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author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2020-09-28 16:45:14 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2020-09-29 10:25:02 +0200 |
commit | bc4ac257257c340b108499e65ed7ac383306b2b8 (patch) | |
tree | e22cc2563900f76e738afbc36f4927c5cad319f3 | |
parent | db4640e77e6f45532489663a045b0800c096cc57 (diff) | |
download | barebox-bc4ac257257c340b108499e65ed7ac383306b2b8.tar.gz barebox-bc4ac257257c340b108499e65ed7ac383306b2b8.tar.xz |
ARM: dts: i.MX6qdl: define BootROM reboot-mode on top of SRC_GPR{9, 10}
The SRC general purpose registers of the i.MX6 keep their values after a
warm reset and are used for communication between the BootROM and upper
level software.
SRC_GPR9 allows software override of SRC_SBMR1, e.g. to boot via
serial download protocol. Define a suitable syscon-reboot-mode
node to use it.
To have SRC_GPR9 take effect, bit 28 in SRC_GPR10 has to be set as well.
To support this, we use the backward-compatible barebox-specific binding
for having multiple 32-bit values for a single mode.
This node will _not_ be fixed up into the kernel device tree due to
the barebox-specific compatible, but as with all reboot mode storage,
the referenced locations will be cleared to the normal (here all-zero)
mode. User software that expects exclusive access to GPR9 while GPR10
bit 28 is zero will be broken.
Rebooting into serial download is now possible via:
barebox@board:/ gpr.reboot_mode.next=serial reset -r imxwd
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r-- | arch/arm/dts/imx6qdl.dtsi | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm/dts/imx6qdl.dtsi b/arch/arm/dts/imx6qdl.dtsi index 828be9ce0d..c3e02d2117 100644 --- a/arch/arm/dts/imx6qdl.dtsi +++ b/arch/arm/dts/imx6qdl.dtsi @@ -6,5 +6,26 @@ pwm2 = &pwm3; pwm3 = &pwm4; ipu0 = &ipu1; + gpr.reboot_mode = &reboot_mode_gpr; + }; +}; + +&src { + compatible = "fsl,imx6q-src", "fsl,imx51-src", "syscon", "simple-mfd"; + + reboot_mode_gpr: reboot-mode { + compatible = "barebox,syscon-reboot-mode"; + offset = <0x40>, <0x44>; /* SRC_GPR{9,10} */ + mask = <0xffffffff>, <0x10000000>; + mode-normal = <0>, <0>; + mode-serial = <0x00000010>, <0x10000000>; + mode-spi0-0 = <0x08000030>, <0x10000000>; + mode-spi0-1 = <0x18000030>, <0x10000000>; + mode-spi0-2 = <0x28000030>, <0x10000000>; + mode-spi0-3 = <0x38000030>, <0x10000000>; + mode-mmc0 = <0x00002040>, <0x10000000>; + mode-mmc1 = <0x00002840>, <0x10000000>; + mode-mmc2 = <0x00003040>, <0x10000000>; + mode-mmc3 = <0x00003840>, <0x10000000>; }; }; |