[PATCH 1/2] soc: aspeed: Add LPC UART routing support
From: Chia-Wei Wang
Date: Wed Sep 01 2021 - 02:22:42 EST
Add driver support for the LPC UART routing control. Users can perform
runtime configuration of the RX muxes among the UART controllers and the
UART TXD/RXD IO pins. This is achieved through the exported sysfs interface.
Signed-off-by: Chia-Wei Wang <chiawei_wang@xxxxxxxxxxxxxx>
---
drivers/soc/aspeed/Kconfig | 11 +
drivers/soc/aspeed/Makefile | 9 +-
drivers/soc/aspeed/aspeed-lpc-uart-routing.c | 621 +++++++++++++++++++
3 files changed, 637 insertions(+), 4 deletions(-)
create mode 100644 drivers/soc/aspeed/aspeed-lpc-uart-routing.c
diff --git a/drivers/soc/aspeed/Kconfig b/drivers/soc/aspeed/Kconfig
index 243ca196e6ad..6866757e6be2 100644
--- a/drivers/soc/aspeed/Kconfig
+++ b/drivers/soc/aspeed/Kconfig
@@ -24,6 +24,17 @@ config ASPEED_LPC_SNOOP
allows the BMC to listen on and save the data written by
the host to an arbitrary LPC I/O port.
+config ASPEED_LPC_UART_ROUTING
+ tristate "ASPEED LPC uart routing control"
+ select REGMAP
+ select MFD_SYSCON
+ default ARCH_ASPEED
+ help
+ Provides a driver to control the LPC UART routing paths.
+ An sysfs interface is exported allowing users to perform
+ runtime configuration of the RX muxes between the UART
+ controllers and I/O pins.
+
config ASPEED_P2A_CTRL
tristate "ASPEED P2A (VGA MMIO to BMC) bridge control"
select REGMAP
diff --git a/drivers/soc/aspeed/Makefile b/drivers/soc/aspeed/Makefile
index fcab7192e1a4..87ad6578ddbb 100644
--- a/drivers/soc/aspeed/Makefile
+++ b/drivers/soc/aspeed/Makefile
@@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
-obj-$(CONFIG_ASPEED_LPC_CTRL) += aspeed-lpc-ctrl.o
-obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o
-obj-$(CONFIG_ASPEED_P2A_CTRL) += aspeed-p2a-ctrl.o
-obj-$(CONFIG_ASPEED_SOCINFO) += aspeed-socinfo.o
+obj-$(CONFIG_ASPEED_LPC_CTRL) += aspeed-lpc-ctrl.o
+obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o
+obj-$(CONFIG_ASPEED_LPC_UART_ROUTING) += aspeed-lpc-uart-routing.o
+obj-$(CONFIG_ASPEED_P2A_CTRL) += aspeed-p2a-ctrl.o
+obj-$(CONFIG_ASPEED_SOCINFO) += aspeed-socinfo.o
diff --git a/drivers/soc/aspeed/aspeed-lpc-uart-routing.c b/drivers/soc/aspeed/aspeed-lpc-uart-routing.c
new file mode 100644
index 000000000000..141d0d08b4ff
--- /dev/null
+++ b/drivers/soc/aspeed/aspeed-lpc-uart-routing.c
@@ -0,0 +1,621 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2018 Google LLC
+ * Copyright (c) 2021 Aspeed Technology Inc.
+ */
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+#include <linux/platform_device.h>
+
+/* register offsets */
+#define HICR9 0x98
+#define HICRA 0x9c
+
+/* attributes options */
+#define UART_ROUTING_IO1 "io1"
+#define UART_ROUTING_IO2 "io2"
+#define UART_ROUTING_IO3 "io3"
+#define UART_ROUTING_IO4 "io4"
+#define UART_ROUTING_IO5 "io5"
+#define UART_ROUTING_IO6 "io6"
+#define UART_ROUTING_IO10 "io10"
+#define UART_ROUTING_UART1 "uart1"
+#define UART_ROUTING_UART2 "uart2"
+#define UART_ROUTING_UART3 "uart3"
+#define UART_ROUTING_UART4 "uart4"
+#define UART_ROUTING_UART5 "uart5"
+#define UART_ROUTING_UART6 "uart6"
+#define UART_ROUTING_UART10 "uart10"
+#define UART_ROUTING_RES "reserved"
+
+struct aspeed_uart_routing {
+ struct regmap *map;
+ spinlock_t lock;
+ struct attribute_group const *attr_grp;
+};
+
+struct aspeed_uart_routing_selector {
+ struct device_attribute dev_attr;
+ uint32_t reg;
+ uint32_t mask;
+ uint32_t shift;
+ const char *const options[];
+};
+
+#define to_routing_selector(_dev_attr) \
+ container_of(_dev_attr, struct aspeed_uart_routing_selector, dev_attr)
+
+static ssize_t aspeed_uart_routing_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf);
+
+static ssize_t aspeed_uart_routing_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count);
+
+#define ROUTING_ATTR(_name) { \
+ .attr = {.name = _name, \
+ .mode = VERIFY_OCTAL_PERMISSIONS(0644) }, \
+ .show = aspeed_uart_routing_show, \
+ .store = aspeed_uart_routing_store, \
+}
+
+/* routing selector for AST25xx */
+static struct aspeed_uart_routing_selector ast2500_io6_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO6),
+ .reg = HICR9,
+ .shift = 8,
+ .mask = 0xf,
+ .options = {
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART5,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO5,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_uart5_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART5),
+ .reg = HICRA,
+ .shift = 28,
+ .mask = 0xf,
+ .options = {
+ UART_ROUTING_IO5,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_uart4_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART4),
+ .reg = HICRA,
+ .shift = 25,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_uart3_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART3),
+ .reg = HICRA,
+ .shift = 22,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_uart2_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART2),
+ .reg = HICRA,
+ .shift = 19,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART1,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_uart1_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART1),
+ .reg = HICRA,
+ .shift = 16,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_io5_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO5),
+ .reg = HICRA,
+ .shift = 12,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART5,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_io4_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO4),
+ .reg = HICRA,
+ .shift = 9,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART5,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_io3_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO3),
+ .reg = HICRA,
+ .shift = 6,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART5,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_io2_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO2),
+ .reg = HICRA,
+ .shift = 3,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART5,
+ UART_ROUTING_UART1,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_io1_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO1),
+ .reg = HICRA,
+ .shift = 0,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART5,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct attribute *ast2500_uart_routing_attrs[] = {
+ &ast2500_io6_sel.dev_attr.attr,
+ &ast2500_uart5_sel.dev_attr.attr,
+ &ast2500_uart4_sel.dev_attr.attr,
+ &ast2500_uart3_sel.dev_attr.attr,
+ &ast2500_uart2_sel.dev_attr.attr,
+ &ast2500_uart1_sel.dev_attr.attr,
+ &ast2500_io5_sel.dev_attr.attr,
+ &ast2500_io4_sel.dev_attr.attr,
+ &ast2500_io3_sel.dev_attr.attr,
+ &ast2500_io2_sel.dev_attr.attr,
+ &ast2500_io1_sel.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ast2500_uart_routing_attr_group = {
+ .attrs = ast2500_uart_routing_attrs,
+};
+
+/* routing selector for AST26xx */
+static struct aspeed_uart_routing_selector ast2600_uart10_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART10),
+ .reg = HICR9,
+ .shift = 12,
+ .mask = 0xf,
+ .options = {
+ UART_ROUTING_IO10,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_RES,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_io10_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO10),
+ .reg = HICR9,
+ .shift = 8,
+ .mask = 0xf,
+ .options = {
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_RES,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_RES,
+ UART_ROUTING_UART10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_uart4_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART4),
+ .reg = HICRA,
