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Date: Tue, 8 Feb 2022 09:12:03 +0000
From: Lee Jones <lee.jones@...aro.org>
To: Quan Nguyen <quan@...amperecomputing.com>
Cc: Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>,
Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
Rob Herring <robh+dt@...nel.org>,
Jonathan Corbet <corbet@....net>, linux-hwmon@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, linux-aspeed@...ts.ozlabs.org,
openbmc@...ts.ozlabs.org, Mark Brown <broonie@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Derek Kiernan <derek.kiernan@...inx.com>,
Dragan Cvetic <dragan.cvetic@...inx.com>,
Arnd Bergmann <arnd@...db.de>,
Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>,
Open Source Submission <patches@...erecomputing.com>,
Phong Vo <phong@...amperecomputing.com>,
"Thang Q . Nguyen" <thang@...amperecomputing.com>
Subject: Re: [PATCH v6 2/9] mfd: smpro-mfd: Adds Ampere's Altra SMpro MFD
driver
On Fri, 24 Dec 2021, Quan Nguyen wrote:
> Adds Multi-function devices driver for SMpro co-processor found on the
> Mt.Jade hardware reference platform with Ampere's Altra processor family.
>
> Signed-off-by: Quan Nguyen <quan@...amperecomputing.com>
> ---
> Changes in v6:
> + Update license part to reflect that this driver is clone from
> simple-mfd-i2c driver [Quan]
>
> Changes in v5:
> + Dropped the use of simple-mfd-i2c driver [Quan]
> + Introduced drivers/mfd/smpro-mfd.c driver to instantiate
> sub-devices. This is to avoid DT nodes without resource issue [Quan]
> + Revised commit message [Quan]
>
> Changes in v4:
> + Add "depends on I2C" to fix build issue found by kernel test
> robot [Guenter]
>
> Changes in v3:
> + None
>
> Changes in v2:
> + Used 'struct of_device_id's .data attribute [Lee Jones]
>
> drivers/mfd/Kconfig | 12 +++++++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/smpro-mfd.c | 76 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 89 insertions(+)
> create mode 100644 drivers/mfd/smpro-mfd.c
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index a21cbdf89477..a886da5018b1 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -77,6 +77,18 @@ config MFD_AS3711
> help
> Support for the AS3711 PMIC from AMS
>
> +config MFD_SMPRO
> + tristate "Ampere Computing MFD SMpro core driver"
> + depends on I2C
> + select MFD_CORE
> + select REGMAP_I2C
> + help
> + Say yes here to enable SMpro driver support for Ampere's Altra
> + processor family.
> +
> + Ampere's Altra SMpro exposes an I2C regmap interface that can
> + be accessed by child devices.
> +
> config MFD_AS3722
> tristate "ams AS3722 Power Management IC"
> select MFD_CORE
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 4d53e951a92d..fbcd09dce5ce 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -267,6 +267,7 @@ obj-$(CONFIG_MFD_QCOM_PM8008) += qcom-pm8008.o
>
> obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o
> obj-$(CONFIG_MFD_SIMPLE_MFD_I2C) += simple-mfd-i2c.o
> +obj-$(CONFIG_MFD_SMPRO) += smpro-mfd.o
> obj-$(CONFIG_MFD_INTEL_M10_BMC) += intel-m10-bmc.o
>
> obj-$(CONFIG_MFD_ATC260X) += atc260x-core.o
> diff --git a/drivers/mfd/smpro-mfd.c b/drivers/mfd/smpro-mfd.c
> new file mode 100644
> index 000000000000..132d4e2dde12
> --- /dev/null
> +++ b/drivers/mfd/smpro-mfd.c
> @@ -0,0 +1,76 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Ampere Altra Family SMPro MFD - I2C
> + *
> + * Copyright (c) 2021, Ampere Computing LLC
> + * Author: Quan Nguyen <quan@...amperecomputing..com>
> + *
> + * Based on simple-mfd-i2c.c:
Why aren't you just using this?
> + * Copyright (c) by Michael Walle <michael@...le.cc>
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/mfd/core.h>
> +#include <linux/regmap.h>
> +
> +/* Identification Registers */
> +#define MANUFACTURER_ID_REG 0x02
> +#define AMPERE_MANUFACTURER_ID 0xCD3A
> +
> +static const struct regmap_config simple_word_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 16,
> +};
> +
> +static const struct mfd_cell smpro_devs[] = {
> + MFD_CELL_NAME("smpro-hwmon"),
> +};
What are the other devices?
> +static int smpro_mfd_probe(struct i2c_client *i2c)
> +{
> + const struct regmap_config *config;
> + struct regmap *regmap;
> + unsigned int val;
> + int ret;
> +
> + config = device_get_match_data(&i2c->dev);
> + if (!config)
> + config = &simple_word_regmap_config;
> +
> + regmap = devm_regmap_init_i2c(i2c, config);
> + if (IS_ERR(regmap))
> + return PTR_ERR(regmap);
> +
> + /* Check for valid ID */
> + ret = regmap_read(regmap, MANUFACTURER_ID_REG, &val);
> + if (ret)
> + return ret;
> +
> + if (val != AMPERE_MANUFACTURER_ID)
> + return -ENODEV;
> +
> + return devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
> + smpro_devs, ARRAY_SIZE(smpro_devs), NULL, 0, NULL);
> +}
> +
> +static const struct of_device_id smpro_mfd_of_match[] = {
> + { .compatible = "ampere,smpro", .data = &simple_word_regmap_config },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, smpro_mfd_of_match);
> +
> +static struct i2c_driver smpro_mfd_driver = {
> + .probe_new = smpro_mfd_probe,
> + .driver = {
> + .name = "smpro-mfd-i2c",
> + .of_match_table = smpro_mfd_of_match,
> + },
> +};
> +module_i2c_driver(smpro_mfd_driver);
> +
> +MODULE_AUTHOR("Quan Nguyen <quan@...amperecomputing.com>");
> +MODULE_DESCRIPTION("SMPRO MFD - I2C driver");
> +MODULE_LICENSE("GPL v2");
--
Lee Jones [李琼斯]
Principal Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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