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Date: Tue, 20 Jul 2021 15:53:25 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Alistair Francis <alistair@...stair23.me>
Cc: robh+dt@...nel.org, lgirdwood@...il.com, broonie@...nel.org,
linux-imx@....com, kernel@...gutronix.de,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
alistair23@...il.com
Subject: Re: [PATCH v7 1/6] mfd: sy7636a: Initial commit
On Thu, 08 Jul 2021, Alistair Francis wrote:
> Initial support for the Silergy SY7636A Power Management chip.
>
> Signed-off-by: Alistair Francis <alistair@...stair23.me>
> ---
> drivers/mfd/Kconfig | 9 +++++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/sy7636a.c | 81 +++++++++++++++++++++++++++++++++++++
> include/linux/mfd/sy7636a.h | 47 +++++++++++++++++++++
> 4 files changed, 138 insertions(+)
> create mode 100644 drivers/mfd/sy7636a.c
> create mode 100644 include/linux/mfd/sy7636a.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 6a3fd2d75f96..7b59aa0fd3f2 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1352,6 +1352,15 @@ config MFD_SYSCON
> Select this option to enable accessing system control registers
> via regmap.
>
> +config MFD_SY7636A
> + tristate "Silergy SY7636A Power Management chip"
s/chip/IC/
> + select MFD_CORE
> + select REGMAP_I2C
> + depends on I2C
> + help
> + Select this option to enable support for the Silergy SY7636A
> + Power Management chip.
As above.
> config MFD_DAVINCI_VOICECODEC
> tristate
> select MFD_CORE
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 8116c19d5fd4..cbe581e87fa9 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -266,6 +266,7 @@ obj-$(CONFIG_MFD_KHADAS_MCU) += khadas-mcu.o
> obj-$(CONFIG_MFD_ACER_A500_EC) += acer-ec-a500.o
> obj-$(CONFIG_MFD_QCOM_PM8008) += qcom-pm8008.o
>
> +obj-$(CONFIG_MFD_SY7636A) += sy7636a.o
> obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o
> obj-$(CONFIG_MFD_SIMPLE_MFD_I2C) += simple-mfd-i2c.o
> obj-$(CONFIG_MFD_INTEL_M10_BMC) += intel-m10-bmc.o
> diff --git a/drivers/mfd/sy7636a.c b/drivers/mfd/sy7636a.c
> new file mode 100644
> index 000000000000..345892e11221
> --- /dev/null
> +++ b/drivers/mfd/sy7636a.c
> @@ -0,0 +1,81 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +//
> +// MFD parent driver for SY7636A chip
> +//
> +// Copyright (C) 2021 reMarkable AS - http://www.remarkable.com/
> +//
> +// Authors: Lars Ivar Miljeteig <lars.ivar.miljeteig@...arkable.com>
> +// Alistair Francis <alistair@...stair23.me>
Only C++ comments for the SPDX please.
> +// Based on the lp87565 driver by Keerthy <j-keerthy@...com>
> +
> +#include <linux/interrupt.h>
> +#include <linux/mfd/core.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +
> +#include <linux/mfd/sy7636a.h>
> +
> +static const struct regmap_config sy7636a_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> +};
> +
> +static const struct mfd_cell sy7636a_cells[] = {
> + { .name = "sy7636a-regulator", },
> + { .name = "sy7636a-temperature", },
> + { .name = "sy7636a-thermal", },
> +};
If you put these in the Device Tree, you can use "simple-mfd-i2c"
> +static const struct of_device_id of_sy7636a_match_table[] = {
> + { .compatible = "silergy,sy7636a", },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, of_sy7636a_match_table);
Place this near the i2c_device_id table please.
> +static int sy7636a_probe(struct i2c_client *client,
> + const struct i2c_device_id *ids)
> +{
> + struct sy7636a *sy7636a;
Please call this ddata.
