From patchwork Sat Jan 1 18:28:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 12702126 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 5A059C4167B for ; Sat, 1 Jan 2022 18:28:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232644AbiAAS2W (ORCPT ); Sat, 1 Jan 2022 13:28:22 -0500 Received: from perceval.ideasonboard.com ([213.167.242.64]:41396 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232662AbiAAS2V (ORCPT ); Sat, 1 Jan 2022 13:28:21 -0500 Received: from pendragon.lan (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 733671C05; Sat, 1 Jan 2022 19:28:19 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1641061700; bh=IjEZByg+EYOjp53P6k2Hf4M2XaAnkA1LCq9LArT6bac=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dINaZ6xqNw9FJZ2LW9C3wBM9BZOLkcVygwCK09qm2+Mzz79RtcSmg6bH3VtM99D7I I9ZCDo+VQQyvCUWal4+BLLxgdcR0Lz0MAgc16gfqEw1zeki4PSSvQ4jVMHDANxpzks UGavg515ASneek2d/j7vMcbeUN0KKyNHd95ExdJE= 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 Subject: [PATCH v2 09/11] media: i2c: max9286: Configure remote I2C speed from device tree Date: Sat, 1 Jan 2022 20:28:04 +0200 Message-Id: <20220101182806.19311-10-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220101182806.19311-1-laurent.pinchart+renesas@ideasonboard.com> References: <20220101182806.19311-1-laurent.pinchart+renesas@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org Read the maxim,i2c-clock-frequency DT property that specifies the speed of the remote I2C bus, and configure the MAX9286 accordingly. The remote serializers must all have a matching configuration. Signed-off-by: Laurent Pinchart --- drivers/media/i2c/max9286.c | 56 +++++++++++++++++++++++++++++++------ 1 file changed, 47 insertions(+), 9 deletions(-) diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c index 4b69bd036ca6..d88a4d8e63ab 100644 --- a/drivers/media/i2c/max9286.c +++ b/drivers/media/i2c/max9286.c @@ -143,6 +143,11 @@ struct max9286_format_info { u8 datatype; }; +struct max9286_i2c_speed { + u32 rate; + u8 mstbt; +}; + struct max9286_source { struct v4l2_subdev *sd; struct fwnode_handle *fwnode; @@ -176,6 +181,7 @@ struct max9286_priv { /* The initial reverse control channel amplitude. */ u32 init_rev_chan_mv; u32 rev_chan_mv; + u8 i2c_mstbt; struct v4l2_ctrl_handler ctrls; struct v4l2_ctrl *pixelrate_ctrl; @@ -250,6 +256,17 @@ static const struct max9286_format_info max9286_formats[] = { }, }; +static const struct max9286_i2c_speed max9286_i2c_speeds[] = { + { .rate = 8470, .mstbt = MAX9286_I2CMSTBT_8KBPS }, + { .rate = 28300, .mstbt = MAX9286_I2CMSTBT_28KBPS }, + { .rate = 84700, .mstbt = MAX9286_I2CMSTBT_84KBPS }, + { .rate = 105000, .mstbt = MAX9286_I2CMSTBT_105KBPS }, + { .rate = 173000, .mstbt = MAX9286_I2CMSTBT_173KBPS }, + { .rate = 339000, .mstbt = MAX9286_I2CMSTBT_339KBPS }, + { .rate = 533000, .mstbt = MAX9286_I2CMSTBT_533KBPS }, + { .rate = 837000, .mstbt = MAX9286_I2CMSTBT_837KBPS }, +}; + /* ----------------------------------------------------------------------------- * I2C IO */ @@ -370,7 +387,7 @@ static int max9286_i2c_mux_init(struct max9286_priv *priv) static void max9286_configure_i2c(struct max9286_priv *priv, bool localack) { u8 config = MAX9286_I2CSLVSH_469NS_234NS | MAX9286_I2CSLVTO_1024US | - MAX9286_I2CMSTBT_105KBPS; + priv->i2c_mstbt; if (localack) config |= MAX9286_I2CLOCACK; @@ -1320,6 +1337,8 @@ static int max9286_parse_dt(struct max9286_priv *priv) struct device_node *node = NULL; unsigned int i2c_mux_mask = 0; u32 reverse_channel_microvolt; + u32 i2c_clk_freq = 105000; + unsigned int i; /* Balance the of_node_put() performed by of_find_node_by_name(). */ of_node_get(dev->of_node); @@ -1410,6 +1429,23 @@ static int max9286_parse_dt(struct max9286_priv *priv) } of_node_put(node); + of_property_read_u32(dev->of_node, "maxim,i2c-clock-frequency", + &i2c_clk_freq); + for (i = 0; i < ARRAY_SIZE(max9286_i2c_speeds); ++i) { + const struct max9286_i2c_speed *speed = &max9286_i2c_speeds[i]; + + if (speed->rate == i2c_clk_freq) { + priv->i2c_mstbt = speed->mstbt; + break; + } + } + + if (i == ARRAY_SIZE(max9286_i2c_speeds)) { + dev_err(dev, "Invalid %s value %u\n", + "maxim,i2c-clock-frequency", i2c_clk_freq); + return -EINVAL; + } + /* * Parse the initial value of the reverse channel amplitude from * the firmware interface and convert it to millivolts. @@ -1484,10 +1520,16 @@ static int max9286_probe(struct i2c_client *client) priv->client = client; i2c_set_clientdata(client, priv); + ret = max9286_parse_dt(priv); + if (ret) + goto err_cleanup_dt; + priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH); - if (IS_ERR(priv->gpiod_pwdn)) - return PTR_ERR(priv->gpiod_pwdn); + if (IS_ERR(priv->gpiod_pwdn)) { + ret = PTR_ERR(priv->gpiod_pwdn); + goto err_cleanup_dt; + } gpiod_set_consumer_name(priv->gpiod_pwdn, "max9286-pwdn"); gpiod_set_value_cansleep(priv->gpiod_pwdn, 1); @@ -1514,10 +1556,6 @@ static int max9286_probe(struct i2c_client *client) if (ret) goto err_powerdown; - ret = max9286_parse_dt(priv); - if (ret) - goto err_cleanup_dt; - ret = max9286_get_poc_supplies(priv); if (ret) goto err_cleanup_dt; @@ -1528,10 +1566,10 @@ static int max9286_probe(struct i2c_client *client) return 0; -err_cleanup_dt: - max9286_cleanup_dt(priv); err_powerdown: gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); +err_cleanup_dt: + max9286_cleanup_dt(priv); return ret; }