leandrof/u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

rockchip: rk3399-puma: add boot-on regulator to override BIOS_DISABLE

Browse Source 
The (Qseven) BIOS_DISABLE signal on the RK3399-Q7 (Puma) keeps the
eMMC and SPI in reset initially and we need to write a GPIO to turn
them on before continuing the boot-up.

This adds the DTS entries for the additional regulator and makes
pinctrl and gpio3 available during SPL.  It also adds a hook to the
spl_board_init() to ensure that the regulator gets probed and enabled.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Philipp Tomsich 2017-09-29 19:28:01 +02:00
parent 0b5e7aab0e
commit 482cf22333
2 changed files with 36 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
arch/arm/dts/rk3399-puma.dtsi
View File

@ -101,6 +101,24 @@
regulator-max-microvolt = <3300000>;
};
/*
* The Qseven BIOS_DISABLE signal on the RK3399-Q7 keeps the on-module
* eMMC and SPI flash powered-down initially (in fact it keeps the
* reset signal asserted). Even though it is an enable signal, we
* model this as a regulator.
*/
bios_enable: bios_enable {
compatible = "regulator-fixed";
u-boot,dm-pre-reloc;
regulator-name = "bios_enable";
enable-active-low;
gpio = <&gpio3 29 GPIO_ACTIVE_HIGH>;
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
};
vccadc_ref: vccadc-ref {
compatible = "regulator-fixed";
regulator-name = "vcc1v8_sys";
@ -533,10 +551,15 @@
status = "okay";
};
&gpio3 {
u-boot,dm-pre-reloc;
};
&pinctrl {
/* Pins that are not explicitely used by any devices */
pinctrl-names = "default";
pinctrl-0 = <&puma_pin_hog>;
hog {
puma_pin_hog: puma_pin_hog {
rockchip,pins =
@ -652,4 +675,3 @@
&spi5 {
status = "okay";
};

10
board/theobroma-systems/puma_rk3399/puma-rk3399.c
View File

@ -34,6 +34,16 @@ int board_init(void)
void spl_board_init(void)
{
int ret;
/*
* Turning the eMMC and SPI back on (if disabled via the Qseven
* BIOS_ENABLE) signal is done through a always-on regulator).
*/
ret = regulators_enable_boot_on(false);
if (ret)
debug("%s: Cannot enable boot on regulator\n", __func__);
preloader_console_init();
}