aboutsummaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/lpddr2/lpddr2-timings.txt
diff options
context:
space:
mode:
authorOlof Johansson <olof@lixom.net>2012-10-04 23:17:25 -0400
committerOlof Johansson <olof@lixom.net>2012-10-04 23:17:25 -0400
commit54d69df5849ec2e660aa12ac75562618c10fb499 (patch)
treeadbfb8bcc7cc73b83bf2b784fa331911ba03573a /Documentation/devicetree/bindings/lpddr2/lpddr2-timings.txt
parentad932bb6b549722a561fb31ac2fa50dcbcb3e36b (diff)
parent46f2007c1efadfa4071c17e75f140c47f09293de (diff)
Merge branch 'late/kirkwood' into late/soc
Merge in the late Kirkwood branch with the OMAP late branch for upstream submission. Final contents described in shared tag. Fixup remove/change conflicts in arch/arm/mach-omap2/devices.c and drivers/spi/spi-omap2-mcspi.c. Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'Documentation/devicetree/bindings/lpddr2/lpddr2-timings.txt')
-rw-r--r--Documentation/devicetree/bindings/lpddr2/lpddr2-timings.txt52
1 files changed, 52 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/lpddr2/lpddr2-timings.txt b/Documentation/devicetree/bindings/lpddr2/lpddr2-timings.txt
new file mode 100644
index 000000000000..9ceb19e0c7fd
--- /dev/null
+++ b/Documentation/devicetree/bindings/lpddr2/lpddr2-timings.txt
@@ -0,0 +1,52 @@
1* AC timing parameters of LPDDR2(JESD209-2) memories for a given speed-bin
2
3Required properties:
4- compatible : Should be "jedec,lpddr2-timings"
5- min-freq : minimum DDR clock frequency for the speed-bin. Type is <u32>
6- max-freq : maximum DDR clock frequency for the speed-bin. Type is <u32>
7
8Optional properties:
9
10The following properties represent AC timing parameters from the memory
11data-sheet of the device for a given speed-bin. All these properties are
12of type <u32> and the default unit is ps (pico seconds). Parameters with
13a different unit have a suffix indicating the unit such as 'tRAS-max-ns'
14- tRCD
15- tWR
16- tRAS-min
17- tRRD
18- tWTR
19- tXP
20- tRTP
21- tDQSCK-max
22- tFAW
23- tZQCS
24- tZQinit
25- tRPab
26- tZQCL
27- tCKESR
28- tRAS-max-ns
29- tDQSCK-max-derated
30
31Example:
32
33timings_elpida_ECB240ABACN_400mhz: lpddr2-timings@0 {
34 compatible = "jedec,lpddr2-timings";
35 min-freq = <10000000>;
36 max-freq = <400000000>;
37 tRPab = <21000>;
38 tRCD = <18000>;
39 tWR = <15000>;
40 tRAS-min = <42000>;
41 tRRD = <10000>;
42 tWTR = <7500>;
43 tXP = <7500>;
44 tRTP = <7500>;
45 tCKESR = <15000>;
46 tDQSCK-max = <5500>;
47 tFAW = <50000>;
48 tZQCS = <90000>;
49 tZQCL = <360000>;
50 tZQinit = <1000000>;
51 tRAS-max-ns = <70000>;
52};