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>
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@ -18,6 +18,12 @@
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#include <linux/uaccess.h>
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#include <linux/uaccess.h>
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#include <linux/err.h>
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#include <linux/err.h>
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/*
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* workaround: some registers needed by pm805 are defined in pm800, so
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* need to use this global variable to maintain the relation between
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* pm800 and pm805. would remove it after HW chip fixes the issue.
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*/
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static struct pm80x_chip *g_pm80x_chip;
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const struct regmap_config pm80x_regmap_config = {
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const struct regmap_config pm80x_regmap_config = {
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.reg_bits = 8,
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.reg_bits = 8,
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@ -61,6 +67,19 @@ int __devinit pm80x_init(struct i2c_client *client,
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device_init_wakeup(&client->dev, 1);
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device_init_wakeup(&client->dev, 1);
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/*
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* workaround: set g_pm80x_chip to the first probed chip. if the
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* second chip is probed, just point to the companion to each
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* other so that pm805 can access those specific register. would
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* remove it after HW chip fixes the issue.
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*/
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if (!g_pm80x_chip)
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g_pm80x_chip = chip;
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else {
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chip->companion = g_pm80x_chip->client;
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g_pm80x_chip->companion = chip->client;
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}
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return 0;
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return 0;
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err_chip_id:
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err_chip_id:
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@ -75,6 +94,15 @@ int __devexit pm80x_deinit(struct i2c_client *client)
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{
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{
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struct pm80x_chip *chip = i2c_get_clientdata(client);
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struct pm80x_chip *chip = i2c_get_clientdata(client);
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/*
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* workaround: clear the dependency between pm800 and pm805.
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* would remove it after HW chip fixes the issue.
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*/
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if (g_pm80x_chip->companion)
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g_pm80x_chip->companion = NULL;
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else
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g_pm80x_chip = NULL;
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regmap_exit(chip->regmap);
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regmap_exit(chip->regmap);
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devm_kfree(&client->dev, chip);
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devm_kfree(&client->dev, chip);
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@ -295,6 +295,7 @@ struct pm80x_chip {
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struct pm80x_subchip *subchip;
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struct pm80x_subchip *subchip;
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struct device *dev;
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struct device *dev;
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struct i2c_client *client;
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struct i2c_client *client;
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struct i2c_client *companion;
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struct regmap *regmap;
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struct regmap *regmap;
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struct regmap_irq_chip *regmap_irq_chip;
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struct regmap_irq_chip *regmap_irq_chip;
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struct regmap_irq_chip_data *irq_data;
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struct regmap_irq_chip_data *irq_data;
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