hi there,
I am trying to modify the i.mx28 dts file to use ssp2 for connecting to a broadcom wifi chip soldering on the same board as it. From peeping at other config files posted I
I currently have:
ssp2: ssp@80014000 {
compatible = "fsl,imx28-mmc";
pinctrl-names = "default";
pinctrl-0 = <&mmc2_4bit_pins_a &mmc2_cd_cfg &mmc2_sck_cfg>;
bus-width = <4>;
non-removable;
vmmc-supply = <®_vddio_sd2>;
status = "okay";
};
with the mmc2 definitions as:
mmc2_4bit_pins_a: mmc2-4bit@0 {
reg = <0>;
fsl,pinmux-ids = <
MX28_PAD_SSP0_DATA4__SSP2_D0
MX28_PAD_SSP1_SCK__SSP2_D1
MX28_PAD_SSP1_CMD__SSP2_D2
MX28_PAD_SSP0_DATA5__SSP2_D3
MX28_PAD_SSP0_DATA6__SSP2_CMD
MX28_PAD_SSP0_DATA7__SSP2_SCK
>;
fsl,drive-strength = <MXS_DRIVE_8mA>;
fsl,voltage = <MXS_VOLTAGE_HIGH>;
fsl,pull-up = <MXS_PULL_ENABLE>;
};
mmc2_cd_cfg: mmc2-cd-cfg {
fsl,pinmux-ids = <
MX28_PAD_AUART1_RX__SSP2_CARD_DETECT
>;
fsl,pull-up = <MXS_PULL_DISABLE>;
};
mmc2_sck_cfg: mmc2-sck-cfg {
fsl,pinmux-ids = <
MX28_PAD_SSP0_DATA7__SSP2_SCK
>;
fsl,drive-strength = <MXS_DRIVE_12mA>;
fsl,pull-up = <MXS_PULL_DISABLE>;
};
under regulators, I have:
reg_vddio_sd2: vddio-sd2 {
compatible = "regulator-fixed";
regulator-name = "vddio-sd2";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
gpio = <&gpio2 14 0>;
startup-delay-us = <70000>;
enable-active-high;
};
which controls the wifi chip enable.
which I believe matches up to what I have on the board.
On ssp0, I have an sd card to boot the kernel image. With SSP2 configured as such, the system gets a kernel panic, it seems to be confused about mmc0 versus mmc2:
.073406] VFS: Cannot open root device "mmcblk0p3" or unknown-block(179,3): error -30
[ 2.081616] Please append a correct "root=" boot option; here are the available partitions:
[ 2.090040] b300 7782400 mmcblk0 driver: mmcblk
[ 2.095570] b301 1024 mmcblk0p1 00000000-01
[ 2.100936] b302 2048 mmcblk0p2 00000000-02
[ 2.106441] b303 7778304 mmcblk0p3 00000000-03
Without SSP2 configured, the system boots from SSP0 fine. Perhaps I need to change my uboot options.
Any thoughts on how to proceed?
thanks!
-Tyler
