[PATCH 2/6] usb: add devicetree helpers for determining dr_mode and phy_type

[s.hauer@pengutronix.de (Sascha Hauer)]

On Thu, Jan 31, 2013 at 11:44:21AM +0530, kishon wrote:
> Hi,
> 
> On Wednesday 30 January 2013 08:59 PM, Sascha Hauer wrote:
> >From: Michael Grzeschik <m.grzeschik@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.
> >
> >Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
> >Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
> >Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> >---
> >  drivers/usb/usb-common.c |   69 ++++++++++++++++++++++++++++++++++++++++++++++
> >  include/linux/usb/of.h   |   27 ++++++++++++++++++
> >  include/linux/usb/otg.h  |    7 +++++
> >  include/linux/usb/phy.h  |    9 ++++++
> >  4 files changed, 112 insertions(+)
> >  create mode 100644 include/linux/usb/of.h
> >
> >diff --git a/drivers/usb/usb-common.c b/drivers/usb/usb-common.c
> >index d29503e..1c0292c 100644
> >--- a/drivers/usb/usb-common.c
> >+++ b/drivers/usb/usb-common.c
> >@@ -14,6 +14,9 @@
> >  #include <linux/kernel.h>
> >  #include <linux/module.h>
> >  #include <linux/usb/ch9.h>
> >+#include <linux/of.h>
> >+#include <linux/usb/of.h>
> >+#include <linux/usb/otg.h>
> >
> >  const char *usb_speed_string(enum usb_device_speed speed)
> >  {
> >@@ -32,4 +35,70 @@ const char *usb_speed_string(enum usb_device_speed speed)
> >  }
> >  EXPORT_SYMBOL_GPL(usb_speed_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_phy_dr_mode
> >+ */
> >+enum usb_phy_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 (!strcasecmp(dr_mode, usb_dr_modes[i]))
> >+			return i;
> >+
> >+	return USB_DR_MODE_UNKNOWN;
> >+}
> >+EXPORT_SYMBOL_GPL(of_usb_get_dr_mode);
> >+
> >+static const char *usbphy_modes[] = {
> >+	[USBPHY_INTERFACE_MODE_NA]	= "",
> >+	[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_get_usbphy_mode - Get phy mode for given device_node
> 
> %s/of_get_usbphy_mode/of_usb_get_phy_mode
> >+ * @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)
> >+{
> 
> You agreed to move this function inside usb/phy.. no?

Yes, I did, but as mentioned in the introduction mail, the chipidea
driver has to determine the phy type even when phy support (aka
CONFIG_USB_OTG_UTILS) is disabled, so I can't put it in phy/phy.c.

I could add a phy/of.c though. Would that be better?

Sascha

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