tegra20-emc: Identify memory chip by LPDDR configuration

Support memory chip identification by LPDDR2 configuration, which is needed by ASUS Transformer TF101 tablet device that doesn't store RAMCODE in Tegra's NVMEM.

Changelog:

v5: - Added new patch which adds vendor prefix for Elpida Inc.

- Added new patch that updates existing device-tree to use proper lowercase "elpida," compatible prefix.

- Changed Krzysztof's email address in the LPDDR2 binding.

- Added uint32 types to the LPDDR2 binding, which was requested by Krzysztof Kozlowski.

v4: - Moved DDR bindings directory to memory-controllers/, like it
was suggested by Krzysztof Kozlowski.

- Converted existing LPDDR2 binding to schema and utilized it, like it was requested by Krzysztof Kozlowski.

- Added Elpida B8132B2PB-6D-F compatible.

- Made code changes that were requested by Krzysztof Kozlowski.

v3: - Corrected sub-node name in tegra20-emc.yaml.

v2: - Added separate binding for standard LPDDR2 properties, like it
was suggested by Krzysztof Kozlowski.

- Switched Tegra binding to use new lpddr2-configuration sub-node that contains the standard properties.

- Extended commit message of the "emc: Document new LPDDR2 sub-node" patch, telling how the properties are supposed to be used, which was requested by Krzysztof Kozlowski.

- Added new common helpers for parsing LPDDR2 properties and made tegra20-emc driver to use these helpers.

Dmitry Osipenko (9):
dt-bindings: Relocate DDR bindings
dt-bindings: memory: lpddr2: Convert to schema
dt-bindings: memory: lpddr2: Add revision-id properties
dt-bindings: memory: lpddr2: Document Elpida B8132B2PB-6D-F
dt-bindings: Add vendor prefix for Elpida Memory
ARM: dts: elpida_ecb240abacn: Change Elpida compatible
dt-bindings: memory: tegra20: emc: Document new LPDDR2 sub-node
memory: Add LPDDR2-info helpers
memory: tegra20-emc: Support matching timings by LPDDR2 configuration

 .../devicetree/bindings/ddr/lpddr2.txt        | 102 --------
 .../memory-controllers/ddr/jedec,lpddr2.yaml  | 223 ++++++++++++++++++
 .../ddr/lpddr2-timings.txt                    |   0
 .../ddr/lpddr3-timings.txt                    |   0
 .../{ => memory-controllers}/ddr/lpddr3.txt   |   0
 .../nvidia,tegra20-emc.yaml                   |  23 +-
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 arch/arm/boot/dts/elpida_ecb240abacn.dtsi     |   2 +-
 drivers/memory/jedec_ddr.h                    |  47 ++++
 drivers/memory/jedec_ddr_data.c               |  41 ++++
 drivers/memory/of_memory.c                    |  87 +++++++
 drivers/memory/of_memory.h                    |   9 +
 drivers/memory/tegra/Kconfig                  |   1 +
 drivers/memory/tegra/tegra20-emc.c            | 199 ++++++++++++++--
 14 files changed, 617 insertions(+), 119 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/ddr/lpddr2.txt
 create mode 100644 Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml
 rename Documentation/devicetree/bindings/{ => memory-controllers}/ddr/lpddr2-timings.txt (100%)
 rename Documentation/devicetree/bindings/{ => memory-controllers}/ddr/lpddr3-timings.txt (100%)
 rename Documentation/devicetree/bindings/{ => memory-controllers}/ddr/lpddr3.txt (100%)

2.32.0