linux-kernel - Re: [PATCH v2 7/7] mfd: intel_vuport: Add Intel virtual USB port MFD Driver

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Date:	Tue, 8 Mar 2016 15:50:06 +0800
From:	Lu Baolu <baolu.lu@...ux.intel.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Felipe Balbi <balbi@...nel.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [PATCH v2 7/7] mfd: intel_vuport: Add Intel virtual USB port MFD
 Driver



On 03/08/2016 12:40 PM, Lee Jones wrote:
> On Mon, 07 Mar 2016, Lu Baolu wrote:
>
>> Some Intel platforms have an USB port mux controlled by GPIOs.
>> There's a single ACPI platform device that provides both USB ID
>> extcon device and a USB port mux device. This MFD driver will
>> split the 2 devices for their respective drivers.
>>
>> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
>> Suggested-by: David Cohen <david.a.cohen@...ux.intel.com>
>> Reviewed-by: Felipe Balbi <balbi@...nel.org>
>> Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
>> ---
>>  MAINTAINERS                |  1 +
>>  drivers/mfd/Kconfig        |  8 +++++
>>  drivers/mfd/Makefile       |  1 +
>>  drivers/mfd/intel-vuport.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++
>>  4 files changed, 88 insertions(+)
>>  create mode 100644 drivers/mfd/intel-vuport.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 399cefe..1671a4d 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -11408,6 +11408,7 @@ F:	drivers/usb/mux/intel-mux.c
>>  F:	include/linux/usb/intel-mux.h
>>  F:	drivers/usb/mux/intel-mux-gpio.c
>>  F:	drivers/usb/mux/intel-mux-drcfg.c
>> +F:	drivers/mfd/intel-vuport.c
> Separate patch please.

Sure.

>
>>  USB PRINTER DRIVER (usblp)
>>  M:	Pete Zaitcev <zaitcev@...hat.com>
>> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
>> index 9ca66de..8dd1bf3 100644
>> --- a/drivers/mfd/Kconfig
>> +++ b/drivers/mfd/Kconfig
>> @@ -1534,5 +1534,13 @@ config MFD_VEXPRESS_SYSREG
>>  	  System Registers are the platform configuration block
>>  	  on the ARM Ltd. Versatile Express board.
>>  
>> +config MFD_INTEL_VUPORT
>> +	tristate "Intel virtual USB port controller"
>> +	select MFD_CORE
>> +	depends on X86 && ACPI
>> +	help
>> +	  Say Y here to enable support for Intel dual role port mux
> Either "Intel's" or "the Intel".

I will change it to "Intel's".

>
>> +	  controlled by 3 GPIOs.
>> +
>>  endmenu
>>  endif
>> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
>> index 0f230a6..0ccd107 100644
>> --- a/drivers/mfd/Makefile
>> +++ b/drivers/mfd/Makefile
>> @@ -198,3 +198,4 @@ intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
>>  intel-soc-pmic-$(CONFIG_INTEL_PMC_IPC)	+= intel_soc_pmic_bxtwc.o
>>  obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
>>  obj-$(CONFIG_MFD_MT6397)	+= mt6397-core.o
>> +obj-$(CONFIG_MFD_INTEL_VUPORT)	+= intel-vuport.o
>> diff --git a/drivers/mfd/intel-vuport.c b/drivers/mfd/intel-vuport.c
>> new file mode 100644
>> index 0000000..1371099
>> --- /dev/null
>> +++ b/drivers/mfd/intel-vuport.c
>> @@ -0,0 +1,78 @@
>> +/*
>> + * MFD driver for Intel virtual USB port
>> + *
>> + * Copyright(c) 2016 Intel Corporation.
>> + * Author: Lu Baolu <baolu.lu@...ux.intel.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/acpi.h>
>> +#include <linux/gpio.h>
>> +#include <linux/mfd/core.h>
>> +#include <linux/platform_device.h>
>> +
>> +/* ACPI GPIO Mappings */
>> +static const struct acpi_gpio_params id_gpio = { 0, 0, false };
>> +static const struct acpi_gpio_params vbus_gpio = { 1, 0, false };
>> +static const struct acpi_gpio_params mux_gpio = { 2, 0, false };
>> +static const struct acpi_gpio_mapping acpi_usb_gpios[] = {
>> +	{ "id-gpios", &id_gpio, 1 },
>> +	{ "vbus_en-gpios", &vbus_gpio, 1 },
>> +	{ "usb_mux-gpios", &mux_gpio, 1 },
>> +	{ },
>> +};
>> +
>> +static const struct mfd_cell intel_vuport_mfd_cells[] = {
>> +	{
>> +		.name = "extcon-usb-gpio",
>> +	},
>> +	{
>> +		.name = "intel-mux-gpio",
>> +	},
>> +};
> Please place single line entries on the same line as the '{' and '}'.
>
> As you have above.

Sure.

>
>> +static int vuport_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	int ret;
>> +
>> +	ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), acpi_usb_gpios);
>> +	if (ret)
>> +		return ret;
>> +
>> +	return mfd_add_devices(&pdev->dev, 0, intel_vuport_mfd_cells,
>> +			ARRAY_SIZE(intel_vuport_mfd_cells), NULL, 0,
>> +			NULL);
>> +}
>> +
>> +static int vuport_remove(struct platform_device *pdev)
>> +{
>> +	mfd_remove_devices(&pdev->dev);
>> +	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
>> +
>> +	return 0;
>> +}
>> +
>> +static struct acpi_device_id vuport_acpi_match[] = {
>> +	{ "INT3496" },
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(acpi, vuport_acpi_match);
>> +
>> +static struct platform_driver vuport_driver = {
>> +	.driver = {
>> +		.name = "intel-vuport",
>> +		.acpi_match_table = ACPI_PTR(vuport_acpi_match),
>> +	},
>> +	.probe = vuport_probe,
>> +	.remove = vuport_remove,
>> +};
>> +
>> +module_platform_driver(vuport_driver);
>> +
>> +MODULE_AUTHOR("Lu Baolu <baolu.lu@...ux.intel.com>");
>> +MODULE_DESCRIPTION("Intel virtual USB port");
>> +MODULE_LICENSE("GPL v2");