+ .shift = 25,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_uart3_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART3),
+ .reg = HICRA,
+ .shift = 22,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_uart2_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART2),
+ .reg = HICRA,
+ .shift = 19,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART1,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_uart1_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART1),
+ .reg = HICRA,
+ .shift = 16,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_io4_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO4),
+ .reg = HICRA,
+ .shift = 9,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART10,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_io3_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO3),
+ .reg = HICRA,
+ .shift = 6,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART10,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_io2_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO2),
+ .reg = HICRA,
+ .shift = 3,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART10,
+ UART_ROUTING_UART1,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_io1_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO1),
+ .reg = HICRA,
+ .shift = 0,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART10,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct attribute *ast2600_uart_routing_attrs[] = {
+ &ast2600_uart10_sel.dev_attr.attr,
+ &ast2600_io10_sel.dev_attr.attr,
+ &ast2600_uart4_sel.dev_attr.attr,
+ &ast2600_uart3_sel.dev_attr.attr,
+ &ast2600_uart2_sel.dev_attr.attr,
+ &ast2600_uart1_sel.dev_attr.attr,
+ &ast2600_io4_sel.dev_attr.attr,
+ &ast2600_io3_sel.dev_attr.attr,
+ &ast2600_io2_sel.dev_attr.attr,
+ &ast2600_io1_sel.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ast2600_uart_routing_attr_group = {
+ .attrs = ast2600_uart_routing_attrs,
+};
+
+static ssize_t aspeed_uart_routing_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct aspeed_uart_routing *uart_routing = dev_get_drvdata(dev);
+ struct aspeed_uart_routing_selector *sel = to_routing_selector(attr);
+ int val, pos, len;
+
+ regmap_read(uart_routing->map, sel->reg, &val);
+ val = (val >> sel->shift) & sel->mask;
+
+ len = 0;
+ for (pos = 0; sel->options[pos] != NULL; ++pos) {
+ if (pos == val) {
+ len += snprintf(buf + len, PAGE_SIZE - 1 - len,
+ "[%s] ", sel->options[pos]);
+ } else {
+ len += snprintf(buf + len, PAGE_SIZE - 1 - len,
+ "%s ", sel->options[pos]);
+ }
+ }
+
+ if (val >= pos) {
+ len += snprintf(buf + len, PAGE_SIZE - 1 - len,
+ "[unknown(%d)]", val);
+ }
+
+ len += snprintf(buf + len, PAGE_SIZE - 1 - len, "\n");
+
+ return len;
+}
+
+static ssize_t aspeed_uart_routing_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long flags;
+ struct aspeed_uart_routing *uart_routing = dev_get_drvdata(dev);
+ struct aspeed_uart_routing_selector *sel = to_routing_selector(attr);
+ int val;
+
+ val = match_string(sel->options, -1, buf);
+ if (val < 0) {
+ dev_err(dev, "invalid value \"%s\"\n", buf);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&uart_routing->lock, flags);
+
+ regmap_update_bits(uart_routing->map, sel->reg,
+ (sel->mask << sel->shift),
+ (val & sel->mask) << sel->shift);
+
+ spin_unlock_irqrestore(&uart_routing->lock, flags);
+
+ return count;
+}
+
+static int aspeed_uart_routing_probe(struct platform_device *pdev)
+{
+ int rc;
+ struct device *dev = &pdev->dev;
+ struct aspeed_uart_routing *uart_routing;
+
+ uart_routing = devm_kzalloc(&pdev->dev,
+ sizeof(*uart_routing),
+ GFP_KERNEL);
+ if (!uart_routing) {
+ dev_err(dev, "cannot allocate memory\n");
+ return -ENOMEM;
+ }
+
+ uart_routing->map = syscon_node_to_regmap(dev->parent->of_node);
+ if (IS_ERR(uart_routing->map)) {
+ dev_err(dev, "cannot get regmap\n");
+ return PTR_ERR(uart_routing->map);
+ }
+
+ uart_routing->attr_grp = of_device_get_match_data(dev);
+
+ spin_lock_init(&uart_routing->lock);
+
+ rc = sysfs_create_group(&dev->kobj,
+ uart_routing->attr_grp);
+ if (rc < 0)
+ return rc;
+
+ dev_set_drvdata(dev, uart_routing);
+
+ dev_info(dev, "module loaded\n");
+
+ return 0;
+}
+
+static int aspeed_uart_routing_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct aspeed_uart_routing *uart_routing = platform_get_drvdata(pdev);
+
+ sysfs_remove_group(&dev->kobj,
+ uart_routing->attr_grp);
+
+ return 0;
+}
+
+static const struct of_device_id aspeed_uart_routing_table[] = {
+ { .compatible = "aspeed,ast2500-lpc-uart-routing",
+ .data = &ast2500_uart_routing_attr_group },
+ { .compatible = "aspeed,ast2600-lpc-uart-routing",
+ .data = &ast2600_uart_routing_attr_group },
+ { },
+};
+
+static struct platform_driver aspeed_uart_routing_driver = {
+ .driver = {
+ .name = "aspeed-lpc-uart-routing",
+ .of_match_table = aspeed_uart_routing_table,
+ },
+ .probe = aspeed_uart_routing_probe,
+ .remove = aspeed_uart_routing_remove,
+};
+
+module_platform_driver(aspeed_uart_routing_driver);
+
+MODULE_AUTHOR("Oskar Senft <osk@xxxxxxxxxx>");
+MODULE_AUTHOR("Chia-Wei Wang <chiawei_wang@xxxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Driver to configure Aspeed UART routing");
--
2.17.1