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Subject: Re: [PATCH v2 1/2] hwmon: pmbus: adm1266: add support
To:     alexandru.tachici@analog.com, linux-hwmon@vger.kernel.org,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
Cc:     robh+dt@kernel.org
References: <20200325130605.2420-1-alexandru.tachici@analog.com>
 <20200325130605.2420-2-alexandru.tachici@analog.com>
From:   Guenter Roeck <linux@roeck-us.net>
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Message-ID: <742d3220-7a2c-d0a7-d286-7f71a5e78511@roeck-us.net>
Date:   Wed, 25 Mar 2020 06:58:15 -0700
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Sender: linux-kernel-owner@vger.kernel.org
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Hi,

On 3/25/20 6:06 AM, alexandru.tachici@analog.com wrote:
> From: Alexandru Tachici <alexandru.tachici@analog.com>
> 
> Add pmbus probing driver for the adm1266 Cascadable
> Super Sequencer with Margin Control and Fault Recording.
> Driver is using the pmbus_core, creating sysfs files
> under hwmon for inputs: vh1->vh4 and vp1->vp13.
> 
> Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>

It looks like the driver is reduced to just standard functionality.
Can you try just adding the device ID to pmbus.c ?

Thanks,
Guenter

> ---
>  Documentation/hwmon/adm1266.rst | 35 +++++++++++++++++++
>  drivers/hwmon/pmbus/Kconfig     |  9 +++++
>  drivers/hwmon/pmbus/Makefile    |  1 +
>  drivers/hwmon/pmbus/adm1266.c   | 62 +++++++++++++++++++++++++++++++++
>  4 files changed, 107 insertions(+)
>  create mode 100644 Documentation/hwmon/adm1266.rst
>  create mode 100644 drivers/hwmon/pmbus/adm1266.c
> 
> diff --git a/Documentation/hwmon/adm1266.rst b/Documentation/hwmon/adm1266.rst
> new file mode 100644
> index 000000000000..65662115750c
> --- /dev/null
> +++ b/Documentation/hwmon/adm1266.rst
> @@ -0,0 +1,35 @@
> +Kernel driver adm1266
> +=====================
> +
> +Supported chips:
> +  * Analog Devices ADM1266
> +    Prefix: 'adm1266'
> +    Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADM1266.pdf
> +
> +Author: Alexandru Tachici <alexandru.tachici@analog.com>
> +
> +
> +Description
> +-----------
> +
> +This driver supports hardware monitoring for Analog Devices ADM1266 sequencer.
> +
> +ADM1266 is a sequencer that features voltage readback from 17 channels via an
> +integrated 12 bit SAR ADC, accessed using a PMBus interface.
> +
> +The driver is a client driver to the core PMBus driver. Please see
> +Documentation/hwmon/pmbus for details on PMBus client drivers.
> +
> +
> +Sysfs entries
> +-------------
> +
> +The following attributes are supported. Limits are read-write, history reset
> +attributes are write-only, all other attributes are read-only.
> +
> +inX_label		"voutx"
> +inX_input		Measured voltage.
> +inX_min			Minimum Voltage.
> +inX_max			Maximum voltage.
> +inX_min_alarm		Voltage low alarm.
> +inX_max_alarm		Voltage high alarm.
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index a9ea06204767..3096e46e2212 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -26,6 +26,15 @@ config SENSORS_PMBUS
>  	  This driver can also be built as a module. If so, the module will
>  	  be called pmbus.
>  
> +config SENSORS_ADM1266
> +	tristate "Analog Devices ADM1266"
> +	help
> +	  If you say yes here you get hardware monitoring support for Analog
> +	  Devices ADM1266 Cascadable Super Sequencer.
> +
> +	  This driver can also be built as a module. If so, the module will
> +	  be called adm1266.
> +
>  config SENSORS_ADM1275
>  	tristate "Analog Devices ADM1275 and compatibles"
>  	help
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index 5feb45806123..ed38f6d6f845 100644
> --- a/drivers/hwmon/pmbus/Makefile
> +++ b/drivers/hwmon/pmbus/Makefile
> @@ -5,6 +5,7 @@
>  
>  obj-$(CONFIG_PMBUS)		+= pmbus_core.o
>  obj-$(CONFIG_SENSORS_PMBUS)	+= pmbus.o
> +obj-$(CONFIG_SENSORS_ADM1266)	+= adm1266.o
>  obj-$(CONFIG_SENSORS_ADM1275)	+= adm1275.o
>  obj-$(CONFIG_SENSORS_BEL_PFE)	+= bel-pfe.o
>  obj-$(CONFIG_SENSORS_IBM_CFFPS)	+= ibm-cffps.o
> diff --git a/drivers/hwmon/pmbus/adm1266.c b/drivers/hwmon/pmbus/adm1266.c
> new file mode 100644
> index 000000000000..c1df21d564f3
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/adm1266.c
> @@ -0,0 +1,62 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * ADM1266 - Cascadable Super Sequencer with Margin
> + * Control and Fault Recording
> + *
> + * Copyright 2020 Analog Devices Inc.
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +
> +#include "pmbus.h"
> +
> +static int adm1266_probe(struct i2c_client *client,
> +			 const struct i2c_device_id *id)
> +{
> +	struct pmbus_driver_info *info;
> +	u32 funcs;
> +	int i;
> +
> +	info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
> +			    GFP_KERNEL);
> +
> +	info->pages = 17;
> +	info->format[PSC_VOLTAGE_OUT] = linear;
> +	funcs = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
> +	for (i = 0; i < info->pages; i++)
> +		info->func[i] = funcs;
> +
> +	return pmbus_do_probe(client, id, info);
> +}
> +
> +static const struct of_device_id adm1266_of_match[] = {
> +	{ .compatible = "adi,adm1266" },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, adm1266_of_match);
> +
> +static const struct i2c_device_id adm1266_id[] = {
> +	{ "adm1266", 0 },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(i2c, adm1266_id);
> +
> +static struct i2c_driver adm1266_driver = {
> +	.driver = {
> +		   .name = "adm1266",
> +		   .of_match_table = adm1266_of_match,
> +		  },
> +	.probe = adm1266_probe,
> +	.remove = pmbus_do_remove,
> +	.id_table = adm1266_id,
> +};
> +
> +module_i2c_driver(adm1266_driver);
> +
> +MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@analog.com>");
> +MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1266");
> +MODULE_LICENSE("GPL v2");
>