Hi,
Am 23.09.2014 00:18, schrieb Fabio Estevam:
Hi Stefan,
Now i want to test the mxs-regulator driver with the cpufreq-cpu0 as
consumer. So i defined cpu@0 according to cpufreq-cpu0 binding in imx28.dtsi
and enabled cpufreq-cpu0 driver and userspace gov in Kernel config.
But if i modprobe cpufreq-cpu0 i don't get any output and the entry
/sys/devices/system/cpu/cpu0/cpufreq is also missing.
Any ideas, what's wrong or missing?
Have you registered cpufreq-cpu0 inside arch/arm/mach-mxs/mach-mxs.c?
Take a look at this patch for an example:
http://www.spinics.net/lists/arm-kernel/msg363761.html
thanks, registering cpufreq-cpu0 and adding missing properties reg &
clocks did the trick.
Now the sys interface of cpufreq is available and the mxs-regulator
seems to handle frequency change. But the frequency selection do not
work as expected. If i set cpu frequency to 454736, 392727 or 261818
kHz, the cpufreq driver change it silently to 240000 kHz.
Why? Is it the wrong clock ( 21 should be cpu )?
Thanks in advance
Stefan
PS: Here my DT and the debug output
####################### imx28.dtsi
[...]
cpus {
#address-cells = <1>;
#size-cells = <0>;
cpu@0 {
compatible = "arm,arm926ej-s";
device_type = "cpu";
reg = <0x0>;
operating-points = <
/* kHz uV */
454736 1550000
392727 1475000
360000 1375000
261818 1275000
64000 1050000
>;
clocks = <&clks 21>;
clock-latency = <61036>; /* two CLK32 periods */
cpu0-supply = <®_vddd>;
};
};
[...]
power: power@80044000 {
compatible = "simple-bus";
#address-cells = <1>;
#size-cells = <1>;
reg = <0x80044000 0x2000>;
ranges;
reg_vddd: regulator@80044040 {
reg = <0x80044040 0x10>;
compatible = "fsl,mxs-regulator";
regulator-name = "vddd";
regulator-min-microvolt = <800000>;
regulator-max-microvolt = <1575000>;
regulator-boot-on;
vddd-supply = <®_vdda>;
};
reg_vdda: regulator@80044050 {
reg = <0x80044050 0x10>;
compatible = "fsl,mxs-regulator";
regulator-name = "vdda";
regulator-min-microvolt = <1500000>;
regulator-max-microvolt = <2275000>;
regulator-boot-on;
vdda-supply = <®_vddio>;
};
reg_vddio: regulator@80044060 {
reg = <0x80044060 0x10>;
compatible = "fsl,mxs-regulator";
regulator-name = "vddio";
regulator-min-microvolt = <2800000>;
regulator-max-microvolt = <3600000>;
regulator-microvolt-offset = <80000>;
regulator-boot-on;
};
power_sts: power_sts@800440c0 {
reg = <0x800440c0 0x10>;
status = "disabled";
};
};
####################### dmesg
[ 3845.602210] cpu cpu0: Looking up cpu0-supply from device tree
[ 3845.604389] freq_table: table entry 0: 64000 kHz
[ 3845.604448] freq_table: table entry 1: 261818 kHz
[ 3845.604482] freq_table: table entry 2: 360000 kHz
[ 3845.604512] freq_table: table entry 3: 392727 kHz
[ 3845.604541] freq_table: table entry 4: 454736 kHz
[ 3845.608402] freq_table: request for verificatiorequest for
verification of policy (64000 - 454736 kHz) for cpu 0
[ 3845.608571] freq_table: verification lead to (64000 - 454736 kHz) for
cpu 0
[ 4049.590886] freq_table: request for target 392727 kHz (relation: 0)
for cpu 0
[ 4049.590957] freq_table: target index is 3, freq is:392727 kHz
[ 4049.597120] mxs_get_voltage: vddd register val 28
[ 4049.597202] cpufreq_cpu0: 454 MHz, 1500 mV --> 240 MHz, 1275 mV
[ 4049.597686] mxs_is_enabled: vddd register val 0
[ 4049.597783] mxs_get_voltage: vddd register val 28
[ 4049.597864] mxs_set_voltage: min_uV 1275000, max_uV 1275000, min
800000, max 1575000
[ 4049.597928] mxs_set_voltage: vddd calculated val 19
[ 4049.598384] mxs_get_voltage: vddd register val 19
[ 4464.831192] freq_table: request for target 360000 kHz (relation: 0)
for cpu 0
[ 4464.831609] freq_table: target index is 2, freq is:360000 kHz
[ 4464.831871] mxs_get_voltage: vddd register val 19
[ 4464.831965] cpufreq_cpu0: 240 MHz, 1275 mV --> 360 MHz, 1375 mV
[ 4464.832063] mxs_is_enabled: vddd register val 0
[ 4464.832137] mxs_get_voltage: vddd register val 19
[ 4464.832213] mxs_set_voltage: min_uV 1375000, max_uV 1375000, min
800000, max 1575000
[ 4464.832274] mxs_set_voltage: vddd calculated val 23
[ 4464.832488] mxs_get_voltage: vddd register val 23
[ 4603.949470] freq_table: request for target 261818 kHz (relation: 0)
for cpu 0
[ 4603.949548] freq_table: target index is 1, freq is:261818 kHz
[ 4603.949747] mxs_get_voltage: vddd register val 23
[ 4603.949815] cpufreq_cpu0: 360 MHz, 1375 mV --> 240 MHz, 1275 mV
[ 4603.950088] mxs_is_enabled: vddd register val 0
[ 4603.950165] mxs_get_voltage: vddd register val 23
[ 4603.950244] mxs_set_voltage: min_uV 1275000, max_uV 1275000, min
800000, max 1575000
[ 4603.950306] mxs_set_voltage: vddd calculated val 19
[ 4603.950473] mxs_get_voltage: vddd register val 19
[ 4757.663161] freq_table: request for target 454736 kHz (relation: 0)
for cpu 0
[ 4757.663267] freq_table: target index is 4, freq is:454736 kHz
[ 4757.663518] mxs_get_voltage: vddd register val 19
[ 4757.663614] cpufreq_cpu0: 240 MHz, 1275 mV --> 240 MHz, 1275 mV
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