iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

pwm: fsl-ftm: Added the support of per-compatible data

Browse Source 
On the i.MX8x SoC family, an additional PWM enable bit is added for each
PWM channel in the register FTM_SC[23:16]. It supports 8 channels. Bit
16 is for channel 0, and bit 23 is for channel 7. As the IP version
information can not be obtained via any of the FTM registers, a property
of "has_enable_bits" is added via per-compatible data structure.

Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
shenwei.wang@nxp.com 2018-06-08 14:22:35 -05:00 committed by Thierry Reding
parent 82a9c55a2b
commit db6c51ab15
1 changed files with 30 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/pwm/pwm-fsl-ftm.c
View File

@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/pwm.h>
@ -75,6 +76,10 @@ enum fsl_pwm_clk {
FSL_PWM_CLK_MAX
};
struct fsl_ftm_soc {
bool has_enable_bits;
};
struct fsl_pwm_chip {
struct pwm_chip chip;
@ -89,6 +94,8 @@ struct fsl_pwm_chip {
struct clk *ipg_clk;
struct clk *clk[FSL_PWM_CLK_MAX];
const struct fsl_ftm_soc *soc;
};
static inline struct fsl_pwm_chip *to_fsl_chip(struct pwm_chip *chip)
@ -98,15 +105,31 @@ static inline struct fsl_pwm_chip *to_fsl_chip(struct pwm_chip *chip)
static int fsl_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
int ret;
struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
return clk_prepare_enable(fpc->ipg_clk);
ret = clk_prepare_enable(fpc->ipg_clk);
if (!ret && fpc->soc->has_enable_bits) {
mutex_lock(&fpc->lock);
regmap_update_bits(fpc->regmap, FTM_SC, BIT(pwm->hwpwm + 16),
BIT(pwm->hwpwm + 16));
mutex_unlock(&fpc->lock);
}
return ret;
}
static void fsl_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
if (fpc->soc->has_enable_bits) {
mutex_lock(&fpc->lock);
regmap_update_bits(fpc->regmap, FTM_SC, BIT(pwm->hwpwm + 16),
0);
mutex_unlock(&fpc->lock);
}
clk_disable_unprepare(fpc->ipg_clk);
}
@ -409,6 +432,7 @@ static int fsl_pwm_probe(struct platform_device *pdev)
mutex_init(&fpc->lock);
fpc->soc = of_device_get_match_data(&pdev->dev);
fpc->chip.dev = &pdev->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@ -534,8 +558,12 @@ static const struct dev_pm_ops fsl_pwm_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(fsl_pwm_suspend, fsl_pwm_resume)
};
static const struct fsl_ftm_soc vf610_ftm_pwm = {
.has_enable_bits = false,
};
static const struct of_device_id fsl_pwm_dt_ids[] = {
{ .compatible = "fsl,vf610-ftm-pwm", },
{ .compatible = "fsl,vf610-ftm-pwm", .data = &vf610_ftm_pwm },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, fsl_pwm_dt_ids);