[PATCH 1/7] USB: add devicetree helpers for determining dr_mode and phy_type
Michael Grzeschik
mgr at pengutronix.de
Tue Jun 4 23:01:40 EST 2013
On Mon, Jun 03, 2013 at 03:32:50PM +0300, Alexander Shishkin wrote:
> Michael Grzeschik <mgr at pengutronix.de> writes:
>
> > From: Michael Grzeschik <m.grzeschik at pengutronix.de>
> >
> > This adds two little devicetree helper functions for determining the
> > dr_mode (host, peripheral, otg) and phy_type (utmi, ulpi,...) from
> > the devicetree.
>
> This one needs an ack from Felipe.
Right, we currently also wait for his answer in another thread.
http://www.spinics.net/lists/linux-usb/msg86906.html
> > Signed-off-by: Michael Grzeschik <m.grzeschik at pengutronix.de>
> > Signed-off-by: Marc Kleine-Budde <mkl at pengutronix.de>
> > Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
> > ---
> > drivers/usb/phy/Makefile | 1 +
> > drivers/usb/phy/of.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
> > drivers/usb/usb-common.c | 35 +++++++++++++++++++++++++++++++++++
> > include/linux/usb/of.h | 28 ++++++++++++++++++++++++++++
> > include/linux/usb/otg.h | 7 +++++++
> > include/linux/usb/phy.h | 9 +++++++++
> > 6 files changed, 127 insertions(+)
> > create mode 100644 drivers/usb/phy/of.c
> > create mode 100644 include/linux/usb/of.h
> >
> > diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
> > index a9169cb..070eca3 100644
> > --- a/drivers/usb/phy/Makefile
> > +++ b/drivers/usb/phy/Makefile
> > @@ -5,6 +5,7 @@
> > ccflags-$(CONFIG_USB_DEBUG) := -DDEBUG
> >
> > obj-$(CONFIG_USB_PHY) += phy.o
> > +obj-$(CONFIG_OF) += of.o
> >
> > # transceiver drivers, keep the list sorted
> >
> > diff --git a/drivers/usb/phy/of.c b/drivers/usb/phy/of.c
> > new file mode 100644
> > index 0000000..e6f3b74
> > --- /dev/null
> > +++ b/drivers/usb/phy/of.c
> > @@ -0,0 +1,47 @@
> > +/*
> > + * USB of helper code
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License as published by
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/usb/of.h>
> > +#include <linux/usb/otg.h>
> > +
> > +static const char *usbphy_modes[] = {
> > + [USBPHY_INTERFACE_MODE_UNKNOWN] = "",
> > + [USBPHY_INTERFACE_MODE_UTMI] = "utmi",
> > + [USBPHY_INTERFACE_MODE_UTMIW] = "utmi_wide",
> > + [USBPHY_INTERFACE_MODE_ULPI] = "ulpi",
> > + [USBPHY_INTERFACE_MODE_SERIAL] = "serial",
> > + [USBPHY_INTERFACE_MODE_HSIC] = "hsic",
> > +};
> > +
> > +/**
> > + * of_usb_get_phy_mode - Get phy mode for given device_node
> > + * @np: Pointer to the given device_node
> > + *
> > + * The function gets phy interface string from property 'phy_type',
> > + * and returns the correspondig enum usb_phy_interface
> > + */
> > +enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np)
> > +{
> > + const char *phy_type;
> > + int err, i;
> > +
> > + err = of_property_read_string(np, "phy_type", &phy_type);
> > + if (err < 0)
> > + return USBPHY_INTERFACE_MODE_UNKNOWN;
> > +
> > + for (i = 0; i < ARRAY_SIZE(usbphy_modes); i++)
> > + if (!strcmp(phy_type, usbphy_modes[i]))
> > + return i;
> > +
> > + return USBPHY_INTERFACE_MODE_UNKNOWN;
> > +}
> > +EXPORT_SYMBOL_GPL(of_usb_get_phy_mode);
> > diff --git a/drivers/usb/usb-common.c b/drivers/usb/usb-common.c
> > index 0db0a91..027582d 100644
> > --- a/drivers/usb/usb-common.c
> > +++ b/drivers/usb/usb-common.c
