linux-kernel - Re: [PATCH v8 5/7] mfd: intel_vuport: Add Intel virtual USB port MFD Driver

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Date:	Mon, 9 May 2016 15:26:30 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Lu Baolu <baolu.lu@...ux.intel.com>
Cc:	felipe.balbi@...ux.intel.com,
	Mathias Nyman <mathias.nyman@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 5/7] mfd: intel_vuport: Add Intel virtual USB port MFD
 Driver

On Thu, 05 May 2016, Lu Baolu wrote:

> Some Intel platforms have an USB port mux controlled by GPIOs.
> There's a single ACPI platform device that provides 1) USB ID
> extcon device; 2) USB vbus regulator device; and 3) USB port
> switch device. This MFD driver will split these 3 devices for
> their respective drivers.
> 
> [baolu: removed .owner per platform_no_drv_owner.cocci]
> Suggested-by: David Cohen <david.a.cohen@...ux.intel.com>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Reviewed-by: Felipe Balbi <balbi@...nel.org>
> ---
>  drivers/mfd/Kconfig        |  8 +++++
>  drivers/mfd/Makefile       |  1 +
>  drivers/mfd/intel-vuport.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 98 insertions(+)
>  create mode 100644 drivers/mfd/intel-vuport.c

Acked-by: Lee Jones <lee.jones@...aro.org>

> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index eea61e3..7e115ab 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1578,5 +1578,13 @@ 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's dual role port mux
> +	  controlled by GPIOs.
> +
>  endmenu
>  endif
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 5eaa6465d..65b0518 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -203,3 +203,4 @@ 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..fa84ed7
> --- /dev/null
> +++ b/drivers/mfd/intel-vuport.c
> @@ -0,0 +1,89 @@
> +/*
> + * 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/property.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 },
> +	{ "gpio-gpios", &vbus_gpio, 1 },
> +	{ "usb_mux-gpios", &mux_gpio, 1 },
> +	{ },
> +};
> +
> +static struct property_entry reg_properties[] = {
> +	PROPERTY_ENTRY_STRING("supply-name", "regulator-usb-gpio"),
> +	{ },
> +};
> +
> +static const struct property_set reg_properties_pset = {
> +	.properties = reg_properties,
> +};
> +
> +static const struct mfd_cell intel_vuport_mfd_cells[] = {
> +	{ .name = "extcon-usb-gpio", },
> +	{
> +		.name = "reg-fixed-voltage",
> +		.pset = &reg_properties_pset,
> +	},
> +	{ .name = "intel-mux-gpio", },
> +};
> +
> +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, PLATFORM_DEVID_NONE,
> +				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");

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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