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pwm: tegra: Add device tree support 

Add auxdata to instantiate the PWFM controller from a device tree,
include the corresponding nodes in the dtsi files for Tegra 20 and
Tegra 30 and add binding documentation.

Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
hifive-unleashed-5.1
Thierry Reding 2011-12-21 08:04:13 +01:00
parent 0134b932a0
commit 140fd977dc
6 changed files with 45 additions and 0 deletions
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18
Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt 100644
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@ -0,0 +1,18 @@
Tegra SoC PWFM controller
Required properties:
- compatible: should be one of:
- "nvidia,tegra20-pwm"
- "nvidia,tegra30-pwm"
- reg: physical base address and length of the controller's registers
- #pwm-cells: On Tegra the number of cells used to specify a PWM is 2. The
first cell specifies the per-chip index of the PWM to use and the second
cell is the duty cycle in nanoseconds.
Example:
pwm: pwm@7000a000 {
compatible = "nvidia,tegra20-pwm";
reg = <0x7000a000 0x100>;
#pwm-cells = <2>;
};

6
arch/arm/boot/dts/tegra20.dtsi
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@ -123,6 +123,12 @@
status = "disable";
};
pwm {
compatible = "nvidia,tegra20-pwm";
reg = <0x7000a000 0x100>;
#pwm-cells = <2>;
};
i2c@7000c000 {
compatible = "nvidia,tegra20-i2c";
reg = <0x7000c000 0x100>;

6
arch/arm/boot/dts/tegra30.dtsi
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@ -117,6 +117,12 @@
status = "disable";
};
pwm {
compatible = "nvidia,tegra30-pwm", "nvidia,tegra20-pwm";
reg = <0x7000a000 0x100>;
#pwm-cells = <2>;
};
i2c@7000c000 {
compatible = "nvidia,tegra30-i2c", "nvidia,tegra20-i2c";
reg = <0x7000c000 0x100>;

1
arch/arm/mach-tegra/board-dt-tegra20.c
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@ -64,6 +64,7 @@ struct of_dev_auxdata tegra20_auxdata_lookup[] __initdata = {
&tegra_ehci2_pdata),
OF_DEV_AUXDATA("nvidia,tegra20-ehci", TEGRA_USB3_BASE, "tegra-ehci.2",
&tegra_ehci3_pdata),
OF_DEV_AUXDATA("nvidia,tegra20-pwm", TEGRA_PWFM_BASE, "tegra-pwm", NULL),
{}
};

3
arch/arm/mach-tegra/board-dt-tegra30.c
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@ -33,6 +33,8 @@
#include <asm/mach/arch.h>
#include <asm/hardware/gic.h>
#include <mach/iomap.h>
#include "board.h"
#include "clock.h"
@ -52,6 +54,7 @@ struct of_dev_auxdata tegra30_auxdata_lookup[] __initdata = {
OF_DEV_AUXDATA("nvidia,tegra20-i2c", 0x7000C700, "tegra-i2c.3", NULL),
OF_DEV_AUXDATA("nvidia,tegra20-i2c", 0x7000D000, "tegra-i2c.4", NULL),
OF_DEV_AUXDATA("nvidia,tegra30-ahub", 0x70080000, "tegra30-ahub", NULL),
OF_DEV_AUXDATA("nvidia,tegra30-pwm", TEGRA_PWFM_BASE, "tegra-pwm", NULL),
{}
};

11
drivers/pwm/pwm-tegra.c
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@ -239,9 +239,20 @@ static int __devexit tegra_pwm_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_OF
static struct of_device_id tegra_pwm_of_match[] = {
{ .compatible = "nvidia,tegra20-pwm" },
{ .compatible = "nvidia,tegra30-pwm" },
{ }
};
MODULE_DEVICE_TABLE(of, tegra_pwm_of_match);
#endif
static struct platform_driver tegra_pwm_driver = {
.driver = {
.name = "tegra-pwm",
.of_match_table = of_match_ptr(tegra_pwm_of_match),
},
.probe = tegra_pwm_probe,
.remove = __devexit_p(tegra_pwm_remove),