[PATCH v4 2/7] dt-bindings: memory: lpddr2: Convert to schema
From: Dmitry Osipenko
Date: Tue Oct 05 2021 - 19:01:16 EST
Convert LPDDR2 binding to schema. I removed obsolete ti,jedec-lpddr2-*
compatibles since they were never used by device-trees and by the code.
Suggested-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
.../memory-controllers/ddr/jedec,lpddr2.yaml | 195 ++++++++++++++++++
.../memory-controllers/ddr/lpddr2.txt | 102 ---------
2 files changed, 195 insertions(+), 102 deletions(-)
create mode 100644 Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml
delete mode 100644 Documentation/devicetree/bindings/memory-controllers/ddr/lpddr2.txt
diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml
new file mode 100644
index 000000000000..d99ccad54938
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml
@@ -0,0 +1,195 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,lpddr2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LPDDR2 SDRAM compliant to JEDEC JESD209-2
+
+maintainers:
+ - Krzysztof Kozlowski <krzk@xxxxxxxxxx>
+
+properties:
+ compatible:
+ oneOf:
+ - items:
+ - enum:
+ - Elpida,ECB240ABACN
+ - enum:
+ - jedec,lpddr2-s4
+ - items:
+ - enum:
+ - jedec,lpddr2-s2
+ - items:
+ - enum:
+ - jedec,lpddr2-nvm
+
+ density:
+ description: |
+ Density in megabits of SDRAM chip. Obtained from device datasheet.
+ enum:
+ - 64
+ - 128
+ - 256
+ - 512
+ - 1024
+ - 2048
+ - 4096
+ - 8192
+ - 16384
+ - 32768
+
+ io-width:
+ description: |
+ IO bus width in bits of SDRAM chip. Obtained from device datasheet.
+ enum:
+ - 32
+ - 16
+ - 8
+
+ tRRD-min-tck:
+ maximum: 16
+ description: |
+ Active bank a to active bank b in terms of number of clock cycles.
+ Obtained from device datasheet.
+
+ tWTR-min-tck:
+ maximum: 16
+ description: |
+ Internal WRITE-to-READ command delay in terms of number of clock cycles.
+ Obtained from device datasheet.
+
+ tXP-min-tck:
+ maximum: 16
+ description: |
+ Exit power-down to next valid command delay in terms of number of clock
+ cycles. Obtained from device datasheet.
+
+ tRTP-min-tck:
+ maximum: 16
+ description: |
+ Internal READ to PRECHARGE command delay in terms of number of clock
+ cycles. Obtained from device datasheet.
+
+ tCKE-min-tck:
+ maximum: 16
+ description: |
+ CKE minimum pulse width (HIGH and LOW pulse width) in terms of number
+ of clock cycles. Obtained from device datasheet.
+
+ tRPab-min-tck:
+ maximum: 16
+ description: |
+ Row precharge time (all banks) in terms of number of clock cycles.
+ Obtained from device datasheet.
+
+ tRCD-min-tck:
+ maximum: 16
+ description: |
+ RAS-to-CAS delay in terms of number of clock cycles. Obtained from
+ device datasheet.
+
+ tWR-min-tck:
+ maximum: 16
+ description: |
+ WRITE recovery time in terms of number of clock cycles. Obtained from
+ device datasheet.
+
+ tRASmin-min-tck:
+ maximum: 16
+ description: |
+ Row active time in terms of number of clock cycles. Obtained from device
+ datasheet.
+
+ tCKESR-min-tck:
+ maximum: 16
+ description: |
+ CKE minimum pulse width during SELF REFRESH (low pulse width during
+ SELF REFRESH) in terms of number of clock cycles. Obtained from device
+ datasheet.
+
+ tFAW-min-tck:
+ maximum: 16
+ description: |
+ Four-bank activate window in terms of number of clock cycles. Obtained
+ from device datasheet.
+
+patternProperties:
+ "^lpddr2-timings":
+ type: object
+ description: |
+ The lpddr2 node may have one or more child nodes of type "lpddr2-timings".
+ "lpddr2-timings" provides AC timing parameters of the device for
+ a given speed-bin. The user may provide the timings for as many
+ speed-bins as is required. Please see Documentation/devicetree/
+ bindings/memory-controllers/ddr/lpddr2-timings.txt for more information
+ on "lpddr2-timings".
