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hwmon: do not init sensors on startup

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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>
This commit is contained in:
Heiko Schocher
2011-08-01 04:01:43 +00:00
committed by Wolfgang Denk
parent fb6440ee9b
commit 780f13a9e1
11 changed files with 28 additions and 149 deletions
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19
drivers/hwmon/lm63.c
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@@ -101,7 +101,7 @@ static int is_lm64(int sensor)
return sensor && (sensor != DTT_I2C_LM63_ADDR);
}
static int _dtt_init(int sensor)
int dtt_init_one(int sensor)
{
int i;
int val;
@@ -175,20 +175,3 @@ int dtt_get_temp(int sensor)
/* Ignore LSB for now, U-Boot only prints natural numbers */
return temp >> 8;
}
int dtt_init(void)
{
int i;
unsigned char sensors[] = CONFIG_DTT_SENSORS;
const char *const header = "DTT: ";
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]));
}
return 0;
}