Re: [PATCH 0/2] ARM: dts: Use MMC pwrseq instead regulators for IGEP WiFi init

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hello Tony,

On 12/03/2015 03:16 PM, Tony Lindgren wrote:
> * Javier Martinez Canillas <javier@xxxxxxxxxxxxxxx> [151203 10:03]:
>> Hello,
>>
>> This series converts the IGEPv2 (IGEP0020) and IGEP COM Module (IGEP0030)
>> Device Tree to use the MMC power sequence provider to initialize the SDIO
>> WiFi chip instead of using fake fixed regulators to just toggle the Reset
>> and Power pins in the chip.
>>
>> The patches were tested on an DM3730 IGEPv2 board but the IGEP COM Module
>> is the same with regard to the SDIO WiFi so it should be safe to land too.
>>
>> The IGEPv2 Rev.F and the IGEP COM Module Rev.G DTS were not converted due
>> using a different WiFi chip (wlcore instead of libertas) than the one in
>> the board I've access to test so I preferred to leave those untouched.
> 
> Do you have some solution for the start-up latency issue?
>

No, I don't and that's one of the reasons why I didn't want to touch the
DTS that have the wlcore chip.

The omap3-igep0020-rev-f.dts and omap3-igep0030-rev-g.dts don't have a
startup-delay-us property in the regulator for the WLAN_EN pin as is
the case for the IGEPv5 DTS but I don't know if those DTS are just wrong.

The DTS for the igep0020 and igep0030 that have the libertas chip,
did have a startup-delay-us for the WIFI_PDN but using the GPIOs
for RESET_N_W and WIFI_PDN in the mmc-pwrseq-simple reset-gpios is
enough to make the SDIO chip reset, be enumerated and WiFi to work
correctly so I don't know if that is really needed or is just a bad
description in the DTS.

Since is working for the boards with the libertas chip, I preferred
to remove the DTS hack but left the boards with wlcore chip since
you said the startup-delay-us is needed there (but probably we should
add to the regulators in the boards that don't have it then).

> Regards,
> 
> Tony
> 

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux