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dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=none action=none header.from=toradex.com; Received: from PAXPR05MB8285.eurprd05.prod.outlook.com (2603:10a6:102:dd::24) by PA4PR05MB7584.eurprd05.prod.outlook.com (2603:10a6:102:ff::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.26; Tue, 13 Jul 2021 19:54:45 +0000 Received: from PAXPR05MB8285.eurprd05.prod.outlook.com ([fe80::68c9:eb5c:2e08:f814]) by PAXPR05MB8285.eurprd05.prod.outlook.com ([fe80::68c9:eb5c:2e08:f814%7]) with mapi id 15.20.4308.027; Tue, 13 Jul 2021 19:54:45 +0000 From: Oleksandr Suvorov To: linux-next@vger.kernel.org Cc: Oleksandr Suvorov , Fabio Estevam , NXP Linux Team , Pengutronix Kernel Team , Rob Herring , Sascha Hauer , Shawn Guo , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] ARM: dts: colibri-imx6ull: limit SDIO clock to 25MHz Date: Tue, 13 Jul 2021 22:54:16 +0300 Message-Id: <20210713195416.277153-1-oleksandr.suvorov@toradex.com> X-Mailer: git-send-email 2.31.1 X-ClientProxiedBy: FR3P281CA0044.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:4a::7) To PAXPR05MB8285.eurprd05.prod.outlook.com (2603:10a6:102:dd::24) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from cryobook.toradex.int (82.193.109.226) by FR3P281CA0044.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:4a::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4331.12 via Frontend Transport; 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org NXP and AzureWave don't recommend using SDIO bus mode 3.3V@50MHz due to noise affecting the wireless throughput. Colibri iMX6ULL uses only 3.3V signaling for Wi-Fi module AW-CM276NF. Limit the SDIO Clock on Colibri iMX6ULL to 25MHz. Signed-off-by: Oleksandr Suvorov Reviewed-by: Fabio Estevam --- arch/arm/boot/dts/imx6ull-colibri-wifi.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/boot/dts/imx6ull-colibri-wifi.dtsi b/arch/arm/boot/dts/imx6ull-colibri-wifi.dtsi index a0545431b3dc..9f1e38282bee 100644 --- a/arch/arm/boot/dts/imx6ull-colibri-wifi.dtsi +++ b/arch/arm/boot/dts/imx6ull-colibri-wifi.dtsi @@ -43,6 +43,7 @@ &usdhc2 { assigned-clock-rates = <0>, <198000000>; cap-power-off-card; keep-power-in-suspend; + max-frequency = <25000000>; mmc-pwrseq = <&wifi_pwrseq>; no-1-8-v; non-removable;