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.toms...@theobroma-systems.com>
---
arch/arm/dts/rk3399-puma.dtsi | 23 +++++++++++++++++++++++
board/theobroma-systems/puma_rk3399/puma-rk3399.c | 10 ++++++++++
2 files changed, 33 insertions(+)
diff --git a/arch/arm/dts/rk3399-puma.dtsi b/arch/arm/dts/rk3399-puma.dtsi
index edb9424..85e00ec 100644
--- a/arch/arm/dts/rk3399-puma.dtsi
+++ b/arch/arm/dts/rk3399-puma.dtsi
@@ -90,6 +90,24 @@
};
};
+ /*
+ * 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";
@@ -523,10 +541,15 @@
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 =
diff --git a/board/theobroma-systems/puma_rk3399/puma-rk3399.c
b/board/theobroma-systems/puma_rk3399/puma-rk3399.c
index cc572b5..b49fa66 100644
--- a/board/theobroma-systems/puma_rk3399/puma-rk3399.c
+++ b/board/theobroma-systems/puma_rk3399/puma-rk3399.c
@@ -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();
return;
}
--
2.1.4
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