[pinmux] Make REGEN RW0C
diff --git a/hw/ip/pinmux/doc/pinmux.hjson b/hw/ip/pinmux/doc/pinmux.hjson
index 59a4816..166445f 100644
--- a/hw/ip/pinmux/doc/pinmux.hjson
+++ b/hw/ip/pinmux/doc/pinmux.hjson
@@ -32,7 +32,7 @@
       desc: '''
             Register write enable for all control registers.
             ''',
-      swaccess: "rw1c",
+      swaccess: "rw0c",
       hwaccess: "none",
       fields: [
         {