linux-kernel - RE: [PATCH v5] extcon-axp288: Add axp288 extcon driver support

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Message-ID: <D854C92F57B1B347B57E531E78D05EAD57822173@BGSMSX104.gar.corp.intel.com>
Date:	Tue, 28 Apr 2015 10:10:12 +0000
From:	"Pallala, Ramakrishna" <ramakrishna.pallala@...el.com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Chanwoo Choi" <cw00.choi@...sung.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	"Jacob Pan" <jacob.jun.pan@...ux.intel.com>
Subject: RE: [PATCH v5] extcon-axp288: Add axp288 extcon driver support

> > This patch adds the extcon support for AXP288 PMIC which has the BC1.2
> > charger detection capability. Additionally it also adds the USB mux
> > switching support b/w SOC and PMIC based on GPIO control.
> >
> > Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@...el.com>
> > ---
> >  drivers/extcon/Kconfig         |    7 +
> >  drivers/extcon/Makefile        |    1 +
> >  drivers/extcon/extcon-axp288.c |  399
> ++++++++++++++++++++++++++++++++++++++++
> >  include/linux/mfd/axp20x.h     |    9 +
> >  4 files changed, 416 insertions(+)
> >  create mode 100644 drivers/extcon/extcon-axp288.c
> >
> > diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig index
> > fdc0bf0..2305edc 100644
> > --- a/drivers/extcon/Kconfig
> > +++ b/drivers/extcon/Kconfig
> > @@ -28,6 +28,13 @@ config EXTCON_ARIZONA
> >  	  with Wolfson Arizona devices. These are audio CODECs with
> >  	  advanced audio accessory detection support.
> >
> > +config EXTCON_AXP288
> > +	tristate "X-Power AXP288 EXTCON support"
> > +	depends on MFD_AXP20X && USB_PHY
> > +	help
> > +	  Say Y here to enable support for USB peripheral detection
> > +	  and USB MUX switching by X-Power AXP288 PMIC.
> > +
> >  config EXTCON_GPIO
> >  	tristate "GPIO extcon support"
> >  	depends on GPIOLIB
> > diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile index
> > 9204114..ba787d0 100644
> > --- a/drivers/extcon/Makefile
> > +++ b/drivers/extcon/Makefile
> > @@ -5,6 +5,7 @@
> >  obj-$(CONFIG_EXTCON)		+= extcon.o
> >  obj-$(CONFIG_EXTCON_ADC_JACK)	+= extcon-adc-jack.o
> >  obj-$(CONFIG_EXTCON_ARIZONA)	+= extcon-arizona.o
> > +obj-$(CONFIG_EXTCON_AXP288)	+= extcon-axp288.o
> >  obj-$(CONFIG_EXTCON_GPIO)	+= extcon-gpio.o
> >  obj-$(CONFIG_EXTCON_MAX14577)	+= extcon-max14577.o
> >  obj-$(CONFIG_EXTCON_MAX77693)	+= extcon-max77693.o
> > diff --git a/drivers/extcon/extcon-axp288.c
> > b/drivers/extcon/extcon-axp288.c new file mode 100644 index
> > 0000000..91d764c
> > --- /dev/null
> > +++ b/drivers/extcon/extcon-axp288.c
> > @@ -0,0 +1,399 @@
> > +/*
> > + * extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection
> > +driver
> > + *
> > + * Copyright (C) 2014 Intel Corporation
> > + * Author: Ramakrishna Pallala <ramakrishna.pallala@...el.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.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#include <linux/module.h>
> > +#include <linux/kernel.h>
> > +#include <linux/io.h>
> > +#include <linux/slab.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/property.h>
> > +#include <linux/usb/phy.h>
> > +#include <linux/notifier.h>
> > +#include <linux/extcon.h>
> > +#include <linux/regmap.h>
> > +#include <linux/gpio.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/mfd/axp20x.h>

[snip]

> > +module_platform_driver(axp288_extcon_driver);
> > +
> > +MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@...el.com>");
> > +MODULE_DESCRIPTION("X-Powers AXP288 extcon driver");
> > +MODULE_LICENSE("GPL v2");
> > diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h
> > index dfabd6d..81152e2 100644
> > --- a/include/linux/mfd/axp20x.h
> > +++ b/include/linux/mfd/axp20x.h
> > @@ -275,4 +275,13 @@ struct axp20x_fg_pdata {
> >  	int thermistor_curve[MAX_THERM_CURVE_SIZE][2];
> >  };
> >
> > +#define AXP288_EXTCON_CABLE_SDP		"SLOW-CHARGER"
> > +#define AXP288_EXTCON_CABLE_CDP		"CHARGE-
> DOWNSTREAM"
> > +#define AXP288_EXTCON_CABLE_DCP		"FAST-CHARGER"
> 
> #defines are meant to make things *easier* for humans to read. It is my opinion
> that these negatively impact the readability of the code.
These macros will be used in extcon and charger drivers. How can I make it more readable?

> > +struct axp288_extcon_pdata {
> > +	/* GPIO pin control to switch D+/D- lines b/w PMIC and SOC */
> > +	struct gpio_desc *gpio_mux_cntl;
> > +};
> 
> Are you going to add to this?
Yes, this is needed.

Thanks,
Ram