memory-controllers/ddr/jedec%2Clpddr2.yaml

1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,lpddr2.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: LPDDR2 SDRAM compliant to JEDEC JESD209-2
10   - Krzysztof Kozlowski <krzk@kernel.org>
13   - $ref: jedec,lpddr-props.yaml#
18       - items:
19           - enum:
20               - elpida,ECB240ABACN
21               - elpida,B8132B2PB-6D-F
22           - enum:
23               - jedec,lpddr2-nvm
24               - jedec,lpddr2-s2
25               - jedec,lpddr2-s4
26       - items:
27           - pattern: "^lpddr2-[0-9a-f]{2},[0-9a-f]{4}$"
28           - enum:
29               - jedec,lpddr2-nvm
30               - jedec,lpddr2-s2
31               - jedec,lpddr2-s4
33   revision-id1:
38       Property is deprecated, use revision-id instead.
41   revision-id2:
46       Property is deprecated, use revision-id instead.
49   tRRD-min-tck:
56   tWTR-min-tck:
60       Internal WRITE-to-READ command delay in terms of number of clock cycles.
63   tXP-min-tck:
67       Exit power-down to next valid command delay in terms of number of clock
70   tRTP-min-tck:
77   tCKE-min-tck:
84   tRPab-min-tck:
91   tRCD-min-tck:
95       RAS-to-CAS delay in terms of number of clock cycles. Obtained from
98   tWR-min-tck:
105   tRASmin-min-tck:
112   tCKESR-min-tck:
120   tFAW-min-tck:
124       Four-bank activate window in terms of number of clock cycles. Obtained
128   "^lpddr2-timings":
129     $ref: jedec,lpddr2-timings.yaml
131       The lpddr2 node may have one or more child nodes of type "lpddr2-timings".
132       "lpddr2-timings" provides AC timing parameters of the device for
133       a given speed-bin. The user may provide the timings for as many
134       speed-bins as is required.
137   - compatible
138   - density
139   - io-width
144   - |
146         compatible = "elpida,ECB240ABACN", "jedec,lpddr2-s4";
148         io-width = <32>;
149         revision-id = <1 0>;
151         tRPab-min-tck = <3>;
152         tRCD-min-tck = <3>;
153         tWR-min-tck = <3>;
154         tRASmin-min-tck = <3>;
155         tRRD-min-tck = <2>;
156         tWTR-min-tck = <2>;
157         tXP-min-tck = <2>;
158         tRTP-min-tck = <2>;
159         tCKE-min-tck = <3>;
160         tCKESR-min-tck = <3>;
161         tFAW-min-tck = <8>;
163         timings_elpida_ECB240ABACN_400mhz: lpddr2-timings0 {
164             compatible = "jedec,lpddr2-timings";
165             min-freq = <10000000>;
166             max-freq = <400000000>;
170             tRAS-min = <42000>;
176             tDQSCK-max = <5500>;
177             tFAW = <50000>;
181             tRAS-max-ns = <70000>;
184         timings_elpida_ECB240ABACN_200mhz: lpddr2-timings1 {
185             compatible = "jedec,lpddr2-timings";
186             min-freq = <10000000>;
187             max-freq = <200000000>;
191             tRAS-min = <42000>;
197             tDQSCK-max = <5500>;
198             tFAW = <50000>;
202             tRAS-max-ns = <70000>;