+
+required:
+ - compatible
+ - density
+ - io-width
+
+additionalProperties: false
+
+examples:
+ - |
+ elpida_ECB240ABACN: lpddr2 {
+ compatible = "Elpida,ECB240ABACN", "jedec,lpddr2-s4";
+ density = <2048>;
+ io-width = <32>;
+
+ tRPab-min-tck = <3>;
+ tRCD-min-tck = <3>;
+ tWR-min-tck = <3>;
+ tRASmin-min-tck = <3>;
+ tRRD-min-tck = <2>;
+ tWTR-min-tck = <2>;
+ tXP-min-tck = <2>;
+ tRTP-min-tck = <2>;
+ tCKE-min-tck = <3>;
+ tCKESR-min-tck = <3>;
+ tFAW-min-tck = <8>;
+
+ timings_elpida_ECB240ABACN_400mhz: lpddr2-timings0 {
+ compatible = "jedec,lpddr2-timings";
+ min-freq = <10000000>;
+ max-freq = <400000000>;
+ tRPab = <21000>;
+ tRCD = <18000>;
+ tWR = <15000>;
+ tRAS-min = <42000>;
+ tRRD = <10000>;
+ tWTR = <7500>;
+ tXP = <7500>;
+ tRTP = <7500>;
+ tCKESR = <15000>;
+ tDQSCK-max = <5500>;
+ tFAW = <50000>;
+ tZQCS = <90000>;
+ tZQCL = <360000>;
+ tZQinit = <1000000>;
+ tRAS-max-ns = <70000>;
+ };
+
+ timings_elpida_ECB240ABACN_200mhz: lpddr2-timings1 {
+ compatible = "jedec,lpddr2-timings";
+ min-freq = <10000000>;
+ max-freq = <200000000>;
+ tRPab = <21000>;
+ tRCD = <18000>;
+ tWR = <15000>;
+ tRAS-min = <42000>;
+ tRRD = <10000>;
+ tWTR = <10000>;
+ tXP = <7500>;
+ tRTP = <7500>;
+ tCKESR = <15000>;
+ tDQSCK-max = <5500>;
+ tFAW = <50000>;
+ tZQCS = <90000>;
+ tZQCL = <360000>;
+ tZQinit = <1000000>;
+ tRAS-max-ns = <70000>;
+ };
+ };
diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/lpddr2.txt b/Documentation/devicetree/bindings/memory-controllers/ddr/lpddr2.txt
deleted file mode 100644
index ddd40121e6f6..000000000000
--- a/Documentation/devicetree/bindings/memory-controllers/ddr/lpddr2.txt
+++ /dev/null
@@ -1,102 +0,0 @@
-* LPDDR2 SDRAM memories compliant to JEDEC JESD209-2
-
-Required properties:
-- compatible : Should be one of - "jedec,lpddr2-nvm", "jedec,lpddr2-s2",
- "jedec,lpddr2-s4"
-
- "ti,jedec-lpddr2-s2" should be listed if the memory part is LPDDR2-S2 type
-
- "ti,jedec-lpddr2-s4" should be listed if the memory part is LPDDR2-S4 type
-
- "ti,jedec-lpddr2-nvm" should be listed if the memory part is LPDDR2-NVM type
-
-- density : <u32> representing density in Mb (Mega bits)
-
-- io-width : <u32> representing bus width. Possible values are 8, 16, and 32
-
-Optional properties:
-
-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.
-- tRRD-min-tck
-- tWTR-min-tck
-- tXP-min-tck
-- tRTP-min-tck
-- tCKE-min-tck
-- tRPab-min-tck
-- tRCD-min-tck
-- tWR-min-tck
-- tRASmin-min-tck
-- tCKESR-min-tck
-- tFAW-min-tck
-
-Child nodes:
-- The lpddr2 node may have one or more child nodes of type "lpddr2-timings".
- "lpddr2-timings" provides AC timing parameters of the device for
- a given speed-bin. The user may provide the timings for as many
- speed-bins as is required. Please see Documentation/devicetree/
- bindings/ddr/lpddr2-timings.txt for more information on "lpddr2-timings"
-
-Example:
-
-elpida_ECB240ABACN : lpddr2 {
- compatible = "Elpida,ECB240ABACN","jedec,lpddr2-s4";
- density = <2048>;
- io-width = <32>;
-
- tRPab-min-tck = <3>;
- tRCD-min-tck = <3>;
- tWR-min-tck = <3>;
- tRASmin-min-tck = <3>;
- tRRD-min-tck = <2>;
- tWTR-min-tck = <2>;
- tXP-min-tck = <2>;
- tRTP-min-tck = <2>;
- tCKE-min-tck = <3>;
- tCKESR-min-tck = <3>;
- tFAW-min-tck = <8>;
-
- timings_elpida_ECB240ABACN_400mhz: lpddr2-timings@0 {
- compatible = "jedec,lpddr2-timings";
- min-freq = <10000000>;
- max-freq = <400000000>;
- tRPab = <21000>;
- tRCD = <18000>;
- tWR = <15000>;
- tRAS-min = <42000>;
- tRRD = <10000>;
- tWTR = <7500>;
- tXP = <7500>;
- tRTP = <7500>;
- tCKESR = <15000>;
- tDQSCK-max = <5500>;
- tFAW = <50000>;
- tZQCS = <90000>;
- tZQCL = <360000>;
- tZQinit = <1000000>;
- tRAS-max-ns = <70000>;
- };
-
- timings_elpida_ECB240ABACN_200mhz: lpddr2-timings@1 {
- compatible = "jedec,lpddr2-timings";
- min-freq = <10000000>;
- max-freq = <200000000>;
- tRPab = <21000>;
- tRCD = <18000>;
- tWR = <15000>;
- tRAS-min = <42000>;
- tRRD = <10000>;
- tWTR = <10000>;
- tXP = <7500>;
- tRTP = <7500>;
- tCKESR = <15000>;
- tDQSCK-max = <5500>;
- tFAW = <50000>;
- tZQCS = <90000>;
- tZQCL = <360000>;
- tZQinit = <1000000>;
- tRAS-max-ns = <70000>;
- };
-
-}
--
2.32.0