diff mbox series

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

Message ID 20210713202108.449831-1-oleksandr.suvorov@toradex.com (mailing list archive)
State New, archived
Headers show
Series [v2] ARM: dts: colibri-imx6ull: limit SDIO clock to 25MHz | expand

Commit Message

Oleksandr Suvorov July 13, 2021, 8:21 p.m. UTC 
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.

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

Comments

Shawn Guo July 23, 2021, 2:56 a.m. UTC | #1 
On Tue, Jul 13, 2021 at 11:21:07PM +0300, Oleksandr Suvorov wrote:
> 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.
> 
> Fixes: c2e4987e0e02 ("ARM: dts: imx6ull: add Toradex Colibri iMX6ULL support")
> Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
> Reviewed-by: Fabio Estevam <festevam@gmail.com>

Applied, thanks!
diff mbox series

Patch

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;