core: add ofnode_get_by_phandle() api

[people/ms/u-boot.git] / post / drivers / i2c.c

diff --git a/post/drivers/i2c.c b/post/drivers/i2c.c
index b152deaf6abf52c91d164b49b0349b1b7795b004..95da2ebdaf528b191bb4c2d83235d4381779869e 100644 (file)
--- a/post/drivers/i2c.c
+++ b/post/drivers/i2c.c
@@ -2,89 +2,95 @@
  * (C) Copyright 2002
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier:    GPL-2.0+
  */
 
-#include <common.h>
-
 /*
  * I2C test
  *
  * For verifying the I2C bus, a full I2C bus scanning is performed.
  *
- * #ifdef I2C_ADDR_LIST
- *   The test is considered as passed if all the devices and
- *   only the devices in the list are found.
- * #else [ ! I2C_ADDR_LIST ]
+ * #ifdef CONFIG_SYS_POST_I2C_ADDRS
+ *   The test is considered as passed if all the devices and only the devices
+ *   in the list are found.
+ *   #ifdef CONFIG_SYS_POST_I2C_IGNORES
+ *     Ignore devices listed in CONFIG_SYS_POST_I2C_IGNORES.  These devices
+ *     are optional or not vital to board functionality.
+ *   #endif
+ * #else [ ! CONFIG_SYS_POST_I2C_ADDRS ]
  *   The test is considered as passed if any I2C device is found.
  * #endif
  */
 
+#include <common.h>
 #include <post.h>
 #include <i2c.h>
 
 #if CONFIG_POST & CONFIG_SYS_POST_I2C
 
+static int i2c_ignore_device(unsigned int chip)
+{
+#ifdef CONFIG_SYS_POST_I2C_IGNORES
+       const unsigned char i2c_ignore_list[] = CONFIG_SYS_POST_I2C_IGNORES;
+       int i;
+
+       for (i = 0; i < sizeof(i2c_ignore_list); i++)
+               if (i2c_ignore_list[i] == chip)
+                       return 1;
+#endif
+
+       return 0;
+}
+
 int i2c_post_test (int flags)
 {
        unsigned int i;
-       unsigned int good = 0;
-#ifdef I2C_ADDR_LIST
-       unsigned int bad  = 0;
+#ifndef CONFIG_SYS_POST_I2C_ADDRS
+       /* Start at address 1, address 0 is the general call address */
+       for (i = 1; i < 128; i++) {
+               if (i2c_ignore_device(i))
+                       continue;
+               if (i2c_probe (i) == 0)
+                       return 0;
+       }
+
+       /* No devices found */
+       return -1;
+#else
+       unsigned int ret  = 0;
        int j;
-       unsigned char i2c_addr_list[] = I2C_ADDR_LIST;
-       unsigned char i2c_miss_list[] = I2C_ADDR_LIST;
-#endif
+       unsigned char i2c_addr_list[] = CONFIG_SYS_POST_I2C_ADDRS;
 
-       for (i = 0; i < 128; i++) {
-               if (i2c_probe (i) == 0) {
-#ifndef        I2C_ADDR_LIST
-                       good++;
-#else  /* I2C_ADDR_LIST */
-                       for (j=0; j<sizeof(i2c_addr_list); ++j) {
-                               if (i == i2c_addr_list[j]) {
-                                       good++;
-                                       i2c_miss_list[j] = 0xFF;
-                                       break;
-                               }
-                       }
-                       if (j == sizeof(i2c_addr_list)) {
-                               bad++;
-                               post_log ("I2C: addr %02X not expected\n",
-                                               i);
+       /* Start at address 1, address 0 is the general call address */
+       for (i = 1; i < 128; i++) {
+               if (i2c_ignore_device(i))
+                       continue;
+               if (i2c_probe(i) != 0)
+                       continue;
+
+               for (j = 0; j < sizeof(i2c_addr_list); ++j) {
+                       if (i == i2c_addr_list[j]) {
+                               i2c_addr_list[j] = 0xff;
+                               break;
                        }
-#endif /* I2C_ADDR_LIST */
                }
-       }
 
-#ifndef        I2C_ADDR_LIST
-       return good > 0 ? 0 : -1;
-#else  /* I2C_ADDR_LIST */
-       if (good != sizeof(i2c_addr_list)) {
-               for (j=0; j<sizeof(i2c_miss_list); ++j) {
-                       if (i2c_miss_list[j] != 0xFF) {
-                               post_log ("I2C: addr %02X did not respond\n",
-                                               i2c_miss_list[j]);
-                       }
+               if (j == sizeof(i2c_addr_list)) {
+                       ret = -1;
+                       post_log("I2C: addr %02x not expected\n", i);
                }
        }
-       return ((good == sizeof(i2c_addr_list)) && (bad == 0)) ? 0 : -1;
+
+       for (i = 0; i < sizeof(i2c_addr_list); ++i) {
+               if (i2c_addr_list[i] == 0xff)
+                       continue;
+               if (i2c_ignore_device(i2c_addr_list[i]))
+                       continue;
+               post_log("I2C: addr %02x did not respond\n", i2c_addr_list[i]);
+               ret = -1;
+       }
+
+       return ret;
 #endif
 }