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drivers: usb_dc_sam: get the maximum speed from DT as enum

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For historical reasons, the maximum speed of the Atmel SAM USB
controller is done by comparing the maximum-speed property string from
the DT using strncmp at runtime.

Now that the DT_ENUM_IDX macro exists, we can use it to get the
maximum-speed property at build time and without string comparison.
Unsupported speed can also be reported at build time.

Note that the default speed in case the optional maximum-speed property
isn't present in the DT is changed from full-speed to high-speed to
match the property description. This is a no-op in practice as this
properties is defined at the soc level.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2020-05-12 23:36:36 +02:00 • committed by Anas Nashif
commit 35adb6e2c4
1 changed files with 15 additions and 17 deletions
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32
drivers/usb/device/usb_dc_sam.c
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@ -47,7 +47,9 @@ LOG_MODULE_REGISTER(usb_dc_sam);
#define NUM_OF_EP_MAX DT_INST_PROP(0, num_bidir_endpoints)
#if DT_INST_NODE_HAS_PROP(0, maximum_speed)
#define USB_MAXIMUM_SPEED DT_INST_PROP(0, maximum_speed)
#define USB_MAXIMUM_SPEED DT_ENUM_IDX(DT_DRV_INST(0), maximum_speed)
#else
#define USB_MAXIMUM_SPEED 2 /* Default to high-speed */
#endif
struct usb_device_ep_data {
@ -310,23 +312,19 @@ int usb_dc_attach(void)
/* Select the speed */
regval = USBHS_DEVCTRL_DETACH;
#ifdef USB_MAXIMUM_SPEED
if (!strncmp(USB_MAXIMUM_SPEED, "high-speed", 10)) {
regval |= USBHS_DEVCTRL_SPDCONF_NORMAL;
} else if (!strncmp(USB_MAXIMUM_SPEED, "full-speed", 10)) {
regval |= USBHS_DEVCTRL_SPDCONF_LOW_POWER;
} else if (!strncmp(USB_MAXIMUM_SPEED, "low-speed", 9)) {
regval |= USBHS_DEVCTRL_LS;
regval |= USBHS_DEVCTRL_SPDCONF_LOW_POWER;
} else {
regval |= USBHS_DEVCTRL_SPDCONF_NORMAL;
LOG_WRN("Unsupported maximum speed defined in device tree. "
"USB controller will default to its maximum HW "
"capability");
}
#else
#if USB_MAXIMUM_SPEED == 0
/* low-speed */
regval |= USBHS_DEVCTRL_LS;
regval |= USBHS_DEVCTRL_SPDCONF_LOW_POWER;
#elif USB_MAXIMUM_SPEED == 1
/* full-speed */
regval |= USBHS_DEVCTRL_SPDCONF_LOW_POWER;
#elif USB_MAXIMUM_SPEED == 2
/* high-speed */
regval |= USBHS_DEVCTRL_SPDCONF_NORMAL;
#endif /* USB_MAXIMUM_SPEED */
#else
#error "Unsupported maximum speed defined in device tree."
#endif
USBHS->USBHS_DEVCTRL = regval;
/* Enable the USB clock */