mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2024-12-28 16:52:18 +00:00
5412170f10
This prepares the pwm-clps711x driver to further changes of the pwm core outlined in the commit introducing devm_pwmchip_alloc(). There is no intended semantical change and the driver should behave as before. Link: https://lore.kernel.org/r/334e633bb8e4c26dc59883b068466387769b65f9.1707900770.git.u.kleine-koenig@pengutronix.de Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Cirrus Logic CLPS711X PWM driver
|
|
* Author: Alexander Shiyan <shc_work@mail.ru>
|
|
*/
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pwm.h>
|
|
|
|
struct clps711x_chip {
|
|
void __iomem *pmpcon;
|
|
struct clk *clk;
|
|
spinlock_t lock;
|
|
};
|
|
|
|
static inline struct clps711x_chip *to_clps711x_chip(struct pwm_chip *chip)
|
|
{
|
|
return pwmchip_get_drvdata(chip);
|
|
}
|
|
|
|
static int clps711x_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
|
|
{
|
|
struct clps711x_chip *priv = to_clps711x_chip(chip);
|
|
unsigned int freq = clk_get_rate(priv->clk);
|
|
|
|
if (!freq)
|
|
return -EINVAL;
|
|
|
|
/* Store constant period value */
|
|
pwm->args.period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, freq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int clps711x_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
|
|
const struct pwm_state *state)
|
|
{
|
|
struct clps711x_chip *priv = to_clps711x_chip(chip);
|
|
/* PWM0 - bits 4..7, PWM1 - bits 8..11 */
|
|
u32 shift = (pwm->hwpwm + 1) * 4;
|
|
unsigned long flags;
|
|
u32 pmpcon, val;
|
|
|
|
if (state->polarity != PWM_POLARITY_NORMAL)
|
|
return -EINVAL;
|
|
|
|
if (state->period != pwm->args.period)
|
|
return -EINVAL;
|
|
|
|
if (state->enabled)
|
|
val = mul_u64_u64_div_u64(state->duty_cycle, 0xf, state->period);
|
|
else
|
|
val = 0;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
|
|
pmpcon = readl(priv->pmpcon);
|
|
pmpcon &= ~(0xf << shift);
|
|
pmpcon |= val << shift;
|
|
writel(pmpcon, priv->pmpcon);
|
|
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct pwm_ops clps711x_pwm_ops = {
|
|
.request = clps711x_pwm_request,
|
|
.apply = clps711x_pwm_apply,
|
|
};
|
|
|
|
static int clps711x_pwm_probe(struct platform_device *pdev)
|
|
{
|
|
struct pwm_chip *chip;
|
|
struct clps711x_chip *priv;
|
|
|
|
chip = devm_pwmchip_alloc(&pdev->dev, 2, sizeof(*priv));
|
|
if (IS_ERR(chip))
|
|
return PTR_ERR(chip);
|
|
priv = to_clps711x_chip(chip);
|
|
|
|
priv->pmpcon = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(priv->pmpcon))
|
|
return PTR_ERR(priv->pmpcon);
|
|
|
|
priv->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(priv->clk))
|
|
return PTR_ERR(priv->clk);
|
|
|
|
chip->ops = &clps711x_pwm_ops;
|
|
|
|
spin_lock_init(&priv->lock);
|
|
|
|
return devm_pwmchip_add(&pdev->dev, chip);
|
|
}
|
|
|
|
static const struct of_device_id __maybe_unused clps711x_pwm_dt_ids[] = {
|
|
{ .compatible = "cirrus,ep7209-pwm", },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, clps711x_pwm_dt_ids);
|
|
|
|
static struct platform_driver clps711x_pwm_driver = {
|
|
.driver = {
|
|
.name = "clps711x-pwm",
|
|
.of_match_table = of_match_ptr(clps711x_pwm_dt_ids),
|
|
},
|
|
.probe = clps711x_pwm_probe,
|
|
};
|
|
module_platform_driver(clps711x_pwm_driver);
|
|
|
|
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
|
|
MODULE_DESCRIPTION("Cirrus Logic CLPS711X PWM driver");
|
|
MODULE_LICENSE("GPL");
|