From patchwork Wed Apr 8 11:08:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robert Foss X-Patchwork-Id: 11479799 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C100E17D4 for ; Wed, 8 Apr 2020 11:08:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9879D20780 for ; Wed, 8 Apr 2020 11:08:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="L5kDuOec" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728334AbgDHLId (ORCPT ); Wed, 8 Apr 2020 07:08:33 -0400 Received: from mail-wm1-f65.google.com ([209.85.128.65]:36307 "EHLO mail-wm1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728232AbgDHLIa (ORCPT ); Wed, 8 Apr 2020 07:08:30 -0400 Received: by mail-wm1-f65.google.com with SMTP id d202so4996822wmd.1 for ; Wed, 08 Apr 2020 04:08:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=IUNFIM4tJIflmczFsSMqJ1YMyCdkqcCqkHsbt7Hulfo=; b=L5kDuOec69USIK0cUeccqs5mm+lP6Br4kH8AWPjkuxQtC8DOHvjS5CHZMmkiPLsBd6 vu0U7UpCqd9dp1GJ2SXKP6jofSWHf9IrnDLWN+z+YXqvdecFt6Xjhoqgr5PiUj5yj21d Zzvd4hh1anmA6DsN0bbydIsB7p4ci56XXLPWoiZW6k9LLDj4OZJbbH19qdYJoq85dU2P C5W8fraE4Mv3EgEYM/YO/x8zeqOdNmP8Btx8e9V14GCR9L38KDf/YkAwQBN9PZEW8AiF 9PQJbfyGbyHm7VlQl6ehyVI9d60PGtT3X5tbe0wJAJQC58tr5HX+Uo4UZ2u7tfZAw2Li 5S8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=IUNFIM4tJIflmczFsSMqJ1YMyCdkqcCqkHsbt7Hulfo=; b=VAsl/tryUEkpJg1krtMgeAwA9Nj/XKzb8H11/UemP2F8zD/V3Lw7EaEyjH3imeJZcz L69iiwbQDPreCRAHJVgUTA/j1h89v6CC66uhRCkbB5s8CrktlFCmxMj60RRfzWCcHmcL JyN8OyDNq7uKxIKBhMY0u1p9GDVKi04t2y0UqYT9jC+NpraXfNJ75zm7KPldwRmTHb/O IbuN3uJm2U6RxoyD5siBxNbA40MgxXDRS1uYGKelmaD7Gs+Y+YQqvYevvxDSr0s+gCdg h6Cw+dz2wZbCCMpGD6LT/fXX9toSNIqiffuoF+Rw9sAdW59QxflP5z57Vywkvg54sEz5 nAYQ== X-Gm-Message-State: AGi0PuaQuJYtECa2kTp7+wwMRCi+oIY+IhjCVYKpj2AArI7VF2x1N7Qr +pwc9wWRNwTpC61FZVAX8m4d1yeJLMC5RQ== X-Google-Smtp-Source: APiQypLqRpydvZrHRauRJnFjJpmqKZYAUWKcpkg1CHL2up7wZqe4uqNNZCCB7mJ0OySGEUNslXamtA== X-Received: by 2002:a1c:7415:: with SMTP id p21mr4070181wmc.93.1586344105926; Wed, 08 Apr 2020 04:08:25 -0700 (PDT) Received: from localhost.localdomain ([37.120.50.78]) by smtp.gmail.com with ESMTPSA id i8sm37596253wrb.41.2020.04.08.04.08.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Apr 2020 04:08:25 -0700 (PDT) From: Robert Foss To: Dongchun Zhu , Fabio Estevam , Andy Shevchenko , Sakari Ailus , Marco Felsch , Tomasz Figa , Maxime Ripard , linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Robert Foss Subject: [PATCH v4 2/3] media: ov8856: Add devicetree support Date: Wed, 8 Apr 2020 13:08:15 +0200 Message-Id: <20200408110816.2712841-3-robert.foss@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200408110816.2712841-1-robert.foss@linaro.org> References: <20200408110816.2712841-1-robert.foss@linaro.org> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add match table, enable ov8856_probe() to support both ACPI and DT modes. ACPI and DT modes are primarily distinguished from each other by relying on devm_XXX_get_optional() will return NULL instead of a reference for the desired managed resource. Signed-off-by: Robert Foss --- - Changes since v3: * Remove redundant {}-brackets * Compare xvclk_rate to 5% tolerance * Andy: Use dev_fwnode() * Andy: Use %pe instead of %ld + PTR_ERR() * Andy: Invert reset_gpio logic * Andy: Remove dev_dbg() from failing reset_gpio setup * Andy: Use dev_err for logging for failures * Andy: Remove dev_warn from EDEFER/regulator error path * Andy & Sakari: Replaced GPIOD_OUT_XXX with 0/1 * Maxime & Sakari: Verify clock frequency from DT * Sakari: Verify the 'xvclk_rate' is set correctly for ACPI/DT devices * Sakari: Remove duplicate ov8856->dev assignment - Changes since v2: * Added "struct device *dev" member to struct ov8856 * Andy: Switch to optional version of devm_gpiod_get * Andy: Switch to optional version of devm_clk_get * Fabio: Add reset sleep period * Sakari: Unify defines for 19.2Mhz * Sakari: Remove 24Mhz clock, since it isn't needed for supported modes * Sakari: Replace dev_info() with dev_dbg() * Sakari: Switch induction variable type to unsigned * Sakari: Don't wait for reset_gpio when in ACPI mode * Sakari: Pull reset GPIO high on power on failure * Sakari: Add power on/off to resume/suspend * Sakari: Fix indentation * Sakari: Power off during ov8856_remove() * Sakari: Don't sleep during power-on in ACPI mode * Sakari: Switch to getting xvclk from clk_get_rate - Changes since v1: * Andy & Sakari: Make XVCLK optional since to not break ACPI * Fabio: Change n_shutdown_gpio name to reset_gpio * Fabio: Invert reset_gpio due to GPIO_ACTIVE_HIGH -> GPIO_ACTIVE_LOW change * Fabio: Remove empty line * Fabio: Remove real error from devm_gpiod_get() failures * Sakari: ARRAY_SIZE() directly instead of through OV8856_NUM_SUPPLIES * Sakari: Use XVCLK rate as provided by DT drivers/media/i2c/ov8856.c | 143 +++++++++++++++++++++++++++++++++---- 1 file changed, 128 insertions(+), 15 deletions(-) diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c index 8655842af275..473d3245344a 100644 --- a/drivers/media/i2c/ov8856.c +++ b/drivers/media/i2c/ov8856.c @@ -3,10 +3,13 @@ #include #include +#include #include +#include #include #include #include +#include #include #include #include @@ -18,7 +21,7 @@ #define OV8856_LINK_FREQ_360MHZ 360000000ULL #define OV8856_LINK_FREQ_180MHZ 180000000ULL #define OV8856_SCLK 144000000ULL -#define OV8856_MCLK 19200000 +#define OV8856_XVCLK_19_2 19200000 #define OV8856_DATA_LANES 4 #define OV8856_RGB_DEPTH 10 @@ -64,6 +67,12 @@ #define to_ov8856(_sd) container_of(_sd, struct ov8856, sd) +static const char * const ov8856_supply_names[] = { + "dovdd", /* Digital I/O power */ + "avdd", /* Analog power */ + "dvdd", /* Digital core power */ +}; + enum { OV8856_LINK_FREQ_720MBPS, OV8856_LINK_FREQ_360MBPS, @@ -566,6 +575,11 @@ struct ov8856 { struct media_pad pad; struct v4l2_ctrl_handler ctrl_handler; + struct device *dev; + struct clk *xvclk; + struct gpio_desc *reset_gpio; + struct regulator_bulk_data supplies[ARRAY_SIZE(ov8856_supply_names)]; + /* V4L2 Controls */ struct v4l2_ctrl *link_freq; struct v4l2_ctrl *pixel_rate; @@ -908,6 +922,52 @@ static int ov8856_set_stream(struct v4l2_subdev *sd, int enable) return ret; } +static int __ov8856_power_on(struct ov8856 *ov8856) +{ + struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd); + int ret; + + ret = clk_prepare_enable(ov8856->xvclk); + if (ret < 0) { + dev_err(&client->dev, "failed to enable xvclk\n"); + return ret; + } + + if (is_acpi_node(dev_fwnode(ov8856->dev))) + return 0; + + if (ov8856->reset_gpio) { + gpiod_set_value_cansleep(ov8856->reset_gpio, 1); + usleep_range(1000, 2000); + } + + ret = regulator_bulk_enable(ARRAY_SIZE(ov8856_supply_names), + ov8856->supplies); + if (ret < 0) { + dev_err(&client->dev, "failed to enable regulators\n"); + goto disable_clk; + } + + gpiod_set_value_cansleep(ov8856->reset_gpio, 0); + usleep_range(1500, 1800); + + return 0; + +disable_clk: + gpiod_set_value_cansleep(ov8856->reset_gpio, 1); + clk_disable_unprepare(ov8856->xvclk); + + return ret; +} + +static void __ov8856_power_off(struct ov8856 *ov8856) +{ + gpiod_set_value_cansleep(ov8856->reset_gpio, 1); + regulator_bulk_disable(ARRAY_SIZE(ov8856_supply_names), + ov8856->supplies); + clk_disable_unprepare(ov8856->xvclk); +} + static int __maybe_unused ov8856_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); @@ -918,6 +978,7 @@ static int __maybe_unused ov8856_suspend(struct device *dev) if (ov8856->streaming) ov8856_stop_streaming(ov8856); + __ov8856_power_off(ov8856); mutex_unlock(&ov8856->mutex); return 0; @@ -931,6 +992,8 @@ static int __maybe_unused ov8856_resume(struct device *dev) int ret; mutex_lock(&ov8856->mutex); + + __ov8856_power_on(ov8856); if (ov8856->streaming) { ret = ov8856_start_streaming(ov8856); if (ret) { @@ -1092,29 +1155,58 @@ static int ov8856_identify_module(struct ov8856 *ov8856) return 0; } -static int ov8856_check_hwcfg(struct device *dev) +static int ov8856_get_hwcfg(struct ov8856 *ov8856) { + struct device *dev = ov8856->dev; struct fwnode_handle *ep; struct fwnode_handle *fwnode = dev_fwnode(dev); struct v4l2_fwnode_endpoint bus_cfg = { .bus_type = V4L2_MBUS_CSI2_DPHY }; - u32 mclk; + u32 xvclk_rate; int ret; unsigned int i, j; if (!fwnode) return -ENXIO; - ret = fwnode_property_read_u32(fwnode, "clock-frequency", &mclk); - if (ret) - return ret; + if (is_acpi_node(fwnode)) { + ret = fwnode_property_read_u32(fwnode, "clock-frequency", + &xvclk_rate); + if (ret) + return ret; + } else { + ov8856->xvclk = devm_clk_get(dev, "xvclk"); + if (IS_ERR(ov8856->xvclk)) { + dev_err(dev, "could not get xvclk clock (%pe)\n", + ov8856->xvclk); + return PTR_ERR(ov8856->xvclk); + } + + xvclk_rate = clk_get_rate(ov8856->xvclk); + } - if (mclk != OV8856_MCLK) { - dev_err(dev, "external clock %d is not supported", mclk); + /* external clock must be 19.2MHz, allow 5% tolerance */ + if (xvclk_rate < OV8856_XVCLK_19_2 * 0.95 || + xvclk_rate > OV8856_XVCLK_19_2 * 1.05) { + dev_err(dev, "external clock %d is not supported", xvclk_rate); return -EINVAL; } + + ov8856->reset_gpio = devm_gpiod_get_optional(dev, "reset", + GPIOD_OUT_LOW); + if (IS_ERR(ov8856->reset_gpio)) + return PTR_ERR(ov8856->reset_gpio); + + for (i = 0; i < ARRAY_SIZE(ov8856_supply_names); i++) + ov8856->supplies[i].supply = ov8856_supply_names[i]; + + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ov8856_supply_names), + ov8856->supplies); + if (ret) + return ret; + ep = fwnode_graph_get_next_endpoint(fwnode, NULL); if (!ep) return -ENXIO; @@ -1169,6 +1261,8 @@ static int ov8856_remove(struct i2c_client *client) pm_runtime_disable(&client->dev); mutex_destroy(&ov8856->mutex); + __ov8856_power_off(ov8856); + return 0; } @@ -1177,22 +1271,31 @@ static int ov8856_probe(struct i2c_client *client) struct ov8856 *ov8856; int ret; - ret = ov8856_check_hwcfg(&client->dev); + ov8856 = devm_kzalloc(&client->dev, sizeof(*ov8856), GFP_KERNEL); + if (!ov8856) + return -ENOMEM; + + ov8856->dev = &client->dev; + + ret = ov8856_get_hwcfg(ov8856); if (ret) { - dev_err(&client->dev, "failed to check HW configuration: %d", + dev_err(&client->dev, "failed to get HW configuration: %d", ret); return ret; } - ov8856 = devm_kzalloc(&client->dev, sizeof(*ov8856), GFP_KERNEL); - if (!ov8856) - return -ENOMEM; - v4l2_i2c_subdev_init(&ov8856->sd, client, &ov8856_subdev_ops); + + ret = __ov8856_power_on(ov8856); + if (ret) { + dev_err(&client->dev, "failed to power on\n"); + return ret; + } + ret = ov8856_identify_module(ov8856); if (ret) { dev_err(&client->dev, "failed to find sensor: %d", ret); - return ret; + goto probe_power_off; } mutex_init(&ov8856->mutex); @@ -1238,6 +1341,9 @@ static int ov8856_probe(struct i2c_client *client) v4l2_ctrl_handler_free(ov8856->sd.ctrl_handler); mutex_destroy(&ov8856->mutex); +probe_power_off: + __ov8856_power_off(ov8856); + return ret; } @@ -1254,11 +1360,18 @@ static const struct acpi_device_id ov8856_acpi_ids[] = { MODULE_DEVICE_TABLE(acpi, ov8856_acpi_ids); #endif +static const struct of_device_id ov8856_of_match[] = { + { .compatible = "ovti,ov8856" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, ov8856_of_match); + static struct i2c_driver ov8856_i2c_driver = { .driver = { .name = "ov8856", .pm = &ov8856_pm_ops, .acpi_match_table = ACPI_PTR(ov8856_acpi_ids), + .of_match_table = ov8856_of_match, }, .probe_new = ov8856_probe, .remove = ov8856_remove,