +static DEFINE_SIMPLE_DEV_PM_OPS(adp5585_pm, adp5585_suspend, adp5585_resume);
> +
> +static const struct of_device_id adp5585_of_match[] = {
> + {
> + .compatible = "adi,adp5585-00",
> + .data = &adp5585_regmap_configs[ADP5585_REGMAP_00],
> + }, {
> + .compatible = "adi,adp5585-01",
> + .data = &adp5585_regmap_configs[ADP5585_REGMAP_00],
> + }, {
> + .compatible = "adi,adp5585-02",
> + .data = &adp5585_regmap_configs[ADP5585_REGMAP_02],
> + }, {
> + .compatible = "adi,adp5585-03",
> + .data = &adp5585_regmap_configs[ADP5585_REGMAP_00],
> + }, {
> + .compatible = "adi,adp5585-04",
> + .data = &adp5585_regmap_configs[ADP5585_REGMAP_04],
> + },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, adp5585_of_match);
> +
> +static struct i2c_driver adp5585_i2c_driver = {
> + .driver = {
> + .name = "adp5585",
> + .of_match_table = adp5585_of_match,
> + .pm = pm_sleep_ptr(&adp5585_pm),
> + },
> + .probe = adp5585_i2c_probe,
> +};
> +module_i2c_driver(adp5585_i2c_driver);
> +
> +MODULE_DESCRIPTION("ADP5585 core driver");
> +MODULE_AUTHOR("Haibo Chen <haibo.chen@....com>");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/mfd/adp5585.h b/include/linux/mfd/adp5585.h
> new file mode 100644
> index 000000000000..25025b381c63
> --- /dev/null
> +++ b/include/linux/mfd/adp5585.h
> @@ -0,0 +1,126 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Analog Devices ADP5585 I/O expander, PWM controller and keypad controller
> + *
> + * Copyright 2022 NXP
> + * Copyright 2024 Ideas on Board Oy
> + */
> +
> +#ifndef __LINUX_MFD_ADP5585_H_
> +#define __LINUX_MFD_ADP5585_H_
> +
> +#include <linux/bits.h>
> +
> +#define ADP5585_ID 0x00
> +#define ADP5585_MAN_ID_VALUE 0x20
> +#define ADP5585_MAN_ID_MASK GENMASK(7, 4)
> +#define ADP5585_INT_STATUS 0x01
> +#define ADP5585_STATUS 0x02
> +#define ADP5585_FIFO_1 0x03
> +#define ADP5585_FIFO_2 0x04
> +#define ADP5585_FIFO_3 0x05
> +#define ADP5585_FIFO_4 0x06
> +#define ADP5585_FIFO_5 0x07
> +#define ADP5585_FIFO_6 0x08
> +#define ADP5585_FIFO_7 0x09
> +#define ADP5585_FIFO_8 0x0a
> +#define ADP5585_FIFO_9 0x0b
> +#define ADP5585_FIFO_10 0x0c
> +#define ADP5585_FIFO_11 0x0d
> +#define ADP5585_FIFO_12 0x0e
> +#define ADP5585_FIFO_13 0x0f
> +#define ADP5585_FIFO_14 0x10
> +#define ADP5585_FIFO_15 0x11
> +#define ADP5585_FIFO_16 0x12
> +#define ADP5585_GPI_INT_STAT_A 0x13
> +#define ADP5585_GPI_INT_STAT_B 0x14
> +#define ADP5585_GPI_STATUS_A 0x15
> +#define ADP5585_GPI_STATUS_B 0x16
> +#define ADP5585_RPULL_CONFIG_A 0x17
> +#define ADP5585_RPULL_CONFIG_B 0x18
> +#define ADP5585_RPULL_CONFIG_C 0x19
> +#define ADP5585_RPULL_CONFIG_D 0x1a
> +#define ADP5585_Rx_PULL_CFG_PU_300K 0
> +#define ADP5585_Rx_PULL_CFG_PD_300K 1
> +#define ADP5585_Rx_PULL_CFG_PU_100K 2
> +#define ADP5585_Rx_PULL_CFG_DISABLE 3
> +#define ADP5585_Rx_PULL_CFG_MASK 3
> +#define ADP5585_GPI_INT_LEVEL_A 0x1b
> +#define ADP5585_GPI_INT_LEVEL_B 0x1c
> +#define ADP5585_GPI_EVENT_EN_A 0x1d
> +#define ADP5585_GPI_EVENT_EN_B 0x1e
> +#define ADP5585_GPI_INTERRUPT_EN_A 0x1f
> +#define ADP5585_GPI_INTERRUPT_EN_B 0x20
