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Wed, 26 Feb 2025 17:06:55 +0000 Received: from CWLP123MB5473.GBRP123.PROD.OUTLOOK.COM ([fe80::c0fe:9ff5:51fd:3fdb]) by CWLP123MB5473.GBRP123.PROD.OUTLOOK.COM ([fe80::c0fe:9ff5:51fd:3fdb%5]) with mapi id 15.20.8489.019; Wed, 26 Feb 2025 17:06:55 +0000 From: Manuel Fombuena To: pavel@ucw.cz, lee@kernel.org, linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/3] leds: leds-st1202: initialize hardware before DT node child operations Date: Wed, 26 Feb 2025 17:06:40 +0000 Message-ID: X-Mailer: git-send-email 2.48.1 In-Reply-To: References: X-ClientProxiedBy: BLAPR03CA0159.namprd03.prod.outlook.com (2603:10b6:208:32f::34) To CWLP123MB5473.GBRP123.PROD.OUTLOOK.COM (2603:10a6:400:160::13) X-Microsoft-Original-Message-ID: <20250226170640.2338617-1-fombuena@outlook.com> Precedence: bulk X-Mailing-List: linux-leds@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CWLP123MB5473:EE_|CWLP123MB2803:EE_ X-MS-Office365-Filtering-Correlation-Id: db0c2ac8-d8b9-4bd4-278d-08dd5687f8cb X-Microsoft-Antispam: BCL:0; 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Specifically, resets the chip, enables its phase-shift delay feature, enables the device and disables all the LEDs channels. All that writing to registers, with no input from st1202_dt_init(). Real-world testing corroborates that calling st1202_setup() before st1202_dt_init() doesn't cause any issue during initialization. Switch the order of st1202_dt_init() and st1202_setup() to ensure the hardware is correctly initialized before the led_classdev struct is filled. Signed-off-by: Manuel Fombuena --- drivers/leds/leds-st1202.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/leds/leds-st1202.c b/drivers/leds/leds-st1202.c index 9f275f7fb159..e7dce8c26bde 100644 --- a/drivers/leds/leds-st1202.c +++ b/drivers/leds/leds-st1202.c @@ -349,11 +349,11 @@ static int st1202_probe(struct i2c_client *client) return ret; chip->client = client; - ret = st1202_dt_init(chip); + ret = st1202_setup(chip); if (ret < 0) return ret; - ret = st1202_setup(chip); + ret = st1202_dt_init(chip); if (ret < 0) return ret; From patchwork Wed Feb 26 17:12:50 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manuel Fombuena X-Patchwork-Id: 868767 Received: from LO2P265CU024.outbound.protection.outlook.com (mail-uksouthazolkn19011033.outbound.protection.outlook.com [52.103.37.33]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E9335258CFE; 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To reproduce this: - make menuconfig KCONFIG_CONFIG= - select LEDS_ST1202 dependencies OF, I2C and LEDS_CLASS. - select LEDS_ST1202 - LEDS_TRIGGERS is selected but LEDS_TRIGGER_PATTERN isn't. The absence of LEDS_TRIGGER_PATTERN explicitly required can lead to builds in which LEDS_ST1202 is selected while LEDS_TRIGGER_PATTERN isn't. The direct result of that would be that /sys/class/leds//hw_pattern wouldn't be available and there would be no way of interacting with the driver and hardware from user space. Add select LEDS_TRIGGER_PATTERN to Kconfig to meet the requirement and indirectly document it as well. Signed-off-by: Manuel Fombuena --- drivers/leds/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 2b27d043921c..8859e8fe292a 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -971,6 +971,7 @@ config LEDS_ST1202 depends on I2C depends on OF select LEDS_TRIGGERS + select LEDS_TRIGGER_PATTERN help Say Y to enable support for LEDs connected to LED1202 LED driver chips accessed via the I2C bus.