linux-kernel - [PATCH v10 15/27] pwm: jz4740: Allow selection of PWM channels 0 and 1

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Date:   Sat,  2 Mar 2019 20:34:01 -0300
From:   Paul Cercueil <paul@...pouillou.net>
To:     Thierry Reding <thierry.reding@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Mathieu Malaterre <malat@...ian.org>, od@...c.me,
        linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-clk@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH v10 15/27] pwm: jz4740: Allow selection of PWM channels 0 and 1

The TCU channels 0 and 1 were previously reserved for system tasks, and
thus unavailable for PWM.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
Tested-by: Mathieu Malaterre <malat@...ian.org>
Tested-by: Artur Rojek <contact@...ur-rojek.eu>
---

Notes:
         v6: New patch
    
         v7: No change
    
         v8: ingenic_tcu_[request,release]_channel are dropped. We now use
             the memory resources provided to the driver to detect whether
    	 or not we are allowed to use the TCU channel.
    
         v9: Drop previous system. Call a API function provided by the
             clocksource driver to know if we can use the channel as PWM.
    
         v10: No change

 drivers/pwm/pwm-jz4740.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
index f497388fc818..c914589d547b 100644
--- a/drivers/pwm/pwm-jz4740.c
+++ b/drivers/pwm/pwm-jz4740.c
@@ -44,11 +44,7 @@ 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 (!ingenic_tcu_pwm_can_use_chn(pwm->hwpwm))
 		return -EBUSY;
 
 	snprintf(clk_name, sizeof(clk_name), "timer%u", pwm->hwpwm);
-- 
2.11.0