apm821xx: add amcc, usb-otg-405ex devicetree definition

This patch adds support for the amcc,usb-otg-405ex device
which is found in all APM82181 SoCs.
Note: The system can't use the generic "snps,dwc2" compatible
because of the special ahbcfg configuration. The default
GAHBCFG_HBSTLEN_INCR4 of snps,dwc2 can cause a system hang
when the USB and SATA is used concurrently.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/apm821xx/patches-4.4/804-usb-dwc2-add-amcc-usb-otg-405ex.patch

@@ -0,0 +1,44 @@
+--- a/drivers/usb/dwc2/platform.c
++++ b/drivers/usb/dwc2/platform.c
+@@ -115,6 +115,37 @@ static const struct dwc2_core_params par
+ 	.hibernation			= -1,
+ };
+
++static const struct dwc2_core_params params_amcc_dwc_otg = {
++	.otg_cap			= DWC2_CAP_PARAM_HNP_SRP_CAPABLE,
++	.otg_ver			= -1,
++	.dma_enable			= -1,
++	.dma_desc_enable		= -1,
++	.speed				= -1,
++	.enable_dynamic_fifo		= -1,
++	.en_multiple_tx_fifo		= -1,
++	.host_rx_fifo_size		= -1,
++	.host_nperio_tx_fifo_size	= -1,
++	.host_perio_tx_fifo_size	= -1,
++	.max_transfer_size		= -1,
++	.max_packet_count		= -1,
++	.host_channels			= -1,
++	.phy_type			= -1,
++	.phy_utmi_width			= -1,
++	.phy_ulpi_ddr			= -1,
++	.phy_ulpi_ext_vbus		= -1,
++	.i2c_enable			= -1,
++	.ulpi_fs_ls			= -1,
++	.host_support_fs_ls_low_power	= -1,
++	.host_ls_low_power_phy_clk	= -1,
++	.ts_dline			= -1,
++	.reload_ctl			= -1,
++	.ahbcfg				= GAHBCFG_HBSTLEN_INCR16 <<
++					  GAHBCFG_HBSTLEN_SHIFT,
++	.uframe_sched			= -1,
++	.external_id_pin_ctl		= -1,
++	.hibernation			= -1,
++};
++
+ static int __dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
+ {
+ 	struct platform_device *pdev = to_platform_device(hsotg->dev);
+@@ -309,2 +340,3 @@ static int dwc2_driver_remove(struct pla
+ static const struct of_device_id dwc2_of_match_table[] = {
++	{ .compatible = "amcc,usb-otg-405ex", .data = &params_amcc_dwc_otg },
+ 	{ .compatible = "brcm,bcm2835-usb", .data = &params_bcm2835 },