From patchwork Thu Dec 16 16:34:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 12682067 X-Patchwork-Delegate: kieran@bingham.xyz Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CEB63C433FE for ; Thu, 16 Dec 2021 16:34:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239533AbhLPQeK (ORCPT ); Thu, 16 Dec 2021 11:34:10 -0500 Received: from relay11.mail.gandi.net ([217.70.178.231]:57893 "EHLO relay11.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230270AbhLPQeK (ORCPT ); Thu, 16 Dec 2021 11:34:10 -0500 Received: (Authenticated sender: jacopo@jmondi.org) by relay11.mail.gandi.net (Postfix) with ESMTPSA id 58286100016; Thu, 16 Dec 2021 16:34:06 +0000 (UTC) From: Jacopo Mondi To: Geert Uytterhoeven , Magnus Damm , Laurent Pinchart , Kieran Bingham , =?utf-8?q?Niklas_S=C3=B6d?= =?utf-8?q?erlund?= Cc: Jacopo Mondi , linux-renesas-soc@vger.kernel.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v8 3/7] media: i2c: max9286: Use "maxim,gpio-poc" property Date: Thu, 16 Dec 2021 17:34:35 +0100 Message-Id: <20211216163439.139579-4-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211216163439.139579-1-jacopo+renesas@jmondi.org> References: <20211216163439.139579-1-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org The 'maxim,gpio-poc' property is used when the remote camera power-over-coax is controlled by one of the MAX9286 gpio lines, to instruct the driver about which line to use and what the line polarity is. Add to the max9286 driver support for parsing the newly introduced property and use it if available in place of the usual supply, as it is not possible to establish one as consumer of the max9286 gpio controller. If the new property is present, no gpio controller is registered and 'poc-supply' is ignored. In order to maximize code re-use, break out the max9286 gpio handling function so that they can be used by the gpio controller through the gpio-consumer API, or directly by the driver code. Wrap the power up and power down routines to their own function to be able to use either the gpio line directly or the supply. This will make it easier to control the remote camera power at run time. Signed-off-by: Jacopo Mondi Reviewed-by: Laurent Pinchart --- drivers/media/i2c/max9286.c | 124 ++++++++++++++++++++++++++---------- 1 file changed, 92 insertions(+), 32 deletions(-) diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c index 7c663fd587bb..e9b7629fb5bc 100644 --- a/drivers/media/i2c/max9286.c +++ b/drivers/media/i2c/max9286.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -168,6 +169,8 @@ struct max9286_priv { u32 init_rev_chan_mv; u32 rev_chan_mv; + u32 gpio_poc[2]; + struct v4l2_ctrl_handler ctrls; struct v4l2_ctrl *pixelrate; @@ -1025,20 +1028,27 @@ static int max9286_setup(struct max9286_priv *priv) return 0; } -static void max9286_gpio_set(struct gpio_chip *chip, - unsigned int offset, int value) +static int max9286_gpio_set(struct max9286_priv *priv, unsigned int offset, + int value) { - struct max9286_priv *priv = gpiochip_get_data(chip); - if (value) priv->gpio_state |= BIT(offset); else priv->gpio_state &= ~BIT(offset); - max9286_write(priv, 0x0f, MAX9286_0X0F_RESERVED | priv->gpio_state); + return max9286_write(priv, 0x0f, + MAX9286_0X0F_RESERVED | priv->gpio_state); } -static int max9286_gpio_get(struct gpio_chip *chip, unsigned int offset) +static void max9286_gpiochip_set(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct max9286_priv *priv = gpiochip_get_data(chip); + + max9286_gpio_set(priv, offset, value); +} + +static int max9286_gpiochip_get(struct gpio_chip *chip, unsigned int offset) { struct max9286_priv *priv = gpiochip_get_data(chip); @@ -1058,13 +1068,10 @@ static int max9286_register_gpio(struct max9286_priv *priv) gpio->of_node = dev->of_node; gpio->ngpio = 2; gpio->base = -1; - gpio->set = max9286_gpio_set; - gpio->get = max9286_gpio_get; + gpio->set = max9286_gpiochip_set; + gpio->get = max9286_gpiochip_get; gpio->can_sleep = true; - /* GPIO values default to high */ - priv->gpio_state = BIT(0) | BIT(1); - ret = devm_gpiochip_add_data(dev, gpio, priv); if (ret) dev_err(dev, "Unable to create gpio_chip\n"); @@ -1072,6 +1079,72 @@ static int max9286_register_gpio(struct max9286_priv *priv) return ret; } +static int max9286_parse_gpios(struct max9286_priv *priv) +{ + struct device *dev = &priv->client->dev; + int ret; + + /* GPIO values default to high */ + priv->gpio_state = BIT(0) | BIT(1); + + /* + * Parse the "gpio-poc" vendor property. If the property is not + * specified the camera power is controlled by a regulator. + */ + ret = of_property_read_u32_array(dev->of_node, "maxim,gpio-poc", + priv->gpio_poc, 2); + if (ret == -EINVAL) { + /* + * If gpio lines are not used for the camera power, register + * a gpio controller for consumers. + */ + ret = max9286_register_gpio(priv); + if (ret) + return ret; + + priv->regulator = devm_regulator_get(dev, "poc"); + if (IS_ERR(priv->regulator)) { + if (PTR_ERR(priv->regulator) != -EPROBE_DEFER) + dev_err(dev, + "Unable to get PoC regulator (%ld)\n", + PTR_ERR(priv->regulator)); + return PTR_ERR(priv->regulator); + } + + return 0; + } + + /* If the property is specified make sure it is well formed. */ + if (ret || priv->gpio_poc[0] > 1 || + (priv->gpio_poc[1] != GPIO_ACTIVE_HIGH && + priv->gpio_poc[1] != GPIO_ACTIVE_LOW)) { + dev_err(dev, "Invalid 'gpio-poc' property\n"); + return -EINVAL; + } + + return 0; +} + +static int max9286_poc_enable(struct max9286_priv *priv, bool enable) +{ + int ret; + + /* If the regulator is not available, use gpio to control power. */ + if (!priv->regulator) + ret = max9286_gpio_set(priv, priv->gpio_poc[0], + enable ^ priv->gpio_poc[1]); + else if (enable) + ret = regulator_enable(priv->regulator); + else + ret = regulator_disable(priv->regulator); + + if (ret < 0) + dev_err(&priv->client->dev, "Unable to turn power %s\n", + enable ? "on" : "off"); + + return ret; +} + static int max9286_init(struct device *dev) { struct max9286_priv *priv; @@ -1081,17 +1154,14 @@ static int max9286_init(struct device *dev) client = to_i2c_client(dev); priv = i2c_get_clientdata(client); - /* Enable the bus power. */ - ret = regulator_enable(priv->regulator); - if (ret < 0) { - dev_err(&client->dev, "Unable to turn PoC on\n"); + ret = max9286_poc_enable(priv, true); + if (ret) return ret; - } ret = max9286_setup(priv); if (ret) { dev_err(dev, "Unable to setup max9286\n"); - goto err_regulator; + goto err_poc_disable; } /* @@ -1101,7 +1171,7 @@ static int max9286_init(struct device *dev) ret = max9286_v4l2_register(priv); if (ret) { dev_err(dev, "Failed to register with V4L2\n"); - goto err_regulator; + goto err_poc_disable; } ret = max9286_i2c_mux_init(priv); @@ -1117,8 +1187,8 @@ static int max9286_init(struct device *dev) err_v4l2_register: max9286_v4l2_unregister(priv); -err_regulator: - regulator_disable(priv->regulator); +err_poc_disable: + max9286_poc_enable(priv, false); return ret; } @@ -1289,20 +1359,10 @@ static int max9286_probe(struct i2c_client *client) */ max9286_configure_i2c(priv, false); - ret = max9286_register_gpio(priv); + ret = max9286_parse_gpios(priv); if (ret) goto err_powerdown; - priv->regulator = devm_regulator_get(&client->dev, "poc"); - if (IS_ERR(priv->regulator)) { - if (PTR_ERR(priv->regulator) != -EPROBE_DEFER) - dev_err(&client->dev, - "Unable to get PoC regulator (%ld)\n", - PTR_ERR(priv->regulator)); - ret = PTR_ERR(priv->regulator); - goto err_powerdown; - } - ret = max9286_parse_dt(priv); if (ret) goto err_powerdown; @@ -1329,7 +1389,7 @@ static int max9286_remove(struct i2c_client *client) max9286_v4l2_unregister(priv); - regulator_disable(priv->regulator); + max9286_poc_enable(priv, false); gpiod_set_value_cansleep(priv->gpiod_pwdn, 0);