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Commit cfdad2ab authored by David Brown's avatar David Brown
Browse files

msm_serial: Add devicetree support 



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.

Change-Id: Ia6b2ddfcf1e5dc3bd25dd502662f971202e6d56f
Signed-off-by: default avatarDavid Brown <davidb@codeaurora.org>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 886a451b

Documentation/devicetree/bindings/tty/serial/msm_serial.txt

0 → 100644
+27 −0
Original line number Diff line number Diff line 
* Qualcomm MSM UART



Required properties:

- compatible :

	- "qcom,msm-uart", and one of "qcom,msm-hsuart" or

	  "qcom,msm-lsuart".

- 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 used in MSM devices,

"qcom,msm-hsuart" and "qcom,msm-lsuart".  The msm-serial driver is

able to handle both of these, and matches against the "qcom,msm-uart"

as the compatibility.



The registers for the "qcom,msm-hsuart" device need to specify both

register blocks, even for the common driver.



Example:



	uart@19c400000 {

		compatible = "qcom,msm-hsuart", "qcom,msm-uart";

		reg = <0x19c40000 0x1000>,

		      <0x19c00000 0x1000>;

		interrupts = <195>;

	};

drivers/tty/serial/msm_serial.c

+14 −0
Original line number Diff line number Diff line
@@ -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,

	},

};