Add devicetree support to the msm_serial driver. Clocks are still
queried by direct name from the driver until device tree clock support
is implemented.
Signed-off-by: David Brown <davidb@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/tty/serial/msm_serial.txt | 22 ++++++++++++++++++++
drivers/tty/serial/msm_serial.c | 14 ++++++++++++
2 files changed, 36 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/tty/serial/msm_serial.txt
diff --git a/Documentation/devicetree/bindings/tty/serial/msm_serial.txt b/Documentation/devicetree/bindings/tty/serial/msm_serial.txt
new file mode 100644
index 0000000..1b72e79
--- /dev/null
+++ b/Documentation/devicetree/bindings/tty/serial/msm_serial.txt
@@ -0,0 +1,22 @@
+* Qualcomm MSM UART
+
+Required properties:
+- compatible :
+ - "qcom,msm-uart"
+- reg : offset and length of the register set for the device
+ for the hsuart operating in compatible mode, there should be a
+ second pair describing the gsbi registers.
+- interrupts : should contain the uart interrupt.
+
+There are two different UART blocks in MSM devices, "qcom,msm-uart"
+and "qcom,msm-hsuart". The msm-serial driver is able to handle both
+of these devices.
+
+Example:
+
+ uart@19c400000 {
+ compatible = "qcom,msm-hsuart", "qcom,msm-uart";
+ reg = <0x19c40000 0x1000>,
+ <0x19c00000 0x1000>;
+ interrupts = <195>;
+ };
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index d9863b2..7767902 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -19,6 +19,7 @@
# define SUPPORT_SYSRQ
#endif
+#include <linux/atomic.h>
#include <linux/hrtimer.h>
#include <linux/module.h>
#include <linux/io.h>
@@ -33,6 +34,8 @@
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include "msm_serial.h"
@@ -856,6 +859,8 @@ static struct uart_driver msm_uart_driver = {
.cons = MSM_CONSOLE,
};
+static atomic_t msm_uart_next_id = ATOMIC_INIT(0);
+
static int __init msm_serial_probe(struct platform_device *pdev)
{
struct msm_port *msm_port;
@@ -863,6 +868,9 @@ static int __init msm_serial_probe(struct platform_device *pdev)
struct uart_port *port;
int irq;
+ if (pdev->id == -1)
+ pdev->id = atomic_inc_return(&msm_uart_next_id) - 1;
+
if (unlikely(pdev->id < 0 || pdev->id >= UART_NR))
return -ENXIO;
@@ -920,11 +928,17 @@ static int __devexit msm_serial_remove(struct platform_device *pdev)
return 0;
}
+static struct of_device_id msm_match_table[] = {
+ { .compatible = "qcom,msm-uart" },
+ {}
+};
+
static struct platform_driver msm_platform_driver = {
.remove = msm_serial_remove,
.driver = {
.name = "msm_serial",
.owner = THIS_MODULE,
+ .of_match_table = msm_match_table,
},
};
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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