serial: max310x: Add MAX14830 support
This patch adds support for MAX14830 (advanced quad universal asynchronous
receiver-transmitter) into max310x driver.
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index a6c4642..4ab5b27 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -1,5 +1,5 @@
/*
- * Maxim (Dallas) MAX3107/8/9 serial driver
+ * Maxim (Dallas) MAX3107/8/9, MAX14830 serial driver
*
* Copyright (C) 2012-2013 Alexander Shiyan <shc_work@mail.ru>
*
@@ -269,6 +269,10 @@
/* MAX3109 specific */
#define MAX3109_REV_ID (0xc0)
+/* MAX14830 specific */
+#define MAX14830_BRGCFG_CLKDIS_BIT (1 << 6) /* Clock Disable */
+#define MAX14830_REV_ID (0xb0)
+
struct max310x_devtype {
char name[9];
int nr;
@@ -387,6 +391,37 @@
msleep(50);
}
+static int max14830_detect(struct device *dev)
+{
+ struct max310x_port *s = dev_get_drvdata(dev);
+ unsigned int val = 0;
+ int ret;
+
+ ret = regmap_write(s->regmap, MAX310X_GLOBALCMD_REG,
+ MAX310X_EXTREG_ENBL);
+ if (ret)
+ return ret;
+
+ regmap_read(s->regmap, MAX310X_REVID_EXTREG, &val);
+ regmap_write(s->regmap, MAX310X_GLOBALCMD_REG, MAX310X_EXTREG_DSBL);
+ if (((val & MAX310x_REV_MASK) != MAX14830_REV_ID)) {
+ dev_err(dev,
+ "%s ID 0x%02x does not match\n", s->devtype->name, val);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void max14830_power(struct uart_port *port, int on)
+{
+ max310x_port_update(port, MAX310X_BRGCFG_REG,
+ MAX14830_BRGCFG_CLKDIS_BIT,
+ on ? 0 : MAX14830_BRGCFG_CLKDIS_BIT);
+ if (on)
+ msleep(50);
+}
+
static const struct max310x_devtype max3107_devtype = {
.name = "MAX3107",
.nr = 1,
@@ -408,6 +443,13 @@
.power = max310x_power,
};
+static const struct max310x_devtype max14830_devtype = {
+ .name = "MAX14830",
+ .nr = 4,
+ .detect = max14830_detect,
+ .power = max14830_power,
+};
+
static bool max310x_reg_writeable(struct device *dev, unsigned int reg)
{
switch (reg & 0x1f) {
@@ -1253,6 +1295,7 @@
{ "max3107", (kernel_ulong_t)&max3107_devtype, },
{ "max3108", (kernel_ulong_t)&max3108_devtype, },
{ "max3109", (kernel_ulong_t)&max3109_devtype, },
+ { "max14830", (kernel_ulong_t)&max14830_devtype, },
{ }
};
MODULE_DEVICE_TABLE(spi, max310x_id_table);