From patchwork Tue Mar 31 13:33:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robert Foss X-Patchwork-Id: 11467869 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 3751592A for ; Tue, 31 Mar 2020 13:34:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0C31C214D8 for ; Tue, 31 Mar 2020 13:34:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="vN0Lq4Po" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731027AbgCaNd7 (ORCPT ); Tue, 31 Mar 2020 09:33:59 -0400 Received: from mail-wr1-f66.google.com ([209.85.221.66]:37395 "EHLO mail-wr1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731000AbgCaNd7 (ORCPT ); Tue, 31 Mar 2020 09:33:59 -0400 Received: by mail-wr1-f66.google.com with SMTP id w10so26051168wrm.4 for ; Tue, 31 Mar 2020 06:33:57 -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=nW0Q9tddO1TQwMe/6Sxs0mws5s6HTicDjbPL5GWcTfM=; b=vN0Lq4PoSUCgwTZFIwoomfjq/gMvf6CJLO+56ryNRCdWLX85QayyrvQ4Ow8LR1M/W3 +xfETMsgc/ESrIp18kWsegvwcaSFWV2teZ7XkSOoxw2g7pOBJ8z7R9K/8jtnyznbMOZb 4ZowSKl4taiuNtC0minEncGPpIyItLBbW7uzi1WUHARq5QQekmCHyXHFD3Wsew9Ydl3l lpFNVDF0m2+PF0FZ/WNWNr6bU4vaKkNy+UQMF7dvz9PhQhaeonGjwrpVx1tzkpzdD4by /onq5r2n9EGwKg6qmQROUHrEcBxNCz6M4lBFbiTLxCspmouK3eV9TLaJS4QPuJgsqqqL uEcA== 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=nW0Q9tddO1TQwMe/6Sxs0mws5s6HTicDjbPL5GWcTfM=; b=UfdUC0dr1w3VI3c75b3Z85b4slRsSDK6eLkj7s80Ener/A6MvKQr8+SOyzv+yzH+9Q 9XmmvDYFFAL8KF/Z+G1cg20vuiAbJqEeNNlfRhXmZ3bN7zF0CtE/TYcFMWOSOgbcaI7R l7gHE1H1P9gnEHPCKrVo533TaccWDb24XPcQ+iN2Cuc8J+oGFhVIfPBvnw5ALiGc2uOl Ouq0dKze/cDovK247Y2MWtBhmnnf61CBszhPqRNbeSBh6X9pRWyOZcFMw4tS0UbGN8L2 vbfV07t8LNszhWwj4O3OBAdMTX8QALzSUoi3MNUV7WDdKgCJUAHL3vo+7fodJYpaeLDC yF5g== X-Gm-Message-State: ANhLgQ1vwr1TbEJ8VMK6uF1LWKHSy9PKVgUYP8Az+/BJnXQqU2A9puEf UEvmZpJe62mZUB0s0pn9N40EXg== X-Google-Smtp-Source: ADFU+vup82VG95GD/mSQV2aDWAVY3NVVevW5FpzCgJSYqYy0/+aFDQpRoopEVo9XTGqdi//VSIymGw== X-Received: by 2002:adf:afdb:: with SMTP id y27mr20804472wrd.208.1585661637198; Tue, 31 Mar 2020 06:33:57 -0700 (PDT) Received: from localhost.localdomain ([37.120.50.78]) by smtp.gmail.com with ESMTPSA id 61sm28623081wrn.82.2020.03.31.06.33.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Mar 2020 06:33:56 -0700 (PDT) From: Robert Foss To: Dongchun Zhu , Fabio Estevam , Andy Shevchenko , Sakari Ailus , Tomasz Figa , 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 v6 1/3] media: dt-bindings: ov8856: Document YAML bindings Date: Tue, 31 Mar 2020 15:33:44 +0200 Message-Id: <20200331133346.372517-2-robert.foss@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200331133346.372517-1-robert.foss@linaro.org> References: <20200331133346.372517-1-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 From: Dongchun Zhu This patch adds documentation of device tree in YAML schema for the OV8856 CMOS image sensor. Signed-off-by: Dongchun Zhu Signed-off-by: Robert Foss --- - Changes since v5: * Add assigned-clocks and assigned-clock-rates * robher: dt-schema errors - Changes since v4: * Fabio: Change reset-gpio to GPIO_ACTIVE_LOW, explain in description * Add clock-lanes property to example * robher: Fix syntax error in devicetree example - Changes since v3: * robher: Fix syntax error * robher: Removed maxItems * Fixes yaml 'make dt-binding-check' errors - Changes since v2: Fixes comments from from Andy, Tomasz, Sakari, Rob. * Convert text documentation to YAML schema. - Changes since v1: Fixes comments from Sakari, Tomasz * Add clock-frequency and link-frequencies in DT .../devicetree/bindings/media/i2c/ov8856.yaml | 150 ++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 151 insertions(+) create mode 100644 Documentation/devicetree/bindings/media/i2c/ov8856.yaml diff --git a/Documentation/devicetree/bindings/media/i2c/ov8856.yaml b/Documentation/devicetree/bindings/media/i2c/ov8856.yaml new file mode 100644 index 000000000000..beeddfbb8709 --- /dev/null +++ b/Documentation/devicetree/bindings/media/i2c/ov8856.yaml @@ -0,0 +1,150 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +# Copyright (c) 2019 MediaTek Inc. