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mach-snapdragon: of_fixup: support new flat dwc3 node

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Qualcomm DTs are being updated to use a new format where the dwc3 glue
node and controller are combined into a single DT node. Update the fixup
code to handle this case.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260114135739.1546815-1-casey.connolly@linaro.org
Signed-off-by: Casey Connolly <casey.connolly@linaro.org>
This commit is contained in:
Casey Connolly
2026-01-14 14:57:32 +01:00
parent 338c4b8208
commit 9be4f2f5f4
1 changed files with 29 additions and 11 deletions
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40
arch/arm/mach-snapdragon/of_fixup.c
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@@ -32,7 +32,7 @@
* DT here. This improves compatibility with upstream DT and simplifies the
* porting process for new devices.
*/
static int fixup_qcom_dwc3(struct device_node *root, struct device_node *glue_np)
static int fixup_qcom_dwc3(struct device_node *root, struct device_node *glue_np, bool flat)
{
struct device_node *dwc3;
int ret, len, hsphy_idx = 1;
@@ -41,6 +41,19 @@ static int fixup_qcom_dwc3(struct device_node *root, struct device_node *glue_np
debug("Fixing up %s\n", glue_np->name);
/* New DT flattens the glue and controller into a single node. */
if (flat) {
dwc3 = glue_np;
debug("%s uses flat DT\n", glue_np->name);
} else {
/* Find the DWC3 node itself */
dwc3 = of_find_compatible_node(glue_np, NULL, "snps,dwc3");
if (!dwc3) {
log_err("Failed to find dwc3 node\n");
return -ENOENT;
}
}
/* Tell the glue driver to configure the wrapper for high-speed only operation */
ret = of_write_prop(glue_np, "qcom,select-utmi-as-pipe-clk", 0, NULL);
if (ret) {
@@ -48,13 +61,6 @@ static int fixup_qcom_dwc3(struct device_node *root, struct device_node *glue_np
return ret;
}
/* Find the DWC3 node itself */
dwc3 = of_find_compatible_node(glue_np, NULL, "snps,dwc3");
if (!dwc3) {
log_err("Failed to find dwc3 node\n");
return -ENOENT;
}
phandles = of_get_property(dwc3, "phys", &len);
len /= sizeof(*phandles);
if (len == 1) {
@@ -104,13 +110,25 @@ static int fixup_qcom_dwc3(struct device_node *root, struct device_node *glue_np
static void fixup_usb_nodes(struct device_node *root)
{
struct device_node *glue_np = root;
struct device_node *glue_np = root, *tmp;
int ret;
bool flat;
while (true) {
flat = false;
/* First check for the old DT format with glue node then the new flattened format */
tmp = of_find_compatible_node(glue_np, NULL, "qcom,dwc3");
if (!tmp) {
tmp = of_find_compatible_node(glue_np, NULL, "qcom,snps-dwc3");
flat = !!tmp;
}
if (!tmp)
break;
glue_np = tmp;
while ((glue_np = of_find_compatible_node(glue_np, NULL, "qcom,dwc3"))) {
if (!of_device_is_available(glue_np))
continue;
ret = fixup_qcom_dwc3(root, glue_np);
ret = fixup_qcom_dwc3(root, glue_np, flat);
if (ret)
log_warning("Failed to fixup node %s: %d\n", glue_np->name, ret);
}