From: Mikko Perttunen <mperttunen@xxxxxxxxxx>
Add binding documentation for the nvidia,tegra124-emc device tree node.
Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
---
v2: * Specify the unit addresses for the timings and timing nodes
---
.../bindings/memory-controllers/tegra-emc.txt | 118 +++++++++++++++++++++
1 file changed, 118 insertions(+)
create mode 100644 Documentation/devicetree/bindings/memory-controllers/tegra-emc.txt
diff --git a/Documentation/devicetree/bindings/memory-controllers/tegra-emc.txt b/Documentation/devicetree/bindings/memory-controllers/tegra-emc.txt
new file mode 100644
index 0000000..fe64d57
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/tegra-emc.txt
@@ -0,0 +1,118 @@
+NVIDIA Tegra124 SoC EMC (external memory controller)
+====================================================
+
+Required properties :
+- compatible : Should be "nvidia,tegra124-emc".
+- reg : physical base address and length of the controller's registers.
+- nvidia,memory-controller : phandle of the MC driver.
+
+The node should contain a "timings" subnode for each supported RAM type (see
+field RAM_CODE in register PMC_STRAPPING_OPT_A), with its unit address being its
+RAM_CODE.
+
+Required properties for "timings" nodes :
+- nvidia,ram-code : Should contain the value of RAM_CODE this timing set is used
+for.
+
+Each "timings" node should contain a "timing" subnode for every supported EMC
+clock rate. The "timing" subnodes should have the clock rate in Hz as their unit
+address.
+
+Required properties for "timing" nodes :
+- clock-frequency : Should contain the memory clock rate in Hz.
+- The following properties contain EMC timing characterization values (specified
+in the board documentation) :
+ - nvidia,emc-zcal-cnt-long
+ - nvidia,emc-auto-cal-interval
+ - nvidia,emc-ctt-term-ctrl
+ - nvidia,emc-cfg
+ - nvidia,emc-cfg-2
+ - nvidia,emc-sel-dpd-ctrl
+ - nvidia,emc-cfg-dig-dll
+ - nvidia,emc-bgbias-ctl0
+ - nvidia,emc-auto-cal-config
+ - nvidia,emc-auto-cal-config2
+ - nvidia,emc-auto-cal-config3
+ - nvidia,emc-mode-reset
+ - nvidia,emc-mode-1
+ - nvidia,emc-mode-2
+ - nvidia,emc-mode-4
+- nvidia,emc-configuration : EMC timing characterization data to be written to
+the EMC registers, as specified by the board documentation.
+
+Example SoC include file:
+
+/ {
+ emc@0,7001b000 {
+ compatible = "nvidia,tegra124-emc";
+ reg = <0x0 0x7001b000 0x0 0x1000>;
+
+ nvidia,memory-controller = <&mc>;
+ };
+};
+
+Example board file:
+
+/ {
+ emc@0,7001b000 {
+ timings@3 {
+ nvidia,ram-code = <3>;
+
+ timing@12750000 {
+ clock-frequency = <12750000>;
+
+ nvidia,emc-zcal-cnt-long = <0x00000042>;
+ nvidia,emc-auto-cal-interval = <0x001fffff>;
+ nvidia,emc-ctt-term-ctrl = <0x00000802>;
+ nvidia,emc-cfg = <0x73240000>;
+ nvidia,emc-cfg-2 = <0x000008c5>;
+ nvidia,emc-sel-dpd-ctrl = <0x00040128>;
+ nvidia,emc-cfg-dig-dll = <0x002c0068>;
+ nvidia,emc-bgbias-ctl0 = <0x00000008>;
+ nvidia,emc-auto-cal-config = <0xa1430000>;
+ nvidia,emc-auto-cal-config2 = <0x00000000>;
+ nvidia,emc-auto-cal-config3 = <0x00000000>;
+ nvidia,emc-mode-reset = <0x80001221>;
+ nvidia,emc-mode-1 = <0x80100003>;
+ nvidia,emc-mode-2 = <0x80200008>;
+ nvidia,emc-mode-4 = <0x00000000>;
+
+ nvidia,emc-configuration = <
+ 0x00000000 /* EMC_RC */
+ 0x00000003 /* EMC_RFC */
+ 0x00000000 /* EMC_RFC_SLR */
+ 0x00000000 /* EMC_RAS */
+ 0x00000000 /* EMC_RP */
+ >;
+ };
+
+ timing@20400000 {
+ clock-frequency = <20400000>;
+
+ nvidia,emc-zcal-cnt-long = <0x00000042>;
+ nvidia,emc-auto-cal-interval = <0x001fffff>;
+ nvidia,emc-ctt-term-ctrl = <0x00000802>;
+ nvidia,emc-cfg = <0x73240000>;
+ nvidia,emc-cfg-2 = <0x000008c5>;
+ nvidia,emc-sel-dpd-ctrl = <0x00040128>;
+ nvidia,emc-cfg-dig-dll = <0x002c0068>;
+ nvidia,emc-bgbias-ctl0 = <0x00000008>;
+ nvidia,emc-auto-cal-config = <0x00000000>;
+ nvidia,emc-auto-cal-config2 = <0x00000000>;
+ nvidia,emc-auto-cal-config3 = <0xa1430000>;
+ nvidia,emc-mode-reset = <0x80001221>;
+ nvidia,emc-mode-1 = <0x80100003>;
+ nvidia,emc-mode-2 = <0x80200008>;
+ nvidia,emc-mode-4 = <0x00000000>;
+
+ nvidia,emc-configuration = <
+ 0x00000000
+ 0x00000005
+ 0x00000000
+ 0x00000000
+ 0x00000000
+ >;
+ };
+ };
+ };
+};
--
1.9.3
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