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mfd: arizona: Read the device identification information after boot 

Future devices may not fully report the device identification information
until their boot sequence is complete so defer acting on these until that
has finished.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2013-04-09 16:04:35 +01:00
parent f722406faa
commit ca76ceb8b9
1 changed files with 57 additions and 39 deletions
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96
drivers/mfd/arizona-core.c
View File

@ -536,6 +536,63 @@ int arizona_dev_init(struct arizona *arizona)
regcache_cache_only(arizona->regmap, false);
/* Verify that this is a chip we know about */
ret = regmap_read(arizona->regmap, ARIZONA_SOFTWARE_RESET, &reg);
if (ret != 0) {
dev_err(dev, "Failed to read ID register: %d\n", ret);
goto err_reset;
}
switch (reg) {
case 0x5102:
case 0x5110:
break;
default:
dev_err(arizona->dev, "Unknown device ID: %x\n", reg);
goto err_reset;
}
/* If we have a /RESET GPIO we'll already be reset */
if (!arizona->pdata.reset) {
regcache_mark_dirty(arizona->regmap);
ret = regmap_write(arizona->regmap, ARIZONA_SOFTWARE_RESET, 0);
if (ret != 0) {
dev_err(dev, "Failed to reset device: %d\n", ret);
goto err_reset;
}
msleep(1);
ret = regcache_sync(arizona->regmap);
if (ret != 0) {
dev_err(dev, "Failed to sync device: %d\n", ret);
goto err_reset;
}
}
/* Ensure device startup is complete */
switch (arizona->type) {
case WM5102:
ret = regmap_read(arizona->regmap, 0x19, &val);
if (ret != 0)
dev_err(dev,
"Failed to check write sequencer state: %d\n",
ret);
else if (val & 0x01)
break;
/* Fall through */
default:
ret = arizona_wait_for_boot(arizona);
if (ret != 0) {
dev_err(arizona->dev,
"Device failed initial boot: %d\n", ret);
goto err_reset;
}
break;
}
/* Read the device ID information & do device specific stuff */
ret = regmap_read(arizona->regmap, ARIZONA_SOFTWARE_RESET, &reg);
if (ret != 0) {
dev_err(dev, "Failed to read ID register: %d\n", ret);
@ -581,45 +638,6 @@ int arizona_dev_init(struct arizona *arizona)
dev_info(dev, "%s revision %c\n", type_name, arizona->rev + 'A');
/* If we have a /RESET GPIO we'll already be reset */
if (!arizona->pdata.reset) {
regcache_mark_dirty(arizona->regmap);
ret = regmap_write(arizona->regmap, ARIZONA_SOFTWARE_RESET, 0);
if (ret != 0) {
dev_err(dev, "Failed to reset device: %d\n", ret);
goto err_reset;
}
msleep(1);
ret = regcache_sync(arizona->regmap);
if (ret != 0) {
dev_err(dev, "Failed to sync device: %d\n", ret);
goto err_reset;
}
}
switch (arizona->type) {
case WM5102:
ret = regmap_read(arizona->regmap, 0x19, &val);
if (ret != 0)
dev_err(dev,
"Failed to check write sequencer state: %d\n",
ret);
else if (val & 0x01)
break;
/* Fall through */
default:
ret = arizona_wait_for_boot(arizona);
if (ret != 0) {
dev_err(arizona->dev,
"Device failed initial boot: %d\n", ret);
goto err_reset;
}
break;
}
if (apply_patch) {
ret = apply_patch(arizona);
if (ret != 0) {