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/media/i2c/ov8856.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Omnivision OV8856 CMOS Sensor Device Tree Bindings + +maintainers: + - Ben Kao + - Dongchun Zhu + +description: |- + The Omnivision OV8856 is a high performance, 1/4-inch, 8 megapixel, CMOS + image sensor that delivers 3264x2448 at 30fps. It provides full-frame, + sub-sampled, and windowed 10-bit MIPI images in various formats via the + Serial Camera Control Bus (SCCB) interface. This chip is programmable + through I2C and two-wire SCCB. The sensor output is available via CSI-2 + serial data output (up to 4-lane). + +properties: + compatible: + const: ovti,ov8856 + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + + clock-names: + description: + Input clock for the sensor. + items: + - const: xvclk + + clock-frequency: + description: + Frequency of the xvclk clock in Hertz. + + assigned-clocks: + description: + Input clock for the sensor. + + assigned-clock-rates: + description: + Frequency of the xvclk clock in Hertz. + + dovdd-supply: + description: + Definition of the regulator used as interface power supply. + + avdd-supply: + description: + Definition of the regulator used as analog power supply. + + dvdd-supply: + description: + Definition of the regulator used as digital power supply. + + reset-gpios: + description: + The phandle and specifier for the GPIO that controls sensor reset. + This corresponds to the hardware pin XSHUTDOWN which is physically + active low. + + port: + type: object + additionalProperties: false + description: + A node containing input and output port nodes with endpoint definitions + as documented in + Documentation/devicetree/bindings/media/video-interfaces.txt + + properties: + endpoint: + type: object + + properties: + clock-lanes: + maxItems: 1 + + data-lanes: + maxItems: 1 + + remote-endpoint: true + + required: + - clock-lanes + - data-lanes + - remote-endpoint + + required: + - endpoint + +required: + - compatible + - reg + - clocks + - clock-names + - clock-frequency + - assigned-clocks + - assigned-clock-rates + - dovdd-supply + - avdd-supply + - dvdd-supply + - reset-gpios + - port + +additionalProperties: false + +examples: + - | + #include + #include + + i2c { + #address-cells = <1>; + #size-cells = <0>; + + ov8856: camera@10 { + compatible = "ovti,ov8856"; + reg = <0x10>; + + reset-gpios = <&pio 111 GPIO_ACTIVE_LOW>; + pinctrl-names = "default"; + pinctrl-0 = <&clk_24m_cam>; + + clocks = <&clock_camcc CAM_CC_MCLK0_CLK>; + clock-names = "xvclk"; + clock-frequency = <19200000>; + assigned-clocks = <&clock_camcc CAM_CC_MCLK0_CLK>; + assigned-clock-rates = <19200000>; + + avdd-supply = <&mt6358_vcama2_reg>; + dvdd-supply = <&mt6358_vcamd_reg>; + dovdd-supply = <&mt6358_vcamio_reg>; + + port { + wcam_out: endpoint { + remote-endpoint = <&mipi_in_wcam>; + clock-lanes = <0>; + data-lanes = <1 2 3 4>; + link-frequencies = /bits/ 64 <360000000 180000000>; + }; + }; + }; + }; +... \ No newline at end of file diff --git a/MAINTAINERS b/MAINTAINERS index a6fbdf354d34..0f99e863978a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12355,6 +12355,7 @@ L: linux-media@vger.kernel.org T: git git://linuxtv.org/media_tree.git S: Maintained F: drivers/media/i2c/ov8856.c +F: Documentation/devicetree/bindings/media/i2c/ov8856.yaml OMNIVISION OV9650 SENSOR DRIVER M: Sakari Ailus From patchwork Tue Mar 31 13:33:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robert Foss X-Patchwork-Id: 11467873 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 84BDC92A for ; Tue, 31 Mar 2020 13:34:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 508C92173E for ; Tue, 31 Mar 2020 13:34:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="R5+7LH+5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731069AbgCaNeJ (ORCPT ); Tue, 31 Mar 2020 09:34:09 -0400 Received: from mail-wr1-f66.google.com ([209.85.221.66]:35701 "EHLO mail-wr1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731000AbgCaNeA (ORCPT ); Tue, 31 Mar 2020 09:34:00 -0400 Received: by mail-wr1-f66.google.com with SMTP id d5so26048837wrn.2 for ; 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Tue, 31 Mar 2020 06:33:58 -0700 (PDT) Received: from localhost.localdomain ([37.120.50.78]) by smtp.gmail.com with ESMTPSA id 61sm28623081wrn.82.2020.03.31.06.33.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Mar 2020 06:33:57 -0700 (PDT) From: Robert Foss To: Dongchun Zhu , Fabio Estevam , Andy Shevchenko , Sakari Ailus , Tomasz Figa , 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 v3 2/3] media: ov8856: Add devicetree support Date: Tue, 31 Mar 2020 15:33:45 +0200 Message-Id: <20200331133346.372517-3-robert.foss@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200331133346.372517-1-robert.foss@linaro.org> References: <20200331133346.372517-1-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 devicetree match table, and enable ov8856_probe() to initialize power, clocks and reset pins. Signed-off-by: Robert Foss --- - 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 | 141 ++++++++++++++++++++++++++++++++----- 1 file changed, 125 insertions(+), 16 deletions(-) diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c index 8655842af275..260aaf332631 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(ov8856->dev->fwnode)) + return 0; + + if (ov8856->reset_gpio) { + gpiod_set_value_cansleep(ov8856->reset_gpio, GPIOD_OUT_HIGH); + 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, GPIOD_OUT_LOW); + usleep_range(1500, 1800); + + return 0; + +disable_clk: + gpiod_set_value_cansleep(ov8856->reset_gpio, GPIOD_OUT_HIGH); + clk_disable_unprepare(ov8856->xvclk); + + return ret; +} + +static void __ov8856_power_off(struct ov8856 *ov8856) +{ + gpiod_set_value_cansleep(ov8856->reset_gpio, GPIOD_OUT_HIGH); + 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) { @@ -1092,27 +1155,52 @@ 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; + unsigned long 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; + ov8856->xvclk = devm_clk_get_optional(dev, "xvclk"); + if (IS_ERR(ov8856->xvclk)) { + dev_err(dev, "could not get xvclk clock (%ld)\n", + PTR_ERR(ov8856->xvclk)); + return PTR_ERR(ov8856->xvclk); + } - if (mclk != OV8856_MCLK) { - dev_err(dev, "external clock %d is not supported", mclk); - return -EINVAL; + if (ov8856->xvclk) { + xvclk_rate = clk_get_rate(ov8856->xvclk); + if (xvclk_rate != OV8856_XVCLK_19_2) { + dev_err(dev, "external clock %lu is not supported", + xvclk_rate); + return -EINVAL; + } + } + + ov8856->reset_gpio = devm_gpiod_get_optional(dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(ov8856->reset_gpio)) { + dev_dbg(dev, "failed to get reset-gpio\n"); + 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) { + dev_warn(dev, "failed