mfd: Add support for the RDC321x southbridge

This patch adds a new MFD driver for the RDC321x southbridge. This southbridge
is always present in the RDC321x System-on-a-Chip and provides access to some
GPIOs as well as a watchdog. Access to these two functions is done using the
southbridge PCI device configuration space.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/include/linux/mfd/rdc321x.h b/include/linux/mfd/rdc321x.h
new file mode 100644
index 000000000000..4bdf19c8eedf
--- /dev/null
+++ b/include/linux/mfd/rdc321x.h
@@ -0,0 +1,26 @@
+#ifndef __RDC321X_MFD_H
+#define __RDC321X_MFD_H
+
+#include <linux/types.h>
+#include <linux/pci.h>
+
+/* Offsets to be accessed in the southbridge PCI
+ * device configuration register */
+#define RDC321X_WDT_CTRL        0x44
+#define RDC321X_GPIO_CTRL_REG1  0x48
+#define RDC321X_GPIO_DATA_REG1  0x4c
+#define RDC321X_GPIO_CTRL_REG2  0x84
+#define RDC321X_GPIO_DATA_REG2  0x88
+
+#define RDC321X_MAX_GPIO        58
+
+struct rdc321x_gpio_pdata {
+        struct pci_dev *sb_pdev;
+        unsigned max_gpios;
+};
+
+struct rdc321x_wdt_pdata {
+        struct pci_dev *sb_pdev;
+};
+
+#endif /* __RDC321X_MFD_H */