diff options
| -rw-r--r-- | doc/README.POST | 8 | ||||
| -rw-r--r-- | post/drivers/i2c.c | 26 |
2 files changed, 32 insertions, 2 deletions
diff --git a/doc/README.POST b/doc/README.POST index 695497e..6815d49 100644 --- a/doc/README.POST +++ b/doc/README.POST @@ -665,6 +665,14 @@ listed in CONFIG_SYS_POST_I2C_ADDRS are found, and no additional devices are detected. If CONFIG_SYS_POST_I2C_ADDRS is not defined the test will pass if any I2C device is found. +The CONFIG_SYS_POST_I2C_IGNORES define can be used to list I2C +devices which may or may not be present when using +CONFIG_SYS_POST_I2C_ADDRS. The I2C POST test will pass regardless +if the devices in CONFIG_SYS_POST_I2C_IGNORES are found or not. +This is useful in cases when I2C devices are optional (eg on a +daughtercard that may or may not be present) or not critical +to board operation. + 2.2.2.2. Watchdog timer test To test the watchdog timer the scheme mentioned above (refer to diff --git a/post/drivers/i2c.c b/post/drivers/i2c.c index e6f4c6a..3080e81 100644 --- a/post/drivers/i2c.c +++ b/post/drivers/i2c.c @@ -27,8 +27,12 @@ * For verifying the I2C bus, a full I2C bus scanning is performed. * * #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. + * 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 @@ -40,12 +44,28 @@ #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; #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; @@ -58,6 +78,8 @@ int i2c_post_test (int flags) /* 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; |