Commit c7cc9ba1 authored by Lokesh Vutla's avatar Lokesh Vutla Committed by Tony Lindgren

ARM: dts: dra7-evm: Add vtt regulator support

DRA7 evm REV G and later boards uses a vtt regulator for DDR3
termination and this is controlled by gpio7_11. This gpio is
configured in boot loader. gpio7_11, which is only available only on
Pad A22, in previous boards, is connected only to an unused pad on
expansion connector EXP_P3 and is safe to be muxed as GPIO on all
DRA7-evm versions (without a need to spin off another dts file).

Since gpio7_11 is used to control VTT and should not be reset or kept
in idle state during boot up else VTT will be disconnected and DDR
gets corrupted. So, as part of this change, mark gpio7 as no-reset and
no-idle on init.
Signed-off-by: default avatarLokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: default avatarNishanth Menon <nm@ti.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 68e4d9e5
......@@ -8,6 +8,7 @@
/dts-v1/;
#include "dra74x.dtsi"
#include <dt-bindings/gpio/gpio.h>
/ {
model = "TI DRA742";
......@@ -24,9 +25,29 @@ mmc2_3v3: fixedregulator-mmc2 {
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
};
vtt_fixed: fixedregulator-vtt {
compatible = "regulator-fixed";
regulator-name = "vtt_fixed";
regulator-min-microvolt = <1350000>;
regulator-max-microvolt = <1350000>;
regulator-always-on;
regulator-boot-on;
enable-active-high;
gpio = <&gpio7 11 GPIO_ACTIVE_HIGH>;
};
};
&dra7_pmx_core {
pinctrl-names = "default";
pinctrl-0 = <&vtt_pin>;
vtt_pin: pinmux_vtt_pin {
pinctrl-single,pins = <
0x3b4 (PIN_OUTPUT | MUX_MODE14) /* spi1_cs1.gpio7_11 */
>;
};
i2c1_pins: pinmux_i2c1_pins {
pinctrl-single,pins = <
0x400 (PIN_INPUT | MUX_MODE0) /* i2c1_sda */
......@@ -54,7 +75,6 @@ mcspi1_pins: pinmux_mcspi1_pins {
0x3a8 (PIN_INPUT | MUX_MODE0) /* spi1_d1 */
0x3ac (PIN_INPUT | MUX_MODE0) /* spi1_d0 */
0x3b0 (PIN_INPUT_SLEW | MUX_MODE0) /* spi1_cs0 */
0x3b4 (PIN_INPUT_SLEW | MUX_MODE0) /* spi1_cs1 */
0x3b8 (PIN_INPUT_SLEW | MUX_MODE6) /* spi1_cs2.hdmi1_hpd */
0x3bc (PIN_INPUT_SLEW | MUX_MODE6) /* spi1_cs3.hdmi1_cec */
>;
......@@ -504,3 +524,8 @@ &usb2_phy1 {
&usb2_phy2 {
phy-supply = <&ldousb_reg>;
};
&gpio7 {
ti,no-reset-on-init;
ti,no-idle-on-init;
};
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment