mfd: pm8xxx-misc: Add pm8xxx stay on API
The API configures the PMIC to ignore the PS_HOLD low
signal, which can be used during debugging.
Change-Id: I162657934e34da081eb897d64ffed36ad48e4eff
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
diff --git a/drivers/mfd/pm8xxx-misc.c b/drivers/mfd/pm8xxx-misc.c
index 0f94a83..a73a695 100644
--- a/drivers/mfd/pm8xxx-misc.c
+++ b/drivers/mfd/pm8xxx-misc.c
@@ -119,6 +119,12 @@
#define COINCELL_RESISTOR_SHIFT 0x2
+/* GP TEST register */
+#define REG_PM8XXX_GP_TEST_1 0x07A
+
+/* Stay on configuration */
+#define PM8XXX_STAY_ON_CFG 0x92
+
/* GPIO UART MUX CTRL registers */
#define REG_PM8XXX_GPIO_MUX_CTRL 0x1CC
@@ -738,6 +744,50 @@
}
EXPORT_SYMBOL(pm8xxx_watchdog_reset_control);
+/**
+ * pm8xxx_stay_on - enables stay_on feature
+ *
+ * PMIC stay-on feature allows PMIC to ignore MSM PS_HOLD=low
+ * signal so that some special functions like debugging could be
+ * performed.
+ *
+ * This feature should not be used in any product release.
+ *
+ * RETURNS: an appropriate -ERRNO error value on error, or zero for success.
+ */
+int pm8xxx_stay_on(void)
+{
+ struct pm8xxx_misc_chip *chip;
+ unsigned long flags;
+ int rc = 0;
+
+ spin_lock_irqsave(&pm8xxx_misc_chips_lock, flags);
+
+ /* Loop over all attached PMICs and call specific functions for them. */
+ list_for_each_entry(chip, &pm8xxx_misc_chips, link) {
+ switch (chip->version) {
+ case PM8XXX_VERSION_8018:
+ case PM8XXX_VERSION_8058:
+ case PM8XXX_VERSION_8921:
+ rc = pm8xxx_writeb(chip->dev->parent,
+ REG_PM8XXX_GP_TEST_1, PM8XXX_STAY_ON_CFG);
+ break;
+ default:
+ /* stay on not supported */
+ break;
+ }
+ if (rc) {
+ pr_err("stay_on failed failed, rc=%d\n", rc);
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(&pm8xxx_misc_chips_lock, flags);
+
+ return rc;
+}
+EXPORT_SYMBOL(pm8xxx_stay_on);
+
static int
__pm8xxx_hard_reset_config(struct pm8xxx_misc_chip *chip,
enum pm8xxx_pon_config config, u16 pon4_addr, u16 pon5_addr)