diff options
| author | Lukasz Majewski <lukma@denx.de> | 2017-01-29 22:54:15 +0100 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2017-01-30 09:13:07 +0100 |
| commit | 326ed314fefebb259563926c8c6110a009562e07 (patch) | |
| tree | 6632352a509854ee4dc52f8edadaaa8ad4dcf1d4 /drivers | |
| parent | c322f457755aea8eea91c79c473e17ffa7f12cfc (diff) | |
| download | linux-stable-326ed314fefebb259563926c8c6110a009562e07.tar.gz linux-stable-326ed314fefebb259563926c8c6110a009562e07.tar.bz2 linux-stable-326ed314fefebb259563926c8c6110a009562e07.zip | |
pwm: imx: Add polarity inversion support to i.MX's PWMv2
With this patch the polarity settings for i.MX's PWMv2 is now supported
on top of atomic PWM setting
Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Signed-off-by: Lukasz Majewski <l.majewski@majess.pl>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pwm/pwm-imx.c | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c index 0a81c028cb11..957099e82ed3 100644 --- a/drivers/pwm/pwm-imx.c +++ b/drivers/pwm/pwm-imx.c @@ -38,6 +38,7 @@ #define MX3_PWMCR_DOZEEN (1 << 24) #define MX3_PWMCR_WAITEN (1 << 23) #define MX3_PWMCR_DBGEN (1 << 22) +#define MX3_PWMCR_POUTC (1 << 18) #define MX3_PWMCR_CLKSRC_IPG_HIGH (2 << 16) #define MX3_PWMCR_CLKSRC_IPG (1 << 16) #define MX3_PWMCR_SWR (1 << 3) @@ -163,6 +164,7 @@ static int imx_pwm_apply_v2(struct pwm_chip *chip, struct pwm_device *pwm, struct pwm_state cstate; unsigned long long c; int ret; + u32 cr; pwm_get_state(pwm, &cstate); @@ -207,11 +209,15 @@ static int imx_pwm_apply_v2(struct pwm_chip *chip, struct pwm_device *pwm, writel(duty_cycles, imx->mmio_base + MX3_PWMSAR); writel(period_cycles, imx->mmio_base + MX3_PWMPR); - writel(MX3_PWMCR_PRESCALER(prescale) | - MX3_PWMCR_DOZEEN | MX3_PWMCR_WAITEN | - MX3_PWMCR_DBGEN | MX3_PWMCR_CLKSRC_IPG_HIGH | - MX3_PWMCR_EN, - imx->mmio_base + MX3_PWMCR); + cr = MX3_PWMCR_PRESCALER(prescale) | + MX3_PWMCR_DOZEEN | MX3_PWMCR_WAITEN | + MX3_PWMCR_DBGEN | MX3_PWMCR_CLKSRC_IPG_HIGH | + MX3_PWMCR_EN; + + if (state->polarity == PWM_POLARITY_INVERSED) + cr |= MX3_PWMCR_POUTC; + + writel(cr, imx->mmio_base + MX3_PWMCR); } else if (cstate.enabled) { writel(0, imx->mmio_base + MX3_PWMCR); @@ -234,6 +240,7 @@ static const struct pwm_ops imx_pwm_ops_v2 = { }; struct imx_pwm_data { + bool polarity_supported; const struct pwm_ops *ops; }; @@ -242,6 +249,7 @@ static struct imx_pwm_data imx_pwm_data_v1 = { }; static struct imx_pwm_data imx_pwm_data_v2 = { + .polarity_supported = true, .ops = &imx_pwm_ops_v2, }; @@ -283,6 +291,12 @@ static int imx_pwm_probe(struct platform_device *pdev) imx->chip.npwm = 1; imx->chip.can_sleep = true; + if (data->polarity_supported) { + dev_dbg(&pdev->dev, "PWM supports output inversion\n"); + imx->chip.of_xlate = of_pwm_xlate_with_flags; + imx->chip.of_pwm_n_cells = 3; + } + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); imx->mmio_base = devm_ioremap_resource(&pdev->dev, r); if (IS_ERR(imx->mmio_base)) |