mfd: pm8xxx-misc: Add uart gpio mux control API
CRs-Fixed: 313982
Change-Id: I10ea5283271619f0ae510ad7039e0df8b1745f57
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
diff --git a/drivers/mfd/pm8xxx-misc.c b/drivers/mfd/pm8xxx-misc.c
index 00ac2ab..7367e66 100644
--- a/drivers/mfd/pm8xxx-misc.c
+++ b/drivers/mfd/pm8xxx-misc.c
@@ -53,6 +53,12 @@
#define PM8901_REGULATOR_PMR_STATE_MASK 0x60
#define PM8901_REGULATOR_PMR_STATE_OFF 0x20
+/* GPIO UART MUX CTRL registers */
+#define REG_PM8XXX_GPIO_MUX_CTRL 0x1CC
+
+#define UART_PATH_SEL_MASK 0x60
+#define UART_PATH_SEL_SHIFT 0x5
+
struct pm8xxx_misc_chip {
struct list_head link;
struct pm8xxx_misc_platform_data pdata;
@@ -260,6 +266,47 @@
}
EXPORT_SYMBOL_GPL(pm8xxx_reset_pwr_off);
+/**
+ * pm8xxx_uart_gpio_mux_ctrl - Mux configuration to select the UART
+ *
+ * @uart_path_sel: Input argument to select either UART1/2/3
+ *
+ * RETURNS: an appropriate -ERRNO error value on error, or zero for success.
+ */
+int pm8xxx_uart_gpio_mux_ctrl(enum pm8xxx_uart_path_sel uart_path_sel)
+{
+ 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_misc_masked_write(chip,
+ REG_PM8XXX_GPIO_MUX_CTRL, UART_PATH_SEL_MASK,
+ uart_path_sel << UART_PATH_SEL_SHIFT);
+ break;
+ default:
+ /* Functionality not supported */
+ break;
+ }
+ if (rc) {
+ pr_err("uart_gpio_mux_ctrl failed, rc=%d\n", rc);
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(&pm8xxx_misc_chips_lock, flags);
+
+ return rc;
+}
+EXPORT_SYMBOL(pm8xxx_uart_gpio_mux_ctrl);
+
static int __devinit pm8xxx_misc_probe(struct platform_device *pdev)
{
const struct pm8xxx_misc_platform_data *pdata = pdev->dev.platform_data;