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author | David Brown <davidb@codeaurora.org> | 2011-08-04 01:55:24 -0700 |
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committer | David Brown <davidb@codeaurora.org> | 2011-08-29 12:47:36 -0700 |
commit | cfdad2aba7398021f6eec415b9271b9cb40065f9 (patch) | |
tree | a38cd210577bdba2affd72322fa36b41404adcd1 | |
parent | 886a451bd2491de3551c2aea2a2f155f159716c8 (diff) | |
download | op-kernel-dev-cfdad2aba7398021f6eec415b9271b9cb40065f9.zip op-kernel-dev-cfdad2aba7398021f6eec415b9271b9cb40065f9.tar.gz |
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: David Brown <davidb@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
-rw-r--r-- | Documentation/devicetree/bindings/tty/serial/msm_serial.txt | 27 | ||||
-rw-r--r-- | drivers/tty/serial/msm_serial.c | 14 |
2 files changed, 41 insertions, 0 deletions
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..aef383e --- /dev/null +++ b/Documentation/devicetree/bindings/tty/serial/msm_serial.txt @@ -0,0 +1,27 @@ +* 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>; + }; 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, }, }; |