From patchwork Thu Nov 19 16:19:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 329517 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0ABA7C56201 for ; Thu, 19 Nov 2020 16:20:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B62B022261 for ; Thu, 19 Nov 2020 16:20:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727895AbgKSQUM (ORCPT ); Thu, 19 Nov 2020 11:20:12 -0500 Received: from relay5-d.mail.gandi.net ([217.70.183.197]:49673 "EHLO relay5-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727853AbgKSQUM (ORCPT ); Thu, 19 Nov 2020 11:20:12 -0500 X-Originating-IP: 93.34.118.233 Received: from localhost.localdomain (93-34-118-233.ip49.fastwebnet.it [93.34.118.233]) (Authenticated sender: jacopo@jmondi.org) by relay5-d.mail.gandi.net (Postfix) with ESMTPSA id C94121C001C; Thu, 19 Nov 2020 16:20:08 +0000 (UTC) From: Jacopo Mondi To: linux-media@vger.kernel.org Cc: Jacopo Mondi , mchehab@kernel.org, sakari.ailus@linux.intel.com, hverkuil@xs4all.nl, laurent.pinchart@ideasonboard.com, roman.kovalivskyi@globallogic.com, dafna.hirschfeld@collabora.com, dave.stevenson@raspberrypi.org, naush@raspberrypi.com, erosca@de.adit-jv.com Subject: [PATCH v4 02/30] media: ov5647: Add support for PWDN GPIO. Date: Thu, 19 Nov 2020 17:19:28 +0100 Message-Id: <20201119161956.756455-3-jacopo@jmondi.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201119161956.756455-1-jacopo@jmondi.org> References: <20201119161956.756455-1-jacopo@jmondi.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Dave Stevenson Add support for an optional GPIO connected to PWDN on the sensor. This allows the use of hardware standby mode where internal device clock and circuit activities are halted. Please note that power is off when PWDN is high. Signed-off-by: Dave Stevenson Signed-off-by: Roman Kovalivskyi Signed-off-by: Jacopo Mondi --- drivers/media/i2c/ov5647.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c index e7d2e5b4ad4b9..5dde138763eb0 100644 --- a/drivers/media/i2c/ov5647.c +++ b/drivers/media/i2c/ov5647.c @@ -21,6 +21,7 @@ #include #include +#include #include #include #include @@ -35,6 +36,13 @@ #define SENSOR_NAME "ov5647" +/* + * From the datasheet, "20ms after PWDN goes low or 20ms after RESETB goes + * high if reset is inserted after PWDN goes high, host can access sensor's + * SCCB to initialize sensor." + */ +#define PWDN_ACTIVE_DELAY_MS 20 + #define MIPI_CTRL00_CLOCK_LANE_GATE BIT(5) #define MIPI_CTRL00_BUS_IDLE BIT(2) #define MIPI_CTRL00_CLOCK_LANE_DISABLE BIT(0) @@ -86,6 +94,7 @@ struct ov5647 { unsigned int height; int power_count; struct clk *xclk; + struct gpio_desc *pwdn; }; static inline struct ov5647 *to_state(struct v4l2_subdev *sd) @@ -355,6 +364,11 @@ static int ov5647_sensor_power(struct v4l2_subdev *sd, int on) if (on && !ov5647->power_count) { dev_dbg(&client->dev, "OV5647 power on\n"); + if (ov5647->pwdn) { + gpiod_set_value_cansleep(ov5647->pwdn, 0); + msleep(PWDN_ACTIVE_DELAY_MS); + } + ret = clk_prepare_enable(ov5647->xclk); if (ret < 0) { dev_err(&client->dev, "clk prepare enable failed\n"); @@ -392,6 +406,8 @@ static int ov5647_sensor_power(struct v4l2_subdev *sd, int on) dev_dbg(&client->dev, "soft stby failed\n"); clk_disable_unprepare(ov5647->xclk); + + gpiod_set_value_cansleep(ov5647->pwdn, 1); } /* Update the power count. */ @@ -581,6 +597,14 @@ static int ov5647_probe(struct i2c_client *client) return -EINVAL; } + /* Request the power down GPIO asserted */ + sensor->pwdn = devm_gpiod_get_optional(&client->dev, "pwdn", + GPIOD_OUT_HIGH); + if (IS_ERR(sensor->pwdn)) { + dev_err(dev, "Failed to get 'pwdn' gpio\n"); + return -EINVAL; + } + mutex_init(&sensor->lock); sd = &sensor->sd; @@ -594,7 +618,15 @@ static int ov5647_probe(struct i2c_client *client) if (ret < 0) goto mutex_remove; + if (sensor->pwdn) { + gpiod_set_value_cansleep(sensor->pwdn, 0); + msleep(PWDN_ACTIVE_DELAY_MS); + } + ret = ov5647_detect(sd); + + gpiod_set_value_cansleep(sensor->pwdn, 1); + if (ret < 0) goto error;