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dt-bindings: ddr: Add optional manufacturer and revision ID to LPDDR3

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On some platforms, DDR parts are multi-sourced and the exact part number
used is not know to either kernel or firmware at build time. Firmware
can read identifying information from DDR mode registers at boot time
but needs a way to communicate this information to kernel and/or
userspace. This patch adds optional properties for this information to
the existing "jedec,lpddr3" device tree binding to be used for that
purpose.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Link: https://lore.kernel.org/r/20210324010405.1917577-1-jwerner@chromium.org
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Julius Werner 2021-03-23 18:04:05 -07:00 committed by Rob Herring
parent 8657375165
commit b368d9e7c9
1 changed files with 5 additions and 0 deletions
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5
Documentation/devicetree/bindings/ddr/lpddr3.txt
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@ -12,6 +12,9 @@ Required properties:
Optional properties:
- manufacturer-id : <u32> Manufacturer ID value read from Mode Register 5
- revision-id : <u32 u32> Revision IDs read from Mode Registers 6 and 7
The following optional properties represent the minimum value of some AC
timing parameters of the DDR device in terms of number of clock cycles.
These values shall be obtained from the device data-sheet.
@ -49,6 +52,8 @@ samsung_K3QF2F20DB: lpddr3 {
compatible = "samsung,K3QF2F20DB", "jedec,lpddr3";
density = <16384>;
io-width = <32>;
manufacturer-id = <1>;
revision-id = <123 234>;
#address-cells = <1>;
#size-cells = <0>;