On Wed, Sep 25, 2024 at 11:45:25PM +0200, Christian Marangi wrote: > Document support for defining a partition table in the mmc-card node. > > This is needed if the eMMC doesn't have a partition table written and > the bootloader of the device load data by using absolute offset of the > block device. This is common on embedded device that have eMMC installed > to save space and have non removable block devices. > > If an OF partition table is detected, any partition table written in the > eMMC will be ignored and won't be parsed. > > eMMC provide a generic disk for user data and if supported (JEDEC 4.4+) > also provide two additional disk ("boot0" and "boot1") for special usage > of boot operation where normally is stored the bootloader or boot info. > > Signed-off-by: Christian Marangi <ansuelsmth@xxxxxxxxx> > --- > .../devicetree/bindings/mmc/mmc-card.yaml | 57 +++++++++++++++++++ > 1 file changed, 57 insertions(+) > > diff --git a/Documentation/devicetree/bindings/mmc/mmc-card.yaml b/Documentation/devicetree/bindings/mmc/mmc-card.yaml > index fd347126449a..58b6593a0f60 100644 > --- a/Documentation/devicetree/bindings/mmc/mmc-card.yaml > +++ b/Documentation/devicetree/bindings/mmc/mmc-card.yaml > @@ -13,6 +13,10 @@ description: | > This documents describes the devicetree bindings for a mmc-host controller > child node describing a mmc-card / an eMMC. > > + It's possible to define a fixed partition table for an eMMC for the user > + partition and one of the 2 boot partition (boot0/boot1) if supported by the > + eMMC. > + > properties: > compatible: > const: mmc-card > @@ -26,6 +30,30 @@ properties: > Use this to indicate that the mmc-card has a broken hpi > implementation, and that hpi should not be used. > > + "#address-cells": > + const: 0 > + > + "#size-cells": > + const: 0 Don't need these properties. > + > +patternProperties: > + "^partitions(-boot[01])?$": > + $ref: /schemas/block/partitions/partitions.yaml > + > + patternProperties: > + "^partition@[0-9a-f]+$": > + $ref: /schemas/block/partitions/partition.yaml > + > + properties: > + reg: > + multipleOf: 512 I was going to suggest this, but I think it won't actually work because it could be 2 cells for address and/or size. Rob