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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/device-tree-bindings/chosen.txt | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/chosen.txt b/doc/device-tree-bindings/chosen.txt index 86c533ad6d..395c9501e3 100644 --- a/doc/device-tree-bindings/chosen.txt +++ b/doc/device-tree-bindings/chosen.txt @@ -42,6 +42,36 @@ Example }; }; +u-boot,bootcount-device property +-------------------------------- + +In a DM-based system, the bootcount may be stored in a device known to +the DM framework (e.g. in a battery-backed SRAM area within a RTC +device) managed by a device conforming to UCLASS_BOOTCOUNT. If +multiple such devices are present in a system concurrently, then the +u-boot,bootcount-device property can select the preferred target. + +Example +------- +/ { + chosen { + u-boot,bootcount-device = &bootcount-rv3029; + }; + + bootcount-rv3029: bootcount@0 { + compatible = "u-boot,bootcount-rtc"; + rtc = &rv3029; + offset = <0x38>; + }; + + i2c2 { + rv3029: rtc@56 { + compatible = "mc,rv3029"; + reg = <0x56>; + }; + }; +}; + u-boot,spl-boot-order property ------------------------------ |