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[23.128.96.18]) by mx.google.com with ESMTP id h2si1083305pfc.321.2021.04.14.17.51.18; Wed, 14 Apr 2021 17:51:29 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass (test mode) header.i=@ideasonboard.com header.s=mail header.b=IAQ2ExJh; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230402AbhDOABX (ORCPT + 99 others); Wed, 14 Apr 2021 20:01:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46248 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230363AbhDOABV (ORCPT ); Wed, 14 Apr 2021 20:01:21 -0400 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 4C6DFC061574; Wed, 14 Apr 2021 17:00:59 -0700 (PDT) Received: from pendragon.ideasonboard.com (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 8F52151E; Thu, 15 Apr 2021 02:00:57 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1618444857; bh=fm3K/7qYN/h/SZQMNfBTmltjSZNJfyOqx0GhaMvN27s=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=IAQ2ExJhcZlh8SSRpg6mXSZmqXxBqRpNNOvs4jSfHtN6vKway+5L5J9ULIoTnjw6J n050heOdHpeiJFgqgy8JsY60naS6hzZyiL0hhekQ/ex6PN/XgPb1Z/2kYIz1tMp9NS Yi9YfJJV/D9KB15HtcbCVwrE1GPPCeVTzM7KVbu0= Date: Thu, 15 Apr 2021 03:00:56 +0300 From: Laurent Pinchart To: Jacopo Mondi Cc: Geert Uytterhoeven , Magnus Damm , Kieran Bingham , Rob Herring , linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 2/5] media: i2c: max9286: Use "maxim,gpio-poc" property Message-ID: References: <20210414135128.180980-1-jacopo+renesas@jmondi.org> <20210414135128.180980-3-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20210414135128.180980-3-jacopo+renesas@jmondi.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Jacopo, Thank you for the patch. On Wed, Apr 14, 2021 at 03:51:25PM +0200, Jacopo Mondi wrote: > 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 introduce s/introduce/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. I would have split the patch in two, with a first patch that refactors the code, and a second one that extends it, but that's no big deal. > Signed-off-by: Jacopo Mondi > --- > drivers/media/i2c/max9286.c | 125 +++++++++++++++++++++++++++--------- > 1 file changed, 96 insertions(+), 29 deletions(-) > > diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c > index 6fd4d59fcc72..0c125f7b3d9b 100644 > --- a/drivers/media/i2c/max9286.c > +++ b/drivers/media/i2c/max9286.c > @@ -15,6 +15,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -165,6 +166,9 @@ struct max9286_priv { > > u32 reverse_channel_mv; > > + u32 gpio_poc; > + u32 gpio_poc_flags; > + > struct v4l2_ctrl_handler ctrls; > struct v4l2_ctrl *pixelrate; > > @@ -1022,20 +1026,27 @@ 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 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_gpio_get(struct gpio_chip *chip, unsigned int offset) > +static int max9286_gpiochip_get(struct gpio_chip *chip, unsigned int offset) > { > struct max9286_priv *priv = gpiochip_get_data(chip); > > @@ -1055,8 +1066,8 @@ 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 */ > @@ -1069,6 +1080,75 @@ 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; > + u32 gpio_poc[2]; > + int ret; > + > + /* > + * Parse the "gpio-poc" vendor property. If the camera power is > + * controlled by one of the MAX9286 gpio lines, do not register > + * the gpio controller and ignore 'poc-supply'. > + */ > + ret = of_property_read_u32_array(dev->of_node, > + "maxim,gpio-poc", gpio_poc, 2); > + if (!ret) { > + priv->gpio_poc = gpio_poc[0]; > + priv->gpio_poc_flags = gpio_poc[1]; > + if ((priv->gpio_poc != 0 && priv->gpio_poc != 1) || You could simply test priv->gpio_poc > 1. > + (priv->gpio_poc_flags != GPIO_ACTIVE_HIGH && > + priv->gpio_poc_flags != GPIO_ACTIVE_LOW)) { > + dev_err(dev, "Invalid 'gpio-poc': (%u %u)\n", > + priv->gpio_poc, priv->gpio_poc_flags); > + return -EINVAL; > + } > + > + /* GPIO values default to high */ > + priv->gpio_state = BIT(0) | BIT(1); Why is that ? > + priv->regulator = NULL; As priv is initialized to 0, you can skip this. > + > + return 0; > + } > + > + 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; > +} > + > +static int max9286_poc_enable(struct max9286_priv *priv, bool enable) > +{ > + int ret; > + > + /* If "poc-gpio" is used, toggle the line and do not use regulator. */ > + if (!priv->regulator) > + return max9286_gpio_set(priv, priv->gpio_poc, > + enable ^ priv->gpio_poc_flags); > + > + /* Otherwise PoC is controlled using a regulator. */ > + if (enable) { > + ret = regulator_enable(priv->regulator); > + if (ret < 0) { > + dev_err(&priv->client->dev, "Unable to turn PoC on\n"); As error message when max9286_gpio_set() fails (at least in the enable case) would be good too. Bonus points if there's a single dev_err() call. > + return ret; > + } > + > + return 0; > + } > + > + return regulator_disable(priv->regulator); > +} > + > static int max9286_init(struct device *dev) > { > struct max9286_priv *priv; > @@ -1078,17 +1158,14 @@ 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; > } > > /* > @@ -1098,7 +1175,7 @@ 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); > @@ -1114,8 +1191,8 @@ 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; > } > @@ -1286,20 +1363,10 @@ 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; > @@ -1326,7 +1393,7 @@ 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); > -- Regards, Laurent Pinchart