linux-kernel - [PATCH 7/7] pwm: jz4740: document known limitations

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Message-Id: <20190809123031.24219-8-paul@crapouillou.net>
Date:   Fri,  9 Aug 2019 14:30:31 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, od@...c.me,
        linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 7/7] pwm: jz4740: document known limitations

From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

The jz4740 PMW implementation doesn't fulfill the (up to now
insufficiently documented) requirements of the PWM API. At least
document them in the driver.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 drivers/pwm/pwm-jz4740.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
index 8df898429d47..b331a73a9d5d 100644
--- a/drivers/pwm/pwm-jz4740.c
+++ b/drivers/pwm/pwm-jz4740.c
@@ -2,6 +2,10 @@
 /*
  *  Copyright (C) 2010, Lars-Peter Clausen <lars@...afoo.de>
  *  JZ4740 platform PWM support
+ *
+ * Limitations:
+ * - The .apply callback doesn't complete the currently running period before
+ *   reconfiguring the hardware.
  */
 
 #include <linux/clk.h>
-- 
2.21.0.593.g511ec345e18