to get regulators\n"); + return ret; } ep = fwnode_graph_get_next_endpoint(fwnode, NULL); @@ -1169,6 +1257,8 @@ 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 +1267,31 @@ 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; + + 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_warn(&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 +1337,9 @@ 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 +1356,18 @@ 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, From patchwork Tue Mar 31 13:33:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robert Foss X-Patchwork-Id: 11467871 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 0379992A for ; Tue, 31 Mar 2020 13:34:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D51AC20784 for ; 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Tue, 31 Mar 2020 06:33:59 -0700 (PDT) From: Robert Foss To: Dongchun Zhu , Fabio Estevam , Andy Shevchenko , Sakari Ailus , Tomasz Figa , 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 v3 3/3] media: ov8856: Implement sensor module revision identification Date: Tue, 31 Mar 2020 15:33:46 +0200 Message-Id: <20200331133346.372517-4-robert.foss@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200331133346.372517-1-robert.foss@linaro.org> References: <20200331133346.372517-1-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 Query the sensor for its module revision, and compare it to known revisions. Currently only the '1B' revision has been added. Signed-off-by: Robert Foss --- - Changes since v2: * Add module revision 2A * Sakari: Remove ov8856_check_revision() * Sakari: Stop EEPROM streaming mode drivers/media/i2c/ov8856.c | 51 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c index 260aaf332631..c7551cee2bb0 100644 --- a/drivers/media/i2c/ov8856.c +++ b/drivers/media/i2c/ov8856.c @@ -32,6 +32,18 @@ #define OV8856_MODE_STANDBY 0x00 #define OV8856_MODE_STREAMING 0x01 +/* define 1B module revision */ +#define OV8856_1B_MODULE 0x02 + +/* the OTP read-out buffer is at 0x7000 and 0xf is the offset + * of the byte in the OTP that means the module revision + */ +#define OV8856_MODULE_REVISION 0x700f +#define OV8856_OTP_MODE_CTRL 0x3d84 +#define OV8856_OTP_LOAD_CTRL 0x3d81 +#define OV8856_OTP_MODE_AUTO 0x00 +#define OV8856_OTP_LOAD_CTRL_ENABLE BIT(0) + /* vertical-timings from sensor */ #define OV8856_REG_VTS 0x380e #define OV8856_VTS_MAX 0x7fff @@ -1152,6 +1164,45 @@ static int ov8856_identify_module(struct ov8856 *ov8856) return -ENXIO; } + ret = ov8856_write_reg(ov8856, OV8856_REG_MODE_SELECT, + OV8856_REG_VALUE_08BIT, OV8856_MODE_STREAMING); + if (ret) + return ret; + + ret = ov8856_write_reg(ov8856, OV8856_OTP_MODE_CTRL, + OV8856_REG_VALUE_08BIT, OV8856_OTP_MODE_AUTO); + if (ret) { + dev_err(&client->dev, "failed to set otp mode"); + return ret; + } + + ret = ov8856_write_reg(ov8856, OV8856_OTP_LOAD_CTRL, + OV8856_REG_VALUE_08BIT, + OV8856_OTP_LOAD_CTRL_ENABLE); + if (ret) { + dev_err(&client->dev, "failed to enable load control"); + return ret; + } + + ret = ov8856_read_reg(ov8856, OV8856_MODULE_REVISION, + OV8856_REG_VALUE_08BIT, &val); + if (ret) { + dev_err(&client->dev, "failed to read module revision"); + return ret; + } + + dev_info(&client->dev, "OV8856 revision %x (%s) at address 0x%02x\n", + val, + val == OV8856_1B_MODULE ? "1B" : "unknown revision", + client->addr); + + ret = ov8856_write_reg(ov8856, OV8856_REG_MODE_SELECT, + OV8856_REG_VALUE_08BIT, OV8856_MODE_STANDBY); + if (ret) { + dev_err(&client->dev, "failed to exit streaming mode"); + return ret; + } + return 0; }