linux-kernel - [PATCH v1 07/11] leds: aw200xx: add delay after software reset

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Message-ID: <20231006160437.15627-8-ddrokosov@salutedevices.com>
Date:   Fri, 6 Oct 2023 19:04:33 +0300
From:   Dmitry Rokosov <ddrokosov@...utedevices.com>
To:     <lee@...nel.org>, <pavel@....cz>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <andy.shevchenko@...il.com>
CC:     <kernel@...rdevices.ru>, <rockosov@...il.com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-leds@...r.kernel.org>,
        George Stark <gnstark@...utedevices.com>,
        Dmitry Rokosov <ddrokosov@...utedevices.com>
Subject: [PATCH v1 07/11] leds: aw200xx: add delay after software reset

From: George Stark <gnstark@...utedevices.com>

According to datasheets of aw200xx devices software reset takes at
least 1 ms so add delay after reset before issuing commands to device.

Signed-off-by: George Stark <gnstark@...utedevices.com>
Signed-off-by: Dmitry Rokosov <ddrokosov@...utedevices.com>
---
 drivers/leds/leds-aw200xx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/leds/leds-aw200xx.c b/drivers/leds/leds-aw200xx.c
index 5b6907eb6299..a1ef0b0a62fc 100644
--- a/drivers/leds/leds-aw200xx.c
+++ b/drivers/leds/leds-aw200xx.c
@@ -321,6 +321,9 @@ static int aw200xx_chip_reset(const struct aw200xx *const chip)
 	if (ret)
 		return ret;
 
+	/* according to datasheet software reset takes at least 1ms */
+	usleep_range(1000, 2000);
+
 	regcache_mark_dirty(chip->regmap);
 	return regmap_write(chip->regmap, AW200XX_REG_FCD, AW200XX_FCD_CLEAR);
 }
-- 
2.36.0