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X-OriginatorOrg: leica-geosystems.com.cn X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jul 2025 08:02:29.4751 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: beb198c8-2b94-431e-da0d-08ddca886fc0 X-MS-Exchange-CrossTenant-Id: 1b16ab3e-b8f6-4fe3-9f3e-2db7fe549f6a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=1b16ab3e-b8f6-4fe3-9f3e-2db7fe549f6a;Ip=[193.8.40.94];Helo=[hexagon.com] X-MS-Exchange-CrossTenant-AuthSource: AM2PEPF0001C70B.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR06MB7461 Content-Type: text/plain; charset="utf-8" Some PWM LED driver chips like TPS92380 and LT3743 require a separate enable signal in addition to PWM control. Add this property to allow device trees to specify such GPIO, which will be controlled automatically by the driver based on the LED brightness state. Reviewed-by: Krzysztof Kozlowski Signed-off-by: LI Qingwu --- Documentation/devicetree/bindings/leds/leds-pwm.yaml | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/devicetree/bindings/leds/leds-pwm.yaml b/Documen= tation/devicetree/bindings/leds/leds-pwm.yaml index 61b97e8bc36d0..6c4fcefbe25f9 100644 --- a/Documentation/devicetree/bindings/leds/leds-pwm.yaml +++ b/Documentation/devicetree/bindings/leds/leds-pwm.yaml @@ -40,6 +40,13 @@ patternProperties: initialization. If the option is not set then max brightness is = used. $ref: /schemas/types.yaml#/definitions/uint32 =20 + enable-gpios: + description: + GPIO for LED hardware enable control. 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Thu, 24 Jul 2025 08:02:32 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 193.8.40.94) smtp.mailfrom=leica-geosystems.com.cn; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=leica-geosystems.com.cn; Received-SPF: Pass (protection.outlook.com: domain of leica-geosystems.com.cn designates 193.8.40.94 as permitted sender) receiver=protection.outlook.com; client-ip=193.8.40.94; helo=hexagon.com; pr=C Received: from hexagon.com (193.8.40.94) by AM2PEPF0001C70E.mail.protection.outlook.com (10.167.16.202) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8964.20 via Frontend Transport; Thu, 24 Jul 2025 08:02:32 +0000 Received: from GEO-W5CG2253GWB.lgs-net.com ([10.132.33.42]) by hexagon.com with Microsoft SMTPSVC(10.0.17763.1697); Thu, 24 Jul 2025 10:02:31 +0200 From: LI Qingwu To: lee@kernel.org, pavel@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Qing-wu.Li@leica-geosystems.com.cn Subject: [PATCH V8 2/2] leds: pwm: Add optional GPIO enable pin support Date: Thu, 24 Jul 2025 16:02:21 +0800 Message-ID: <20250724080221.7562-3-Qing-wu.Li@leica-geosystems.com.cn> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250724080221.7562-1-Qing-wu.Li@leica-geosystems.com.cn> References: <20250724080221.7562-1-Qing-wu.Li@leica-geosystems.com.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-OriginalArrivalTime: 24 Jul 2025 08:02:31.0691 (UTC) FILETIME=[4E8CB5B0:01DBFC71] X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM2PEPF0001C70E:EE_|VI1PR06MB6479:EE_ X-MS-Office365-Filtering-Correlation-Id: fd495326-da11-45a5-54b5-08ddca887156 X-SET-LOWER-SCL-SCANNER: YES X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|36860700013|82310400026|1800799024; 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X-OriginatorOrg: leica-geosystems.com.cn X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jul 2025 08:02:32.1372 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fd495326-da11-45a5-54b5-08ddca887156 X-MS-Exchange-CrossTenant-Id: 1b16ab3e-b8f6-4fe3-9f3e-2db7fe549f6a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=1b16ab3e-b8f6-4fe3-9f3e-2db7fe549f6a;Ip=[193.8.40.94];Helo=[hexagon.com] X-MS-Exchange-CrossTenant-AuthSource: AM2PEPF0001C70E.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR06MB6479 Content-Type: text/plain; charset="utf-8" Add support for optional GPIO-based enable pin control to PWM LED driver. Some PWM LED driver chips like TPS92380 and LT3743 require a separate enable signal in addition to PWM control. Implement support for such GPIO control through the "enable-gpios" device tree property, activating the pin when LED brightness is non-zero and deactivating it when off. Tested on i.MX8MP EVK with TPS92380 LED driver chip Signed-off-by: LI Qingwu --- drivers/leds/leds-pwm.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c index c73134e7b9514..08a1f735166ad 100644 --- a/drivers/leds/leds-pwm.c +++ b/drivers/leds/leds-pwm.c @@ -17,6 +17,7 @@ #include #include #include +#include =20 struct led_pwm { const char *name; @@ -29,6 +30,7 @@ struct led_pwm_data { struct led_classdev cdev; struct pwm_device *pwm; struct pwm_state pwmstate; + struct gpio_desc *enable_gpio; unsigned int active_low; }; =20 @@ -51,6 +53,8 @@ static int led_pwm_set(struct led_classdev *led_cdev, if (led_dat->active_low) duty =3D led_dat->pwmstate.period - duty; =20 + gpiod_set_value_cansleep(led_dat->enable_gpio, brightness =3D=3D LED_OFF = ? 0 : 1); + led_dat->pwmstate.duty_cycle =3D duty; /* * Disabling a PWM doesn't guarantee that it emits the inactive level. @@ -132,6 +136,22 @@ static int led_pwm_add(struct device *dev, struct led_= pwm_priv *priv, break; } =20 + /* + * Claim the GPIO as GPIOD_ASIS and set the value + * later on to honor the different default states + */ + led_data->enable_gpio =3D devm_fwnode_gpiod_get(dev, fwnode, "enable", GP= IOD_ASIS, NULL); + + if (IS_ERR(led_data->enable_gpio)) { + if (PTR_ERR(led_data->enable_gpio) =3D=3D -ENOENT) + /* Enable GPIO is optional */ + led_data->enable_gpio =3D NULL; + else + return PTR_ERR(led_data->enable_gpio); + } + + gpiod_direction_output(led_data->enable_gpio, !!led_data->cdev.brightness= ); + ret =3D devm_led_classdev_register_ext(dev, &led_data->cdev, &init_data); if (ret) { dev_err(dev, "failed to register PWM led for %s: %d\n", --=20 2.43.0