Hi,
On Tuesday 29 January 2013 04:52 PM, Sascha Hauer wrote:
From: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
---
The properties and their values have been taken from the fsl-mph-dr driver.
This binding is also documented (though currently not used) for the tegra
ehci driver (Documentation/devicetree/bindings/usb/nvidia,tegra20-ehci.txt).
This is a first attempt to parse these bindings at a common place so that
others can make use of it.
Basically I want to know whether this binding is recommended for new drivers
since normally the devicetree uses '-' instead of '_', and maybe there are
other problems with it.
I need this binding for the chipidea driver. I suspect that the fsl-mph-dr
driver also really handles a chipidea core.
Should we agree on this I would convert the fsl-mph-dr driver to use these
helpers.
Sascha
drivers/usb/core/Makefile | 1 +
drivers/usb/core/of.c | 76 +++++++++++++++++++++++++++++++++++++++++++++
This file should ideally go into drivers/usb/phy/.
include/linux/usb/of.h | 22 +++++++++++++
include/linux/usb/phy.h | 9 ++++++
4 files changed, 108 insertions(+)
create mode 100644 drivers/usb/core/of.c
create mode 100644 include/linux/usb/of.h
diff --git a/drivers/usb/core/Makefile b/drivers/usb/core/Makefile
index 26059b9..5378add 100644
--- a/drivers/usb/core/Makefile
+++ b/drivers/usb/core/Makefile
@@ -10,5 +10,6 @@ usbcore-y += devio.o notify.o generic.o quirks.o devices.o
usbcore-$(CONFIG_PCI) += hcd-pci.o
usbcore-$(CONFIG_ACPI) += usb-acpi.o
+usbcore-$(CONFIG_OF) += of.o
No Kconfig? Shouldn't this file be compiled only when some one is going
to use the PHY?
obj-$(CONFIG_USB) += usbcore.o
diff --git a/drivers/usb/core/of.c b/drivers/usb/core/of.c
new file mode 100644
index 0000000..d000d9f
--- /dev/null
+++ b/drivers/usb/core/of.c
@@ -0,0 +1,76 @@
+/*
+ * OF helpers for usb devices.
+ *
+ * This file is released under the GPLv2
+ *
+ * Initially copied out of drivers/of/of_net.c
+ */
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/usb/of.h>
+#include <linux/usb/phy.h>
+#include <linux/export.h>
+
+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
+ * @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_NA;
Why don't we use a u32 property type for the *phy-type*? IMHO we should
use string property only when the property should be absolutely
unambiguous (e.g., compatible property should be string).
+
+ for (i = 0; i < ARRAY_SIZE(usbphy_modes); i++)
+ if (!strcasecmp(phy_type, usbphy_modes[i]))
+ return i;
+
+ return USBPHY_INTERFACE_MODE_NA;
+}
+EXPORT_SYMBOL_GPL(of_usb_get_phy_mode);
+
+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;
Same comment applies here too.
Thanks
Kishon
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