From patchwork Thu Dec 16 22:09:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 12682843 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 43F80C43219 for ; Thu, 16 Dec 2021 22:09:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241200AbhLPWJ5 (ORCPT ); Thu, 16 Dec 2021 17:09:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39872 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241209AbhLPWJ5 (ORCPT ); Thu, 16 Dec 2021 17:09:57 -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 16B54C06173E; Thu, 16 Dec 2021 14:09:57 -0800 (PST) Received: from pendragon.lan (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 101731209; Thu, 16 Dec 2021 23:09:54 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1639692595; bh=hLx2ebGM+okJSxhT9tMuHTZ4OjNTfkXx4j7pZttIUKE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Eojp+s6GwxFap4MUY9/OxkeNvEHiR/ayZjI8puA3E1TLCD1zgcjRJ1va2i2gG5S/q KEF5YZw68mDOce5QbqKNSWNyNTGW/iGHSj6LZ2TefD7X4Q7R1g2XelZac4sCcqzFnp WlgnGeMjKlOGGoyLqN0lBVvez5HTDvairtxv7eXc= From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Jacopo Mondi , Kieran Bingham , =?utf-8?q?Niklas_?= =?utf-8?q?S=C3=B6derlund?= , Thomas Nizan Subject: [PATCH 2/3] media: i2c: max9286: Add support for port regulators Date: Fri, 17 Dec 2021 00:09:45 +0200 Message-Id: <20211216220946.20771-3-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211216220946.20771-1-laurent.pinchart+renesas@ideasonboard.com> References: <20211216220946.20771-1-laurent.pinchart+renesas@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@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: Laurent Pinchart Signed-off-by: Thomas Nizan --- drivers/media/i2c/max9286.c | 112 +++++++++++++++++++++++++++++++----- 1 file changed, 98 insertions(+), 14 deletions(-) diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c index 7c663fd587bb..fa2f6a823fe6 100644 --- a/drivers/media/i2c/max9286.c +++ b/drivers/media/i2c/max9286.c @@ -136,8 +136,10 @@ #define MAX9286_SRC_PAD 4 struct max9286_source { + unsigned int index; struct v4l2_subdev *sd; struct fwnode_handle *fwnode; + struct regulator *regulator; }; struct max9286_asd { @@ -1072,6 +1074,49 @@ static int max9286_register_gpio(struct max9286_priv *priv) return ret; } +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); + + /* Otherwise use the per-port regulators. */ + for_each_source(priv, source) { + ret = regulator_enable(source->regulator); + if (ret < 0) + goto error; + + enabled |= BIT(source->index); + } + + return 0; + +error: + for_each_source(priv, source) { + if (enabled & BIT(source->index)) + regulator_disable(source->regulator); + } + + return ret; +} + +static void max9286_poc_power_off(struct max9286_priv *priv) +{ + struct max9286_source *source; + + if (priv->regulator) { + regulator_disable(priv->regulator); + return; + } + + for_each_source(priv, source) + regulator_disable(source->regulator); +} + static int max9286_init(struct device *dev) { struct max9286_priv *priv; @@ -1082,9 +1127,9 @@ static int max9286_init(struct device *dev) priv = i2c_get_clientdata(client); /* Enable the bus power. */ - ret = regulator_enable(priv->regulator); + ret = max9286_poc_power_on(priv); if (ret < 0) { - dev_err(&client->dev, "Unable to turn PoC on\n"); + dev_err(dev, "Unable to turn PoC on\n"); return ret; } @@ -1118,7 +1163,7 @@ static int max9286_init(struct device *dev) err_v4l2_register: max9286_v4l2_unregister(priv); err_regulator: - regulator_disable(priv->regulator); + max9286_poc_power_off(priv); return ret; } @@ -1215,6 +1260,7 @@ static int max9286_parse_dt(struct max9286_priv *priv) } source = &priv->sources[ep.port]; + source->index = ep.port; source->fwnode = fwnode_graph_get_remote_endpoint( of_fwnode_handle(node)); if (!source->fwnode) { @@ -1249,6 +1295,50 @@ 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; + + /* + * Start by getting the global regulator. Usage of the exclusive API is + * required to receive an error in case the supply isn't specified in + * the device tree. + */ + priv->regulator = devm_regulator_get_exclusive(dev, "poc"); + if (!IS_ERR(priv->regulator)) + return 0; + + if (PTR_ERR(priv->regulator) != -ENODEV) { + 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); + } + + /* 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) { + char name[10]; + + snprintf(name, sizeof(name), "port%u-poc", source->index); + source->regulator = devm_regulator_get_exclusive(dev, name); + if (IS_ERR(source->regulator)) { + if (PTR_ERR(source->regulator) != -EPROBE_DEFER) + dev_err(dev, + "Unable to get port %u PoC regulator: %ld\n", + source->index, + PTR_ERR(source->regulator)); + return PTR_ERR(source->regulator); + } + } + + return 0; +} + static int max9286_probe(struct i2c_client *client) { struct max9286_priv *priv; @@ -1293,17 +1383,11 @@ static int max9286_probe(struct i2c_client *client) 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_cleanup_dt; + + ret = max9286_get_poc_supplies(priv); if (ret) goto err_powerdown; @@ -1329,7 +1413,7 @@ static int max9286_remove(struct i2c_client *client) max9286_v4l2_unregister(priv); - regulator_disable(priv->regulator); + max9286_poc_power_off(priv); gpiod_set_value_cansleep(priv->gpiod_pwdn, 0);