[src/trunk]: src/sys/dev/fdt Attach cpu nodes with status "disabled" if they ...

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

details:   https://anonhg.NetBSD.org/src/rev/4be83b262893
branches:  trunk
changeset: 993417:4be83b262893
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sun Sep 09 21:15:21 2018 +0000

description:
Attach cpu nodes with status "disabled" if they have an enable-method
property. This is a valid configuration according to the devicetree
specification.

diffstat:

 sys/dev/fdt/cpus.c |  31 ++++++++++++++++++++++++++++---
 1 files changed, 28 insertions(+), 3 deletions(-)

diffs (57 lines):

diff -r cefd3657911e -r 4be83b262893 sys/dev/fdt/cpus.c
--- a/sys/dev/fdt/cpus.c        Sun Sep 09 21:14:04 2018 +0000
+++ b/sys/dev/fdt/cpus.c        Sun Sep 09 21:15:21 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: cpus.c,v 1.3 2018/06/30 16:30:35 jmcneill Exp $ */
+/* $NetBSD: cpus.c,v 1.4 2018/09/09 21:15:21 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2017 Jared McNeill <jmcneill%invisible.ca@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cpus.c,v 1.3 2018/06/30 16:30:35 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cpus.c,v 1.4 2018/09/09 21:15:21 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -42,6 +42,8 @@
 static int     cpus_match(device_t, cfdata_t, void *);
 static void    cpus_attach(device_t, device_t, void *);
 
+static bool    cpus_bus_match(void *, int);
+
 CFATTACH_DECL_NEW(cpus, 0, cpus_match, cpus_attach, NULL, NULL);
 
 static int
@@ -61,5 +63,28 @@
        aprint_naive("\n");
        aprint_normal("\n");
 
-       fdt_add_bus(self, phandle, faa);
+       fdt_add_bus_match(self, phandle, faa, cpus_bus_match, NULL);
 }
+
+static bool
+cpus_bus_match(void *priv, int child)
+{
+       const char *s;
+
+       /* Only match nodes with device_type = "cpu" */
+       s = fdtbus_get_string(child, "device_type");
+       if (!s || strcmp(s, "cpu") != 0)
+               return false;
+
+       /* If status is set, it must be either "okay" or "disabled" */
+       s = fdtbus_get_string(child, "status");
+       if (s) {
+               if (strcmp(s, "okay") == 0)
+                       return false;
+               if (strcmp(s, "disabled") == 0)
+                       return of_hasprop(child, "enable-method");
+               return false;
+       } else {
+               return true;
+       }
+}