> > @@ -13,7 +13,9 @@
> >
> > #include <linux/kernel.h>
> > #include <linux/module.h>
> > +#include <linux/of.h>
> > #include <linux/usb/ch9.h>
> > +#include <linux/usb/of.h>
> > #include <linux/usb/otg.h>
> >
> > const char *usb_otg_state_string(enum usb_otg_state state)
> > @@ -79,4 +81,37 @@ const char *usb_state_string(enum usb_device_state state)
> > }
> > EXPORT_SYMBOL_GPL(usb_state_string);
> >
> > +#ifdef CONFIG_OF
> > +static const char *usb_dr_modes[] = {
> > + [USB_DR_MODE_UNKNOWN] = "",
> > + [USB_DR_MODE_HOST] = "host",
> > + [USB_DR_MODE_PERIPHERAL] = "peripheral",
> > + [USB_DR_MODE_OTG] = "otg",
> > +};
> > +
> > +/**
> > + * of_usb_get_dr_mode - Get dual role mode for given device_node
> > + * @np: Pointer to the given device_node
> > + *
> > + * The function gets phy interface string from property 'dr_mode',
> > + * and returns the correspondig enum usb_dr_mode
> > + */
> > +enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
> > +{
> > + const char *dr_mode;
> > + int err, i;
> > +
> > + err = of_property_read_string(np, "dr_mode", &dr_mode);
> > + if (err < 0)
> > + return USB_DR_MODE_UNKNOWN;
> > +
> > + for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
> > + if (!strcmp(dr_mode, usb_dr_modes[i]))
> > + return i;
> > +
> > + return USB_DR_MODE_UNKNOWN;
> > +}
> > +EXPORT_SYMBOL_GPL(of_usb_get_dr_mode);
> > +#endif
> > +
> > MODULE_LICENSE("GPL");
> > diff --git a/include/linux/usb/of.h b/include/linux/usb/of.h
> > new file mode 100644
> > index 0000000..e460a24
> > --- /dev/null
> > +++ b/include/linux/usb/of.h
> > @@ -0,0 +1,28 @@
> > +/*
> > + * OF helpers for usb devices.
> > + *
> > + * This file is released under the GPLv2
> > + */
> > +
> > +#ifndef __LINUX_USB_OF_H
> > +#define __LINUX_USB_OF_H
> > +
> > +#include <linux/usb/otg.h>
> > +#include <linux/usb/phy.h>
> > +
> > +#ifdef CONFIG_OF
> > +enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np);
> > +enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np);
> > +#else
> > +static inline enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np)
> > +{
> > + return USBPHY_INTERFACE_MODE_UNKNOWN;
> > +}
> > +
> > +static inline enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
> > +{
> > + return USB_DR_MODE_UNKNOWN;
> > +}
> > +#endif
> > +
> > +#endif /* __LINUX_USB_OF_H */
> > diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
> > index 291e01b..154332b 100644
> > --- a/include/linux/usb/otg.h
> > +++ b/include/linux/usb/otg.h
> > @@ -92,4 +92,11 @@ otg_start_srp(struct usb_otg *otg)
> > /* for OTG controller drivers (and maybe other stuff) */
> > extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
> >
> > +enum usb_dr_mode {
> > + USB_DR_MODE_UNKNOWN,
> > + USB_DR_MODE_HOST,
> > + USB_DR_MODE_PERIPHERAL,
> > + USB_DR_MODE_OTG,
> > +};
> > +
>
> I would suggest turning this into a bitmask, so that further tests look
> like
>
> if (dr_mode & USB_DR_MODE_HOST) {...}
>
> instead of how they currently look like in the other patch.
You mean 32 modes will be enough? :)
These helpers are derived from drivers/of/of_net.c. Its enums are
commonly used all over the kernel. We should align to already used
coding patterns. I also prefer to switch over an enum than compare bits.
Thanks,
Michael
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