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mfd: Add companion chip in 88pm80x 

in hw design, 800 is mainly for pmic control, while 805 for audio.
but there are 3 registers which controls class D speaker property,
and they are defined in 800 i2c client domain. so 805 codec driver
needs to use 800 i2c client to access class D speaker reg for
audio path management. so add this workaround for the purpose to
let 805 access 800 i2c in some scenario.

Signed-off-by: Qiao Zhou <zhouqiao@marvell.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Qiao Zhou 2012-07-09 14:37:33 +08:00 committed by Samuel Ortiz
parent 70c6cce040
commit 5500e3964b
2 changed files with 29 additions and 0 deletions
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28
drivers/mfd/88pm80x.c
View File

@ -18,6 +18,12 @@
#include <linux/uaccess.h>
#include <linux/err.h>
/*
* workaround: some registers needed by pm805 are defined in pm800, so
* need to use this global variable to maintain the relation between
* pm800 and pm805. would remove it after HW chip fixes the issue.
*/
static struct pm80x_chip *g_pm80x_chip;
const struct regmap_config pm80x_regmap_config = {
.reg_bits = 8,
@ -61,6 +67,19 @@ int __devinit pm80x_init(struct i2c_client *client,
device_init_wakeup(&client->dev, 1);
/*
* workaround: set g_pm80x_chip to the first probed chip. if the
* second chip is probed, just point to the companion to each
* other so that pm805 can access those specific register. would
* remove it after HW chip fixes the issue.
*/
if (!g_pm80x_chip)
g_pm80x_chip = chip;
else {
chip->companion = g_pm80x_chip->client;
g_pm80x_chip->companion = chip->client;
}
return 0;
err_chip_id:
@ -75,6 +94,15 @@ int __devexit pm80x_deinit(struct i2c_client *client)
{
struct pm80x_chip *chip = i2c_get_clientdata(client);
/*
* workaround: clear the dependency between pm800 and pm805.
* would remove it after HW chip fixes the issue.
*/
if (g_pm80x_chip->companion)
g_pm80x_chip->companion = NULL;
else
g_pm80x_chip = NULL;
regmap_exit(chip->regmap);
devm_kfree(&client->dev, chip);

1
include/linux/mfd/88pm80x.h
View File

@ -295,6 +295,7 @@ struct pm80x_chip {
struct pm80x_subchip *subchip;
struct device *dev;
struct i2c_client *client;
struct i2c_client *companion;
struct regmap *regmap;
struct regmap_irq_chip *regmap_irq_chip;
struct regmap_irq_chip_data *irq_data;