Linux/WL1837MOD: probe of mmc2:0001:2 failed with error -12

Joshua Ostrander

Part Number: WL1837MOD
Other Parts Discussed in Thread: WL1271, WL1835

Tool/software: Linux

I am integrating a wilink8 wifi/BT adapter over SDIO with my imx6 platform. I'm using the drivers in the kernel and my kernel version is 4.1.15. When the sdio bus is brought up I see the driver probe happen but is always errors out with the -12 error code. as seen here:

/soc/aips-bus@02100000/usdhc@02198000: voltage-ranges unspecified
sdhci-esdhc-imx 2198000.usdhc: could not get ultra high speed state, work on normal mode
sdhci-esdhc-imx 2198000.usdhc: assigned as wifi host
sdhci-esdhc-imx 2198000.usdhc: No vmmc regulator found
sdhci-esdhc-imx 2198000.usdhc: No vqmmc regulator found
mmc2: SDHCI controller on 2198000.usdhc [2198000.usdhc] using ADMA
sdhci-esdhc-imx 2198000.usdhc: card claims to support voltages below defined range
mmc2: queuing unknown CIS tuple 0x91 (3 bytes)
mmc2: new high speed SDIO card at address 0001
wl1271_sdio: probe of mmc2:0001:1 failed with error -12

I have traced the cause of the error to the code in sdio.c below:

static int wlcore_probe_of(struct device *dev, int *irq,
                            struct wlcore_platdev_data *pdev_data)
{
         struct device_node *np = dev->of_node;
 
         if (!np || !of_match_node(wlcore_sdio_of_match_table, np))
                 return -ENODATA;

Unlike similar threads its not failing due to the match, it is failing because np is null.  Does anyone have any insight to why this would be?

Here is the relevant device tree entry:

&usdhc3 {
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_usdhc3_1>;
    wifi-host;
    /* no-1-8-v; */
    keep-power-in-suspend;
    enable-sdio-wakeup;
    status = "okay";
    
    wlcore: wlcore@0 {
        compatible = "ti,wl1837";
        interrupt-parent = <&gpio7>;
        interrupts = <9 IRQ_TYPE_LEVEL_HIGH>;
        status = "okay";
    };
};

over 8 years ago

0 S over 8 years ago

TI__Mastermind 35795 points

Joshua,
Did you consult imx patches for wilink ? . You may consult this link
processors.wiki.ti.com/.../WL18xx_System_Build_Scripts
patches should be in build-utilities/patches/kernel_patches/imx-3.14.28 . This won't be for the exact kernel version you are working on but you can use these patches as reference and check which ones apply to you

Thanks
Saurabh

0 Joshua Ostrander over 8 years ago in reply to S

Prodigy 30 points

Yes, I double checked and all those imx specific patches are already included in the 4.1.15 kernel source...

0 Eyal Reizer over 8 years ago in reply to Joshua Ostrander

TI__Mastermind 20285 points

Hi,

I think you are missing the "reg" definition in your .dts file
See example below:
+ wlcore: wlcore@2 {
+ compatible = "ti,wl1835";
+ reg = <2>;
+ interrupt-parent = <&gpio4>;
+ interrupts = <6 IRQ_TYPE_EDGE_RISING>;
+ };

BR,
Eyal

0 Joshua Ostrander over 8 years ago in reply to Eyal Reizer

Prodigy 30 points

Ah, you are correct! I didn't realize the reg line was required and I didn't realize it had to be 2 (denoting the Wi-Fi functionality). It is in the example entry in the devicetree kernel documentation, but I mistakenly thought that was only needed if you had multiple Wi-Fi devices. I missed the fact that it was for the multiple functions the Wilink 8 provides...

Thank you so much, that has finally unstuck me and I now have a chance at getting this device up and running this sprint!

Wi-Fi

Wi-Fi forum

Linux/WL1837MOD: probe of mmc2:0001:2 failed with error -12