Hi,

Am 01.09.2014 15:33, schrieb Fabio Estevam:

Hi Stefan,

On Mon, Sep 1, 2014 at 3:31 AM, Stefan Wahren [off-list ref] wrote:

quoted

thanks. Okay, that leads to more questions:

How can i test a ported mxs-regulator driver, that it's really working? Is
there any userspace interface?

After you ported the mxs regulator you can check whether it probed
correctly and if the reported voltages in the kernel log match the
register settings. You can also check if the voltages are really in
the correct reported value with a scope.

On mx6q we have the following:

[    0.070554] vdd1p1: 800 <--> 1375 mV at 1100 mV
[    0.071521] vdd3p0: 2800 <--> 3150 mV at 3000 mV
[    0.072397] vdd2p5: 2000 <--> 2750 mV at 2400 mV
[    0.073369] vddarm: 725 <--> 1450 mV at 1150 mV
[    0.074282] vddpu: 725 <--> 1450 mV at 1150 mV
[    0.075247] vddsoc: 725 <--> 1450 mV at 1200 mV

and you should get something like that in your kernel log after you
ported the mxs regulator driver.

i've ported the mxs-regulator driver and now i'm getting an probing 
output like above with Linux 3.17-rc4.

Now i want to test the mxs-regulator driver with the cpufreq-cpu0 as 
consumer. So i defined cpu at 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?

Best regards
Stefan

PS: Here the relevant config:

# .config
#
# CPU Frequency scaling
#
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT=y
# CONFIG_CPU_FREQ_STAT_DETAILS is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
# CONFIG_CPU_FREQ_GOV_PERFORMANCE is not set
# CONFIG_CPU_FREQ_GOV_POWERSAVE is not set
CONFIG_CPU_FREQ_GOV_USERSPACE=y
# CONFIG_CPU_FREQ_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_GOV_CONSERVATIVE is not set
CONFIG_GENERIC_CPUFREQ_CPU0=m

# imx28.dtsi

[...]

cpus {
	#address-cells = <1>;
	#size-cells = <0>;

	cpu: cpu at 0 {
		compatible = "arm,arm926ej-s";
		device_type = "cpu";
		operating-points = <
			/* kHz	uV */
			454736	1550000
			392727	1475000
			360000	1375000
			261818	1275000
			64000	1050000
		>;
		clock-latency = <61036>; /* two CLK32 periods */
		cpu0-supply = <&reg_vddd>;
	};
};

[...]

power: power at 80044000 {
	compatible = "simple-bus";
	#address-cells = <1>;
	#size-cells = <1>;
	reg = <0x80044000 0x2000>;
	ranges;

	reg_vddd: regulator at 80044040 {
		reg = <0x80044040 0x10>;
		compatible = "fsl,mxs-regulator";
		regulator-name = "vddd";
		regulator-min-microvolt = <800000>;
		regulator-max-microvolt = <1575000>;
		regulator-boot-on;
		vddd-supply = <&reg_vdda>;
	};

	reg_vdda: regulator at 80044050 {
		reg = <0x80044050 0x10>;
		compatible = "fsl,mxs-regulator";
		regulator-name = "vdda";
		regulator-min-microvolt = <1500000>;
		regulator-max-microvolt = <2275000>;
		regulator-boot-on;
		vdda-supply = <&reg_vddio>;
	};

	reg_vddio: regulator at 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 at 800440c0 {
		reg = <0x800440c0 0x10>;
		status = "disabled";
	};
};