linux-kernel - [PATCH v2] ARM: dts: colibri-imx6ull: limit SDIO clock to 25MHz

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Message-Id: <20210713202108.449831-1-oleksandr.suvorov@toradex.com>
Date:   Tue, 13 Jul 2021 23:21:07 +0300
From:   Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
To:     linux-next@...r.kernel.org
Cc:     Oleksandr Suvorov <oleksandr.suvorov@...adex.com>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Stefan Agner <stefan@...er.ch>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] ARM: dts: colibri-imx6ull: limit SDIO clock to 25MHz

NXP and AzureWave don't recommend using SDIO bus mode 3.3V@...Hz 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.

Fixes: c2e4987e0e02 ("ARM: dts: imx6ull: add Toradex Colibri iMX6ULL support")
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
Reviewed-by: Fabio Estevam <festevam@...il.com>
---

Changes in v2:
- add Fixes field
- add Reviewed-by taken from Fabio
END

 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;
-- 
2.31.1