* [PATCH v2] ARM: dts: colibri-imx6ull: limit SDIO clock to 25MHz
@ 2021-07-13 20:21 Oleksandr Suvorov
2021-07-23 2:56 ` Shawn Guo
0 siblings, 1 reply; 2+ messages in thread
From: Oleksandr Suvorov @ 2021-07-13 20:21 UTC (permalink / raw)
To: linux-next
Cc: Oleksandr Suvorov, Fabio Estevam, NXP Linux Team,
Pengutronix Kernel Team, Rob Herring, Sascha Hauer, Shawn Guo,
Stefan Agner, devicetree, linux-arm-kernel, linux-kernel
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(+)
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] ARM: dts: colibri-imx6ull: limit SDIO clock to 25MHz
2021-07-13 20:21 [PATCH v2] ARM: dts: colibri-imx6ull: limit SDIO clock to 25MHz Oleksandr Suvorov
@ 2021-07-23 2:56 ` Shawn Guo
0 siblings, 0 replies; 2+ messages in thread
From: Shawn Guo @ 2021-07-23 2:56 UTC (permalink / raw)
To: Oleksandr Suvorov
Cc: linux-next, Fabio Estevam, NXP Linux Team,
Pengutronix Kernel Team, Rob Herring, Sascha Hauer, Stefan Agner,
devicetree, linux-arm-kernel, linux-kernel
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!
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2021-07-23 2:56 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-07-13 20:21 [PATCH v2] ARM: dts: colibri-imx6ull: limit SDIO clock to 25MHz Oleksandr Suvorov
2021-07-23 2:56 ` Shawn Guo
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).