From: Paul Cercueil <paul@crapouillou.net>
To: Thierry Reding <thierry.reding@gmail.com>
Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
od@zcrc.me, linux-pwm@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Paul Cercueil" <paul@crapouillou.net>,
"Mathieu Malaterre" <malat@debian.org>,
"Artur Rojek" <contact@artur-rojek.eu>
Subject: [PATCH 5/7] pwm: jz4740: Allow selection of PWM channels 0 and 1
Date: Fri, 9 Aug 2019 14:30:29 +0200 [thread overview]
Message-ID: <20190809123031.24219-6-paul@crapouillou.net> (raw)
In-Reply-To: <20190809123031.24219-1-paul@crapouillou.net>
The TCU channels 0 and 1 were previously reserved for system tasks, and
thus unavailable for PWM.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---
drivers/pwm/pwm-jz4740.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
index f20dc2e19240..85e2110aae4f 100644
--- a/drivers/pwm/pwm-jz4740.c
+++ b/drivers/pwm/pwm-jz4740.c
@@ -28,6 +28,19 @@ static inline struct jz4740_pwm_chip *to_jz4740(struct pwm_chip *chip)
return container_of(chip, struct jz4740_pwm_chip, chip);
}
+static bool jz4740_pwm_can_use_chn(struct jz4740_pwm_chip *jz,
+ unsigned int channel)
+{
+ /* Enable all TCU channels for PWM use by default except channels 0/1 */
+ u32 pwm_channels_mask = GENMASK(NUM_PWM - 1, 2);
+
+ device_property_read_u32(jz->chip.dev->parent,
+ "ingenic,pwm-channels-mask",
+ &pwm_channels_mask);
+
+ return !!(pwm_channels_mask & BIT(channel));
+}
+
static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct jz4740_pwm_chip *jz = to_jz4740(chip);
@@ -35,11 +48,7 @@ static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
char clk_name[16];
int ret;
- /*
- * Timers 0 and 1 are used for system tasks, so they are unavailable
- * for use as PWMs.
- */
- if (pwm->hwpwm < 2)
+ if (!jz4740_pwm_can_use_chn(jz, pwm->hwpwm))
return -EBUSY;
snprintf(clk_name, sizeof(clk_name), "timer%u", pwm->hwpwm);
--
2.21.0.593.g511ec345e18
next prev parent reply other threads:[~2019-08-09 12:31 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-09 12:30 [PATCH 0/7] pwm: jz4740: Driver update Paul Cercueil
2019-08-09 12:30 ` [PATCH 1/7] pwm: jz4740: Obtain regmap from parent node Paul Cercueil
2019-08-09 16:51 ` Uwe Kleine-König
2019-08-09 17:04 ` Paul Cercueil
2019-08-12 6:18 ` Uwe Kleine-König
2019-08-09 12:30 ` [PATCH 2/7] pwm: jz4740: Use clocks from TCU driver Paul Cercueil
2019-08-09 16:55 ` Uwe Kleine-König
2019-08-09 12:30 ` [PATCH 3/7] pwm: jz4740: Drop dependency on MACH_INGENIC Paul Cercueil
2019-08-09 16:41 ` Uwe Kleine-König
2019-08-09 21:40 ` Paul Cercueil
2019-08-12 6:09 ` Uwe Kleine-König
2019-08-09 12:30 ` [PATCH 4/7] pwm: jz4740: Improve algorithm of clock calculation Paul Cercueil
2019-08-09 17:05 ` Uwe Kleine-König
2019-08-09 17:14 ` Paul Cercueil
2019-08-12 6:15 ` Uwe Kleine-König
2019-08-12 20:43 ` Paul Cercueil
2019-08-12 21:48 ` Uwe Kleine-König
2019-08-12 22:25 ` Paul Cercueil
[not found] ` <1565648183.2007.3@crapouillou.net>
2019-08-13 5:27 ` Uwe Kleine-König
2019-08-13 11:01 ` Paul Cercueil
2019-08-13 12:33 ` Uwe Kleine-König
2019-08-13 12:47 ` Paul Cercueil
2019-08-13 14:09 ` Uwe Kleine-König
2019-08-14 16:10 ` Paul Cercueil
2019-08-14 17:32 ` Uwe Kleine-König
2019-10-21 12:47 ` Paul Cercueil
2020-02-12 7:29 ` About rounding in the clk framework [Was: Re: [PATCH 4/7] pwm: jz4740: Improve algorithm of clock calculation] Uwe Kleine-König
2020-04-14 9:24 ` Uwe Kleine-König
2020-12-21 13:57 ` Uwe Kleine-König
2019-08-09 12:30 ` Paul Cercueil [this message]
2019-08-09 12:30 ` [PATCH 6/7] pwm: jz4740: Make PWM start with the active part Paul Cercueil
2019-08-09 17:10 ` Uwe Kleine-König
2019-08-09 17:33 ` Paul Cercueil
2019-08-12 5:55 ` Uwe Kleine-König
2019-08-12 20:50 ` Paul Cercueil
2019-08-12 21:58 ` Uwe Kleine-König
2019-09-20 22:52 ` Thierry Reding
2019-08-09 12:30 ` [PATCH 7/7] pwm: jz4740: document known limitations Paul Cercueil
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