[src/trunk]: src/sys/dev/ofw ofw: add of_enter_spi_devs helper method

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

details:   https://anonhg.NetBSD.org/src/rev/3ed9f7015716
branches:  trunk
changeset: 458676:3ed9f7015716
user:      tnn <tnn%NetBSD.org@localhost>
date:      Tue Aug 06 18:17:52 2019 +0000

description:
ofw: add of_enter_spi_devs helper method

For translating OFW child nodes of SPI controller into "spi-child-devices"
property. In similar spirit to the existing of_enter_i2c_devs method.

diffstat:

 sys/dev/ofw/ofw_subr.c |  62 ++++++++++++++++++++++++++++++++++++++++++++++++-
 sys/dev/ofw/openfirm.h |   3 +-
 2 files changed, 62 insertions(+), 3 deletions(-)

diffs (100 lines):

diff -r 104e95325322 -r 3ed9f7015716 sys/dev/ofw/ofw_subr.c
--- a/sys/dev/ofw/ofw_subr.c    Tue Aug 06 18:07:51 2019 +0000
+++ b/sys/dev/ofw/ofw_subr.c    Tue Aug 06 18:17:52 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ofw_subr.c,v 1.33 2018/09/26 20:03:36 jakllsch Exp $   */
+/*     $NetBSD: ofw_subr.c,v 1.34 2019/08/06 18:17:52 tnn Exp $        */
 
 /*
  * Copyright 1998
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ofw_subr.c,v 1.33 2018/09/26 20:03:36 jakllsch Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ofw_subr.c,v 1.34 2019/08/06 18:17:52 tnn Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -503,6 +503,64 @@
        }
 }
 
+void
+of_enter_spi_devs(prop_dictionary_t props, int ofnode, size_t cell_size)
+{
+       int node, len;
+       char name[32];
+       uint64_t reg64;
+       uint32_t reg32;
+       uint32_t slave;
+       u_int32_t maxfreq;
+       prop_array_t array = NULL;
+       prop_dictionary_t dev;
+       int mode;
+
+       for (node = OF_child(ofnode); node; node = OF_peer(node)) {
+               if (OF_getprop(node, "name", name, sizeof(name)) <= 0)
+                       continue;
+               len = OF_getproplen(node, "reg");
+               slave = 0;
+               if (cell_size == 8 && len >= sizeof(reg64)) {
+                       if (OF_getprop(node, "reg", &reg64, sizeof(reg64))
+                           < sizeof(reg64))
+                               continue;
+                       slave = be64toh(reg64);
+               } else if (cell_size == 4 && len >= sizeof(reg32)) {
+                       if (OF_getprop(node, "reg", &reg32, sizeof(reg32))
+                           < sizeof(reg32))
+                               continue;
+                       slave = be32toh(reg32);
+               } else {
+                       continue;
+               }
+               if (of_getprop_uint32(node, "spi-max-frequency", &maxfreq)) {
+                       maxfreq = 0;
+               }
+               mode = ((int)of_hasprop(node, "cpol") << 1) | (int)of_hasprop(node, "cpha");
+
+               if (array == NULL)
+                       array = prop_array_create();
+
+               dev = prop_dictionary_create();
+               prop_dictionary_set_cstring(dev, "name", name);
+               prop_dictionary_set_uint32(dev, "slave", slave);
+               prop_dictionary_set_uint32(dev, "mode", mode);
+               if (maxfreq > 0)
+                       prop_dictionary_set_uint32(dev, "spi-max-frequency", maxfreq);
+               prop_dictionary_set_uint64(dev, "cookie", node);
+               of_to_dataprop(dev, node, "compatible", "compatible");
+               prop_array_add(array, dev);
+               prop_object_release(dev);
+       }
+
+       if (array != NULL) {
+               prop_dictionary_set(props, "spi-child-devices", array);
+               prop_object_release(array);
+       }
+}
+
+
 /*
  * Returns true if the specified property is present.
  */
diff -r 104e95325322 -r 3ed9f7015716 sys/dev/ofw/openfirm.h
--- a/sys/dev/ofw/openfirm.h    Tue Aug 06 18:07:51 2019 +0000
+++ b/sys/dev/ofw/openfirm.h    Tue Aug 06 18:17:52 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: openfirm.h,v 1.37 2018/08/23 13:24:44 jmcneill Exp $   */
+/*     $NetBSD: openfirm.h,v 1.38 2019/08/06 18:17:52 tnn Exp $        */
 
 /*
  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
@@ -126,6 +126,7 @@
 char   *of_get_mode_string(char *, int);
 
 void   of_enter_i2c_devs(prop_dictionary_t, int, size_t, int);
+void   of_enter_spi_devs(prop_dictionary_t, int, size_t);
 
 bool   of_hasprop(int, const char *);
 #define of_getprop_bool        of_hasprop