usb: dwc3: Add dwc3_of_parse() to get quirks information from DT

Add a new function that read quirk and configuration information from the
DT. The goal is to allow platforms using their own version of DWC3 driver
to migrate to the generic DWC3 driver.
The function is adapted from the function dwc3_get_properties() in the
linux dwc3 driver introduced in commit c5ac6116db35d.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index bb3f9d2fc82e0e7043ead21589bd0792ca7358e5..5fe5bfae0ed05b88cbc0ccd7eb73e8cc86f25baf 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -888,6 +888,71 @@ int dwc3_shutdown_phy(struct udevice *dev, struct phy *usb_phys, int num_phys)
 #endif
 
 #if CONFIG_IS_ENABLED(DM_USB)
+void dwc3_of_parse(struct dwc3 *dwc)
+{
+       const u8 *tmp;
+       struct udevice *dev = dwc->dev;
+       u8 lpm_nyet_threshold;
+       u8 tx_de_emphasis;
+       u8 hird_threshold;
+
+       /* default to highest possible threshold */
+       lpm_nyet_threshold = 0xff;
+
+       /* default to -3.5dB de-emphasis */
+       tx_de_emphasis = 1;
+
+       /*
+        * default to assert utmi_sleep_n and use maximum allowed HIRD
+        * threshold value of 0b1100
+        */
+       hird_threshold = 12;
+
+       dwc->has_lpm_erratum = dev_read_bool(dev,
+                               "snps,has-lpm-erratum");
+       tmp = dev_read_u8_array_ptr(dev, "snps,lpm-nyet-threshold", 1);
+       if (tmp)
+               lpm_nyet_threshold = *tmp;
+
+       dwc->is_utmi_l1_suspend = dev_read_bool(dev,
+                               "snps,is-utmi-l1-suspend");
+       tmp = dev_read_u8_array_ptr(dev, "snps,hird-threshold", 1);
+       if (tmp)
+               hird_threshold = *tmp;
+
+       dwc->disable_scramble_quirk = dev_read_bool(dev,
+                               "snps,disable_scramble_quirk");
+       dwc->u2exit_lfps_quirk = dev_read_bool(dev,
+                               "snps,u2exit_lfps_quirk");
+       dwc->u2ss_inp3_quirk = dev_read_bool(dev,
+                               "snps,u2ss_inp3_quirk");
+       dwc->req_p1p2p3_quirk = dev_read_bool(dev,
+                               "snps,req_p1p2p3_quirk");
+       dwc->del_p1p2p3_quirk = dev_read_bool(dev,
+                               "snps,del_p1p2p3_quirk");
+       dwc->del_phy_power_chg_quirk = dev_read_bool(dev,
+                               "snps,del_phy_power_chg_quirk");
+       dwc->lfps_filter_quirk = dev_read_bool(dev,
+                               "snps,lfps_filter_quirk");
+       dwc->rx_detect_poll_quirk = dev_read_bool(dev,
+                               "snps,rx_detect_poll_quirk");
+       dwc->dis_u3_susphy_quirk = dev_read_bool(dev,
+                               "snps,dis_u3_susphy_quirk");
+       dwc->dis_u2_susphy_quirk = dev_read_bool(dev,
+                               "snps,dis_u2_susphy_quirk");
+       dwc->tx_de_emphasis_quirk = dev_read_bool(dev,
+                               "snps,tx_de_emphasis_quirk");
+       tmp = dev_read_u8_array_ptr(dev, "snps,tx_de_emphasis", 1);
+       if (tmp)
+               tx_de_emphasis = *tmp;
+
+       dwc->lpm_nyet_threshold = lpm_nyet_threshold;
+       dwc->tx_de_emphasis = tx_de_emphasis;
+
+       dwc->hird_threshold = hird_threshold
+               | (dwc->is_utmi_l1_suspend << 4);
+}
+
 int dwc3_init(struct dwc3 *dwc)
 {
        int ret;

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 4c89dfcad98cd82b30c732152d413280cacb0bb6..be9672266a7c8fc5b98aad24e1b5a2b95df008c1 100644 (file)
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -991,6 +991,7 @@ struct dwc3_gadget_ep_cmd_params {
 
 /* prototypes */
 int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc);
+void dwc3_of_parse(struct dwc3 *dwc);
 int dwc3_init(struct dwc3 *dwc);
 void dwc3_remove(struct dwc3 *dwc);
 

diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
index a3b65088f17196650996320c01b4ae32be93bc3e..023e95395be79e161d29cdbfec39fa92ee673494 100644 (file)
--- a/drivers/usb/dwc3/dwc3-generic.c
+++ b/drivers/usb/dwc3/dwc3-generic.c
@@ -48,8 +48,12 @@ static int dwc3_generic_probe(struct udevice *dev,
        struct dwc3_generic_plat *plat = dev_get_platdata(dev);
        struct dwc3 *dwc3 = &priv->dwc3;
 
+       dwc3->dev = dev;
        dwc3->maximum_speed = plat->maximum_speed;
        dwc3->dr_mode = plat->dr_mode;
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+       dwc3_of_parse(dwc3);
+#endif
 
        rc = dwc3_setup_phy(dev, &priv->phys, &priv->num_phys);
        if (rc)
@@ -57,7 +61,7 @@ static int dwc3_generic_probe(struct udevice *dev,
 
        priv->base = map_physmem(plat->base, DWC3_OTG_REGS_END, MAP_NOCACHE);
        dwc3->regs = priv->base + DWC3_GLOBALS_REGS_START;
-       dwc3->dev = dev;
+
 
        rc =  dwc3_init(dwc3);
        if (rc) {