[PATCH 7/7] ARM: dts: add OPPs for i.MX23/i.MX28
From: Juergen Borleis <hidden>
Date: 2015-03-24 20:45:23
Also in:
linux-devicetree, linux-pm
Stefan Wahren wrote:
quoted hunk ↗ jump to hunk
[...]diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi index 98c1be6..21c1921 100644 --- a/arch/arm/boot/dts/imx28.dtsi +++ b/arch/arm/boot/dts/imx28.dtsi@@ -38,12 +38,23 @@ }; cpus { - #address-cells = <0>; + #address-cells = <1>; #size-cells = <0>; - cpu { + cpu at 0 { compatible = "arm,arm926ej-s"; device_type = "cpu"; + reg = <0x0>; + operating-points = < + /* kHz uV */ + 261819 1350000 + 360000 1350000 + 392728 1450000 + 454737 1550000 + >; + clocks = <&clks 4>; + clock-latency = <61036>; /* two CLK32 periods */ + cpu-supply = <®_vddd>; }; };
Maybe you should take into account not to reduce VDD below 1.55 V if the SDRAM
controller runs above 196 MHz. The i.MX28 datasheet[1] lists these
restrictions. VDD powers the SDRAM controller as well. From the datasheet the
table "Frequency versus Voltage for EMICLK" shows:
EMICLK Fmax (MHz)
VDDD (V) DDR2 mDDR
--------------------------------
1.550 205.71 205.71
1.450 196.36 196.36
1.350 196.36 196.36
jbe
[1]
i.MX28 Applications
Processors for Consumer
Products
Silicon Version 1.2
Document Number: IMX28CEC
Rev. 3, 07/2012