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authorFaiz Abbas <faiz_abbas@ti.com>2019-06-20 15:07:21 +0530
committerTom Rini <trini@konsulko.com>2019-07-26 22:24:11 -0400
commit6b66d2ee47e28babb6fbca3206abda6d10961b36 (patch)
tree9cb8a4967d49faadbc12c6849468c3127d174c68 /arch/arm/dts/am571x-idk.dts
parent684af0be943c11933e784566b4558d98681b5216 (diff)
ARM: dts: am57xx: Disable voltage switching for SD card
If UHS speed modes are enabled, a compatible SD card switches down to 1.8V during enumeration. If after this a software reboot/crash takes place and on-chip ROM tries to enumerate the SD card, the difference in IO voltages (host @ 3.3V and card @ 1.8V) may end up damaging the card. The fix for this is to have support for power cycling the card in hardware (with a PORz/soft-reset line causing a power cycle of the card). Because the beaglebone X15 (rev A,B and C), am57xx-evms and am57xx-idks don't have this capability, disable voltage switching for these boards. The major effect of this is that the maximum supported speed mode is now high speed(50 MHz) down from SDR104(200 MHz). Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Diffstat (limited to 'arch/arm/dts/am571x-idk.dts')
-rw-r--r--arch/arm/dts/am571x-idk.dts7
1 files changed, 1 insertions, 6 deletions
diff --git a/arch/arm/dts/am571x-idk.dts b/arch/arm/dts/am571x-idk.dts
index eb5fda81f5..798fbfe19d 100644
--- a/arch/arm/dts/am571x-idk.dts
+++ b/arch/arm/dts/am571x-idk.dts
@@ -102,14 +102,9 @@
};
&mmc1 {
- pinctrl-names = "default", "hs", "sdr12", "sdr25", "sdr50", "ddr50", "sdr104";
+ pinctrl-names = "default", "hs";
pinctrl-0 = <&mmc1_pins_default_no_clk_pu>;
pinctrl-1 = <&mmc1_pins_hs>;
- pinctrl-2 = <&mmc1_pins_sdr12>;
- pinctrl-3 = <&mmc1_pins_sdr25>;
- pinctrl-4 = <&mmc1_pins_sdr50>;
- pinctrl-5 = <&mmc1_pins_ddr50_rev20 &mmc1_iodelay_ddr50_conf>;
- pinctrl-6 = <&mmc1_pins_sdr104 &mmc1_iodelay_sdr104_rev20_conf>;
};
&mmc2 {