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authorHeiko Schocher <hs@denx.de>2011-08-01 04:01:43 +0000
committerWolfgang Denk <wd@denx.de>2011-08-04 23:30:38 +0200
commit780f13a9e1a21098c6255aaa1c46ed80aa7a436c (patch)
tree4273c1af78aa2f3079e11997e12814d66d47439e /drivers/hwmon/lm75.c
parentfb6440ee9b110b759ef61fd80bbd0df1bbf0f37b (diff)
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hwmon: do not init sensors on startup
The U-Boot Design Principles[1] clearly say: Initialize devices only when they are needed within U-Boot, i.e. don't initialize the Ethernet interface(s) unless U-Boot performs a download over Ethernet; don't initialize any IDE or USB devices unless U-Boot actually tries to load files from these, etc. (and don't forget to shut down these devices after using them - otherwise nasty things may happen when you try to boot your OS). So, do not initialize and read the sensors on startup. Signed-off-by: Heiko Schocher <hs@denx.de> cc: Wolfgang Denk <wd@denx.de> cc: Holger Brunck <holger.brunck@keymile.com>
Diffstat (limited to 'drivers/hwmon/lm75.c')
-rw-r--r--drivers/hwmon/lm75.c29
1 files changed, 2 insertions, 27 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 8119821..29c1a39 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -119,7 +119,7 @@ int dtt_write(int sensor, int reg, int val)
} /* dtt_write() */
-static int _dtt_init(int sensor)
+int dtt_init_one(int sensor)
{
int val;
@@ -145,32 +145,7 @@ static int _dtt_init(int sensor)
return 1;
return 0;
-} /* _dtt_init() */
-
-
-int dtt_init (void)
-{
- int i;
- unsigned char sensors[] = CONFIG_DTT_SENSORS;
- const char *const header = "DTT: ";
- int old_bus;
-
- /* switch to correct I2C bus */
- old_bus = I2C_GET_BUS();
- I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM);
-
- for (i = 0; i < sizeof(sensors); i++) {
- if (_dtt_init(sensors[i]) != 0)
- printf("%s%d FAILED INIT\n", header, i+1);
- else
- printf("%s%d is %i C\n", header, i+1,
- dtt_get_temp(sensors[i]));
- }
- /* switch back to original I2C bus */
- I2C_SET_BUS(old_bus);
-
- return (0);
-} /* dtt_init() */
+} /* dtt_init_one() */
int dtt_get_temp(int sensor)
{