This patch allows a new kind of compatible string for LPDDR parts in the
device tree bindings, in addition to the existing hardcoded
<vendor>,<part-number> strings. The new format contains manufacturer and
part (revision) information in numerical form, such as lpddr3-ff,0201
for an LPDDR3 part with manufacturer ID ff and revision ID 0201. This
helps cases where LPDDR parts are probed at runtime by boot firmware and
cannot be matched to hardcoded part numbers, such as the firmware on the
qcom/sc7280-herobrine boards does (which supports 4 different memory
configurations at the moment, and more are expected to be added later at
a point where the boot firmware can no longer be updated to specifically
accommodate them).
Signed-off-by: Julius Werner <jwerner@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220930220606.303395-2-jwerner@chromium.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
The bindings for different LPDDR versions mostly use the same kinds of
properties, so in order to reduce duplication when we're adding support
for more versions, this patch creates a new lpddr-props subschema that
can be referenced by the others to define these common parts. (This will
consider a few smaller I/O width and density numbers "legal" for LPDDR3
that are usually not used there, but this should be harmless.)
Signed-off-by: Julius Werner <jwerner@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220930220606.303395-1-jwerner@chromium.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Krzysztof Kozlowski's @canonical.com email stopped working, so switch to
generic @kernel.org account for all Devicetree bindings.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20220330074016.12896-2-krzysztof.kozlowski@linaro.org
Commit 3539a2c6c6 ("dt-bindings: memory: lpddr2: Add revision-id
properties") added the properties `revision-id1` and `revision-id2` to
the "jedec,lpddr2" binding. The "jedec,lpddr3" binding already had a
single array property `revision-id` for the same purpose. For
consistency between related memory types, this patch deprecates the
LPDDR2 properties and instead adds a property in the same style as for
LPDDR3 to that binding.
Signed-off-by: Julius Werner <jwerner@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220224003421.3440124-2-jwerner@chromium.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Elpida B8132B2PB-6D-F memory chip is used by ASUS Transformer TF101
tablet, add compatible for it. We need to specify this compatible it
for a device-tree node containing corresponding memory timings in order
to allow software to match the timings with the detected hardware.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211006224659.21434-5-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Add optional revision-id standard LPDDR2 properties which will help to
identify memory chip.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211006224659.21434-4-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Convert LPDDR2 binding to schema. I removed obsolete ti,jedec-lpddr2-*
compatibles since they were never used by device-trees and by the code.
I also changed "Elpida" compatible prefix to lowercase "elpida".
Suggested-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211006224659.21434-3-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
