From patchwork Mon Dec 19 02:18:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 635354 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 9555BC10F1E for ; Mon, 19 Dec 2022 02:18:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230320AbiLSCS3 (ORCPT ); Sun, 18 Dec 2022 21:18:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52158 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229537AbiLSCS2 (ORCPT ); Sun, 18 Dec 2022 21:18:28 -0500 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DD51636B; Sun, 18 Dec 2022 18:18:27 -0800 (PST) Received: from pendragon.ideasonboard.com (213-243-189-158.bb.dnainternet.fi [213.243.189.158]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 6B63C825; Mon, 19 Dec 2022 03:18:24 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1671416304; bh=H6yrZhYu8f7yDckTkv9HZg/BSu0BBpkshhmHadC10Zo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GWzPgDoBGQaoUTBp9BTntTATahYRST4NDHqzV+nCZfoSE5CvZb+YrUtbrIarfob2N 1ojsOVULj56eVcVIn2pBXTzhGzqqRZ8tSd0kj1ogOVR4t3zjOZ7Jql7nJrQRSyoW7Q jgfEYg2hHRfIT3Z3ShB6VLWi9N9r/15pJCQKRAxw= From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Jacopo Mondi , Kieran Bingham , =?utf-8?q?Niklas_S=C3=B6d?= =?utf-8?q?erlund?= , Thomas Nizan , Liam Girdwood , Mark Brown Subject: [PATCH v3.1 04/12] media: i2c: max9286: Add support for port regulators Date: Mon, 19 Dec 2022 04:18:20 +0200 Message-Id: <20221219021820.24596-1-laurent.pinchart@ideasonboard.com> X-Mailer: git-send-email 2.38.2 In-Reply-To: <20221214233825.13050-5-laurent.pinchart+renesas@ideasonboard.com> References: <20221214233825.13050-5-laurent.pinchart+renesas@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Thomas Nizan Allow users to use one PoC regulator per port, instead of a global regulator. The properties '^port[0-3]-poc-supply$' in the DT node are used to indicate the regulators for individual ports. Signed-off-by: Thomas Nizan Signed-off-by: Laurent Pinchart --- Changes since v3: - Use dev_err_probe() everywhere Changes since v2: - Adapt to the poc-gpio support Changes since v1: - Use to_index() - Use dev_err_probe() - Fix error path in probe() - Use devm_regulator_get_optional() instead of devm_regulator_get_exclusive() --- drivers/media/i2c/max9286.c | 135 ++++++++++++++++++++++++++++++------ 1 file changed, 112 insertions(+), 23 deletions(-) diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c index 9c083cf14231..a65457b1e7e0 100644 --- a/drivers/media/i2c/max9286.c +++ b/drivers/media/i2c/max9286.c @@ -139,6 +139,7 @@ struct max9286_source { struct v4l2_subdev *sd; struct fwnode_handle *fwnode; + struct regulator *regulator; }; struct max9286_asd { @@ -169,6 +170,7 @@ struct max9286_priv { u32 init_rev_chan_mv; u32 rev_chan_mv; + bool use_gpio_poc; u32 gpio_poc[2]; struct v4l2_ctrl_handler ctrls; @@ -1088,9 +1090,6 @@ 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. @@ -1102,18 +1101,7 @@ static int max9286_parse_gpios(struct max9286_priv *priv) * 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)) { - return dev_err_probe(dev, PTR_ERR(priv->regulator), - "Unable to get PoC regulator (%ld)\n", - PTR_ERR(priv->regulator)); - } - - return 0; + return max9286_register_gpio(priv); } /* If the property is specified make sure it is well formed. */ @@ -1124,21 +1112,75 @@ static int max9286_parse_gpios(struct max9286_priv *priv) return -EINVAL; } + priv->use_gpio_poc = true; return 0; } +static int max9286_poc_power_on(struct max9286_priv *priv) +{ + struct max9286_source *source; + unsigned int enabled = 0; + int ret; + + /* Enable the global regulator if available. */ + if (priv->regulator) + return regulator_enable(priv->regulator); + + if (priv->use_gpio_poc) + return max9286_gpio_set(priv, priv->gpio_poc[0], + !priv->gpio_poc[1]); + + /* Otherwise use the per-port regulators. */ + for_each_source(priv, source) { + ret = regulator_enable(source->regulator); + if (ret < 0) + goto error; + + enabled |= BIT(to_index(priv, source)); + } + + return 0; + +error: + for_each_source(priv, source) { + if (enabled & BIT(to_index(priv, source))) + regulator_disable(source->regulator); + } + + return ret; +} + +static int max9286_poc_power_off(struct max9286_priv *priv) +{ + struct max9286_source *source; + int ret = 0; + + if (priv->regulator) + return regulator_disable(priv->regulator); + + if (priv->use_gpio_poc) + return max9286_gpio_set(priv, priv->gpio_poc[0], + priv->gpio_poc[1]); + + for_each_source(priv, source) { + int err; + + err = regulator_disable(source->regulator); + if (!ret) + ret = err; + } + + return ret; +} + 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); + if (enable) + ret = max9286_poc_power_on(priv); else - ret = regulator_disable(priv->regulator); + ret = max9286_poc_power_off(priv); if (ret < 0) dev_err(&priv->client->dev, "Unable to turn power %s\n", @@ -1317,6 +1359,44 @@ static int max9286_parse_dt(struct max9286_priv *priv) return 0; } +static int max9286_get_poc_supplies(struct max9286_priv *priv) +{ + struct device *dev = &priv->client->dev; + struct max9286_source *source; + int ret; + + /* Start by getting the global regulator. */ + priv->regulator = devm_regulator_get_optional(dev, "poc"); + if (!IS_ERR(priv->regulator)) + return 0; + + if (PTR_ERR(priv->regulator) != -ENODEV) + return dev_err_probe(dev, PTR_ERR(priv->regulator), + "Unable to get PoC regulator\n"); + + /* If there's no global regulator, get per-port regulators. */ + dev_dbg(dev, + "No global PoC regulator, looking for per-port regulators\n"); + priv->regulator = NULL; + + for_each_source(priv, source) { + unsigned int index = to_index(priv, source); + char name[10]; + + snprintf(name, sizeof(name), "port%u-poc", index); + source->regulator = devm_regulator_get(dev, name); + if (IS_ERR(source->regulator)) { + ret = PTR_ERR(source->regulator); + dev_err_probe(dev, ret, + "Unable to get port %u PoC regulator\n", + index); + return ret; + } + } + + return 0; +} + static int max9286_probe(struct i2c_client *client) { struct max9286_priv *priv; @@ -1330,6 +1410,9 @@ static int max9286_probe(struct i2c_client *client) priv->client = client; + /* GPIO values default to high */ + priv->gpio_state = BIT(0) | BIT(1); + priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH); if (IS_ERR(priv->gpiod_pwdn)) @@ -1362,7 +1445,13 @@ static int max9286_probe(struct i2c_client *client) ret = max9286_parse_dt(priv); if (ret) - goto err_powerdown; + goto err_cleanup_dt; + + if (!priv->use_gpio_poc) { + ret = max9286_get_poc_supplies(priv); + if (ret) + goto err_cleanup_dt; + } ret = max9286_init(priv); if (ret < 0)