diff options
| author | Stefan Agner <stefan.agner@toradex.com> | 2017-06-08 13:44:17 -0700 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2017-06-17 17:19:09 +0200 |
| commit | 3ca407c4f1edfcdf8cdba81bd82b1ab2e9b406a7 (patch) | |
| tree | 369170952ff1156276ed836ff5a9c0f00dbe3134 /arch | |
| parent | 46713ddc870f77064b5a05f522fc7e1fdb635fc7 (diff) | |
ARM: dts: imx7-colibri: assign LDO2 to USDHC2 by default
The USDHC instance 1 is powered with a separate rail. This
allows to switch voltage of the SD card signals for higher
speed modes such as UHS-I. The reset state of that rail is
enabled and 3.3V.
Revision before Colibri iMX7S V1.1C and iMX7D V1.1D had
that rail connected to +3.3V rail switchable with a PMIC
GPIO which turned out to be not controllable in regular
run mode and to LDO2.
Colibri iMX7S V1.1C and iMX7D V1.1D and later connect it
to the PMIC LDO2 only, which allows to control the voltage
directly.
This change explicitly assigning the PMIC regulator which
allows the SDHC driver code to control the SD card voltage
and hence negotiate higher speeds for SD cards capable of
UHS-I or later. Note that the carrier board device tree
needs to be adjusted too (see comments at the usdhc1 node)
and the carrier board should have no pull-ups populated.
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/boot/dts/imx7-colibri.dtsi | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/arm/boot/dts/imx7-colibri.dtsi b/arch/arm/boot/dts/imx7-colibri.dtsi index ab5067f91764..0d0a31e74784 100644 --- a/arch/arm/boot/dts/imx7-colibri.dtsi +++ b/arch/arm/boot/dts/imx7-colibri.dtsi @@ -212,7 +212,6 @@ regulator-min-microvolt = <1800000>; regulator-max-microvolt = <3300000>; regulator-boot-on; - regulator-always-on; }; reg_LDO3: LDO3 { /* PWR_EN_+V3.3_LPSR */ @@ -753,3 +752,7 @@ &usbotg1 { dr_mode = "otg"; }; + +&usdhc1 { + vmmc-supply = <®_LDO2>; +}; |