> + int ret;
> +
> + sy7636a = devm_kzalloc(&client->dev, sizeof(*sy7636a), GFP_KERNEL);
> + if (!sy7636a)
> + return -ENOMEM;
> +
> + sy7636a->dev = &client->dev;
What are you using 'dev' for?
You can normally just use 'dev->parent' from the child device.
> + sy7636a->regmap = devm_regmap_init_i2c(client, &sy7636a_regmap_config);
> + if (IS_ERR(sy7636a->regmap)) {
> + ret = PTR_ERR(sy7636a->regmap);
> + dev_err(sy7636a->dev,
> + "Failed to initialize register map: %d\n", ret);
> + return ret;
> + }
> +
> + i2c_set_clientdata(client, sy7636a);
> +
> + return devm_mfd_add_devices(sy7636a->dev, PLATFORM_DEVID_AUTO,
> + sy7636a_cells, ARRAY_SIZE(sy7636a_cells),
> + NULL, 0, NULL);
> +}
> +
> +static const struct i2c_device_id sy7636a_id_table[] = {
> + { "sy7636a", 0 },
> + { },
> +};
> +MODULE_DEVICE_TABLE(i2c, sy7636a_id_table);
Use probe_new below, then you can omit this table.
> +static struct i2c_driver sy7636a_driver = {
> + .driver = {
> + .name = "sy7636a",
> + .of_match_table = of_sy7636a_match_table,
> + },
> + .probe = sy7636a_probe,
> + .id_table = sy7636a_id_table,
> +};
> +module_i2c_driver(sy7636a_driver);
> +
> +MODULE_AUTHOR("Lars Ivar Miljeteig <lars.ivar.miljeteig@...arkable.com>");
> +MODULE_DESCRIPTION("Silergy SY7636A Multi-Function Device Driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/mfd/sy7636a.h b/include/linux/mfd/sy7636a.h
> new file mode 100644
> index 000000000000..b6845a3572b8
> --- /dev/null
> +++ b/include/linux/mfd/sy7636a.h
> @@ -0,0 +1,47 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Functions to access SY3686A power management chip.
> + *
> + * Copyright (C) 2021 reMarkable AS - http://www.remarkable.com/
> + */
> +
> +#ifndef __MFD_SY7636A_H
> +#define __MFD_SY7636A_H
> +
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/driver.h>
> +#include <linux/regulator/machine.h>
> +
> +#define SY7636A_REG_OPERATION_MODE_CRL 0x00
> +#define SY7636A_OPERATION_MODE_CRL_VCOMCTL BIT(6)
> +#define SY7636A_OPERATION_MODE_CRL_ONOFF BIT(7)
> +#define SY7636A_REG_VCOM_ADJUST_CTRL_L 0x01
> +#define SY7636A_REG_VCOM_ADJUST_CTRL_H 0x02
> +#define SY7636A_REG_VCOM_ADJUST_CTRL_MASK 0x01ff
> +#define SY7636A_REG_VLDO_VOLTAGE_ADJULST_CTRL 0x03
> +#define SY7636A_REG_POWER_ON_DELAY_TIME 0x06
> +#define SY7636A_REG_FAULT_FLAG 0x07
> +#define SY7636A_FAULT_FLAG_PG BIT(0)
> +#define SY7636A_REG_TERMISTOR_READOUT 0x08
> +
> +#define SY7636A_REG_MAX 0x08
> +
> +#define VCOM_MIN 0
> +#define VCOM_MAX 5000
> +
> +#define VCOM_ADJUST_CTRL_MASK 0x1ff
> +// Used to shift the high byte
> +#define VCOM_ADJUST_CTRL_SHIFT 8
> +// Used to scale from VCOM_ADJUST_CTRL to mv
> +#define VCOM_ADJUST_CTRL_SCAL 10000
> +
> +#define FAULT_FLAG_SHIFT 1
> +
> +struct sy7636a {
> + struct device *dev;
> + struct regmap *regmap;
> + struct gpio_desc *pgood_gpio;
This looks unused?
> +};
> +
> +#endif /* __LINUX_MFD_SY7636A_H */
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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