> +#define ADP5585_DEBOUNCE_DIS_A 0x21
> +#define ADP5585_DEBOUNCE_DIS_B 0x22
> +#define ADP5585_GPO_DATA_OUT_A 0x23
> +#define ADP5585_GPO_DATA_OUT_B 0x24
> +#define ADP5585_GPO_OUT_MODE_A 0x25
> +#define ADP5585_GPO_OUT_MODE_B 0x26
> +#define ADP5585_GPIO_DIRECTION_A 0x27
> +#define ADP5585_GPIO_DIRECTION_B 0x28
> +#define ADP5585_RESET1_EVENT_A 0x29
> +#define ADP5585_RESET1_EVENT_B 0x2a
> +#define ADP5585_RESET1_EVENT_C 0x2b
> +#define ADP5585_RESET2_EVENT_A 0x2c
> +#define ADP5585_RESET2_EVENT_B 0x2d
> +#define ADP5585_RESET_CFG 0x2e
> +#define ADP5585_PWM_OFFT_LOW 0x2f
> +#define ADP5585_PWM_OFFT_HIGH 0x30
> +#define ADP5585_PWM_ONT_LOW 0x31
> +#define ADP5585_PWM_ONT_HIGH 0x32
> +#define ADP5585_PWM_CFG 0x33
> +#define ADP5585_PWM_IN_AND BIT(2)
> +#define ADP5585_PWM_MODE BIT(1)
> +#define ADP5585_PWM_EN BIT(0)
> +#define ADP5585_LOGIC_CFG 0x34
> +#define ADP5585_LOGIC_FF_CFG 0x35
> +#define ADP5585_LOGIC_INT_EVENT_EN 0x36
> +#define ADP5585_POLL_PTIME_CFG 0x37
> +#define ADP5585_PIN_CONFIG_A 0x38
> +#define ADP5585_PIN_CONFIG_B 0x39
> +#define ADP5585_PIN_CONFIG_C 0x3a
> +#define ADP5585_PULL_SELECT BIT(7)
> +#define ADP5585_C4_EXTEND_CFG_GPIO11 (0U << 6)
> +#define ADP5585_C4_EXTEND_CFG_RESET2 (1U << 6)
> +#define ADP5585_C4_EXTEND_CFG_MASK GENMASK(6, 6)
> +#define ADP5585_R4_EXTEND_CFG_GPIO5 (0U << 5)
> +#define ADP5585_R4_EXTEND_CFG_RESET1 (1U << 5)
> +#define ADP5585_R4_EXTEND_CFG_MASK GENMASK(5, 5)
> +#define ADP5585_R3_EXTEND_CFG_GPIO4 (0U << 2)
> +#define ADP5585_R3_EXTEND_CFG_LC (1U << 2)
> +#define ADP5585_R3_EXTEND_CFG_PWM_OUT (2U << 2)
> +#define ADP5585_R3_EXTEND_CFG_MASK GENMASK(3, 2)
> +#define ADP5585_R0_EXTEND_CFG_GPIO1 (0U << 0)
> +#define ADP5585_R0_EXTEND_CFG_LY (1U << 0)
> +#define ADP5585_R0_EXTEND_CFG_MASK GENMASK(0, 0)
> +#define ADP5585_GENERAL_CFG 0x3b
> +#define ADP5585_OSC_EN BIT(7)
> +#define ADP5585_OSC_FREQ_50KHZ (0U << 5)
> +#define ADP5585_OSC_FREQ_100KHZ (1U << 5)
> +#define ADP5585_OSC_FREQ_200KHZ (2U << 5)
> +#define ADP5585_OSC_FREQ_500KHZ (3U << 5)
Is it better
#define ADP5585_OSC_FREQ_500KHZ FIELD_PREP(ADP5585_OSC_FREQ_MASK, 3)
> +#define ADP5585_OSC_FREQ_MASK GENMASK(6, 5)
> +#define ADP5585_INT_CFG BIT(1)
> +#define ADP5585_RST_CFG BIT(0)
> +#define ADP5585_INT_EN 0x3c
> +
> +#define ADP5585_MAX_REG ADP5585_INT_EN
> +
> +/*
> + * Bank 0 covers pins "GPIO 1/R0" to "GPIO 6/R5", numbered 0 to 5 by the
> + * driver, and bank 1 covers pins "GPIO 7/C0" to "GPIO 11/C4", numbered 6 to
> + * 10. Some variants of the ADP5585 don't support "GPIO 6/R5". As the driver
> + * uses identical GPIO numbering for all variants to avoid confusion, GPIO 5 is
> + * marked as reserved in the device tree for variants that don't support it.
> + */
> +#define ADP5585_BANK(n) ((n) >= 6 ? 1 : 0)
> +#define ADP5585_BIT(n) ((n) >= 6 ? BIT((n) - 6) : BIT(n))
> +
> +struct regmap;
> +
> +struct adp5585_dev {
> + struct regmap *regmap;
> +};
> +
> +#endif
> --
> Regards,
>
> Laurent Pinchart
>
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