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dm: sandbox: pwm: Add a basic pwm test

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Unfortunately a test for the PWM uclass was not included when it was
submitted. This was noticed when trying to add more functionality:

   http://patchwork.ozlabs.org/patch/748172/

Add a simple test to get us started.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2017-04-16 21:01:11 -06:00
committed by Tom Rini
parent 29f089a605
commit 43b41566f7
9 changed files with 131 additions and 0 deletions
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8
drivers/pwm/Kconfig
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@@ -27,6 +27,14 @@ config PWM_ROCKCHIP
Various options provided in the hardware (such as capture mode and
continuous/single-shot) are not supported by the driver.
config PWM_SANDBOX
bool "Enable support for the sandbox PWM"
help
This is a sandbox PWM used for testing. It provides 3 channels and
records the settings passed into it, but otherwise does nothing
useful. The PWM can be enabled but is not connected to any outputs
so this is not very useful.
config PWM_TEGRA
bool "Enable support for the Tegra PWM"
depends on DM_PWM

1
drivers/pwm/Makefile
View File

@@ -15,4 +15,5 @@ obj-$(CONFIG_DM_PWM) += pwm-uclass.o
obj-$(CONFIG_PWM_EXYNOS) += exynos_pwm.o
obj-$(CONFIG_PWM_IMX) += pwm-imx.o pwm-imx-util.o
obj-$(CONFIG_PWM_ROCKCHIP) += rk_pwm.o
obj-$(CONFIG_PWM_SANDBOX) += sandbox_pwm.o
obj-$(CONFIG_PWM_TEGRA) += tegra_pwm.o

75
drivers/pwm/sandbox_pwm.c Normal file
View File

@@ -0,0 +1,75 @@
/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <pwm.h>
#include <asm/test.h>
DECLARE_GLOBAL_DATA_PTR;
enum {
NUM_CHANNELS = 3,
};
struct sandbox_pwm_chan {
uint period_ns;
uint duty_ns;
bool enable;
};
struct sandbox_pwm_priv {
struct sandbox_pwm_chan chan[NUM_CHANNELS];
};
static int sandbox_pwm_set_config(struct udevice *dev, uint channel,
uint period_ns, uint duty_ns)
{
struct sandbox_pwm_priv *priv = dev_get_priv(dev);
struct sandbox_pwm_chan *chan;
if (channel >= NUM_CHANNELS)
return -ENOSPC;
chan = &priv->chan[channel];
chan->period_ns = period_ns;
chan->duty_ns = duty_ns;
return 0;
}
static int sandbox_pwm_set_enable(struct udevice *dev, uint channel,
bool enable)
{
struct sandbox_pwm_priv *priv = dev_get_priv(dev);
struct sandbox_pwm_chan *chan;
if (channel >= NUM_CHANNELS)
return -ENOSPC;
chan = &priv->chan[channel];
chan->enable = enable;
return 0;
}
static const struct pwm_ops sandbox_pwm_ops = {
.set_config = sandbox_pwm_set_config,
.set_enable = sandbox_pwm_set_enable,
};
static const struct udevice_id sandbox_pwm_ids[] = {
{ .compatible = "sandbox,pwm" },
{ }
};
U_BOOT_DRIVER(warm_pwm_sandbox) = {
.name = "pwm_sandbox",
.id = UCLASS_PWM,
.of_match = sandbox_pwm_ids,
.ops = &sandbox_pwm_ops,
.priv_auto_alloc_size = sizeof(struct sandbox_pwm_priv),
};