[src/trunk]: src/sys/dev/fdt Attach when dr_mode is "otg" and the controller ...

[skrll <skrll%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/653d927650fc
branches:  trunk
changeset: 366752:653d927650fc
user:      skrll <skrll%NetBSD.org@localhost>
date:      Sun Jun 12 08:04:07 2022 +0000

description:
Attach when dr_mode is "otg" and the controller has the "usb-role-switch" and
"role-switch-default-mode" as seen in the Apple M1 dts.

This assumes the controller is properly setup for host mode already.

diffstat:

 sys/dev/fdt/dwc3_fdt.c |  29 +++++++++++++++++++++++++----
 1 files changed, 25 insertions(+), 4 deletions(-)

diffs (51 lines):

diff -r a187a0a37b2e -r 653d927650fc sys/dev/fdt/dwc3_fdt.c
--- a/sys/dev/fdt/dwc3_fdt.c    Sun Jun 12 06:57:07 2022 +0000
+++ b/sys/dev/fdt/dwc3_fdt.c    Sun Jun 12 08:04:07 2022 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: dwc3_fdt.c,v 1.19 2021/11/07 17:14:20 jmcneill Exp $ */
+/* $NetBSD: dwc3_fdt.c,v 1.20 2022/06/12 08:04:07 skrll Exp $ */
 
 /*-
  * Copyright (c) 2018 Jared McNeill <jmcneill%invisible.ca@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: dwc3_fdt.c,v 1.19 2021/11/07 17:14:20 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: dwc3_fdt.c,v 1.20 2022/06/12 08:04:07 skrll Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -256,9 +256,30 @@
                return;
        }
 
-       /* Only host mode is supported */
+       /*
+        * Only host mode is supported, but this includes otg devices
+        * that have 'usb-role-switch' and 'role-switch-default-mode' of
+        * 'host'
+        */
        const char *dr_mode = fdtbus_get_string(dwc3_phandle, "dr_mode");
-       if (dr_mode == NULL || strcmp(dr_mode, "host") != 0) {
+       if (dr_mode == NULL || strcmp(dr_mode, "otg") == 0) {
+               bool ok = false;
+               if (of_hasprop(dwc3_phandle, "usb-role-switch")) {
+                       const char *rsdm = fdtbus_get_string(dwc3_phandle,
+                           "role-switch-default-mode");
+                       if (rsdm != NULL && strcmp(rsdm, "host") == 0)
+                               ok = true;
+
+                       if (!ok) {
+                               aprint_error(": host is not default mode\n");
+                               return;
+                       }
+               }
+               if (!ok) {
+                       aprint_error(": cannot switch 'otg' mode to host\n");
+                       return;
+               }
+       } else if (strcmp(dr_mode, "host") != 0) {
                aprint_error(": '%s' not supported\n", dr_mode);
                return;
        }