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arm64: dts: zcu100-revC: Give wifi some time after power-on

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Somewhere along recent changes to power control of the wl1831, power-on
became very unreliable on the Ultra96, failing like this:

wl1271_sdio: probe of mmc2:0001:1 failed with error -16
wl1271_sdio: probe of mmc2:0001:2 failed with error -16

After playing with some dt parameters and comparing to other users of
this chip, it turned out we need some power-on delay to make things
stable again. In contrast to those other users which define 200 ms,
Ultra96 is already happy with 10 ms.

Fixes: 5869ba0653b9 ("arm64: zynqmp: Add support for Xilinx zcu100-revC")
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Jan Kiszka 2019-01-24 09:28:59 +01:00 committed by Michal Simek
parent 096d7f5b3e
commit 85eeaae3cc
1 changed files with 1 additions and 0 deletions
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arch/arm/dts/zynqmp-zcu100-revC.dts
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@ -123,6 +123,7 @@
sdio_pwrseq: sdio-pwrseq {
compatible = "mmc-pwrseq-simple";
reset-gpios = <&gpio 7 GPIO_ACTIVE_LOW>; /* WIFI_EN */
post-power-on-delay-ms = <10>;
};
ina226 {