IMX8mm cpu-freq scaling issue

[saurav-pandya]

Hi NXP Team,

I am working on imx8mm and try to change CPU frequency but I did't get any sysfs entry to get information of CPU frequency and set CPU frequency.

$ ls /sys/devices/system/cpu/cpu0/
cache cpuidle crash_notes_size node0 online regs topology
cpu_capacity crash_notes hotplug of_node power subsystem uevent

missing cpufreq folder to set or get frequency for CPU.

$ cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
no or unknown cpufreq driver is active on this CPU
analyzing CPU 1:
no or unknown cpufreq driver is active on this CPU
analyzing CPU 2:
no or unknown cpufreq driver is active on this CPU
analyzing CPU 3:
no or unknown cpufreq driver is active on this CPU

Also apply above command but still error.

Please help me.

Thanks,

Saurav

[joanxie]

what pmic and bsp version do you use?

[saurav-pandya]

Hi joanxie,

I used ROHM BD71847MWV and BSP version 5.15-kirkstone.

Thanks,

Saurav

[joanxie]

The response from the R&D was that the ROHM PMIC board has been dropped in recent linux release, we only support NXP PMIC board by default for LPDDR4 EVK board. Customer may need to cherry pick the ROHM PMIC patch from older release by themselves.

[saurav-pandya]

Hi ,

I have changes as per .dtb of imx8mm-evk-qca-wifi.dts.

pmic_rohm: pmic@4b {
compatible = "rohm,bd71837";
reg = <0x4b>;
pinctrl-0 = <&pinctrl_pmic>;
interrupt-parent = <&gpio1>;
interrupts = IRQ_TYPE_LEVEL_LOW>;
rohm,reset-snvs-powered;

regulators {
buck1_reg: BUCK1 {
regulator-name = "BUCK1";
regulator-min-microvolt = <700000>;
regulator-max-microvolt = <1300000>;
regulator-boot-on;
regulator-always-on;
regulator-ramp-delay = <1250>;
//rohm,dvs-run-voltage = <850000>;
//rohm,dvs-standby-voltage = <800000>;
};

buck2_reg: BUCK2 {
regulator-name = "BUCK2";
regulator-min-microvolt = <700000>;
regulator-max-microvolt = <1300000>;
regulator-boot-on;
regulator-always-on;
regulator-ramp-delay = <1250>;
rohm,dvs-run-voltage = <1000000>;

rohm,dvs-idle-voltage = <900000>;
};

buck3_reg: BUCK3 {
// BUCK5 in datasheet
regulator-name = "BUCK3";
regulator-min-microvolt = <700000>;
regulator-max-microvolt = <1350000>;
regulator-boot-on;
regulator-always-on;
};

buck4_reg: BUCK4 {
// BUCK6 in datasheet
regulator-name = "BUCK4";
regulator-min-microvolt = <3000000>;
regulator-max-microvolt = <3300000>;
regulator-boot-on;
regulator-always-on;
};

buck5_reg: BUCK5 {
// BUCK7 in datasheet
regulator-name = "BUCK5";
regulator-min-microvolt = <1605000>;
regulator-max-microvolt = <1995000>;
regulator-boot-on;
regulator-always-on;
};

buck6_reg: BUCK6 {
// BUCK8 in datasheet
regulator-name = "BUCK6";
regulator-min-microvolt = <800000>;
regulator-max-microvolt = <1400000>;
regulator-boot-on;
regulator-always-on;
};

ldo1_reg: LDO1 {
regulator-name = "LDO1";
regulator-min-microvolt = <1600000>;
regulator-max-microvolt = <1900000>;
regulator-boot-on;
regulator-always-on;
};

ldo2_reg: LDO2 {
regulator-name = "LDO2";
regulator-min-microvolt = <800000>;
regulator-max-microvolt = <900000>;
regulator-boot-on;
regulator-always-on;
};

ldo3_reg: LDO3 {
regulator-name = "LDO3";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <3300000>;
regulator-boot-on;
regulator-always-on;
};

ldo4_reg: LDO4 {
regulator-name = "LDO4";
regulator-min-microvolt = <900000>;
regulator-max-microvolt = <1800000>;
regulator-boot-on;
regulator-always-on;
};

ldo6_reg: LDO6 {
regulator-name = "LDO6";
regulator-min-microvolt = <900000>;
regulator-max-microvolt = <1800000>;
regulator-boot-on;
regulator-always-on;
};
};
};

still i got error. 

root@imx8mm-loop:~# dmesg | grep -i bd
[ 0.000000] NUMA: Faking a node at [mem 0x0000000040000000-0x00000000bdffffff]
[ 0.000000] NUMA: NODE_DATA [mem 0x95bd1800-0x95bd3fff]
[ 0.000000] DMA [mem 0x0000000040000000-0x00000000bdffffff]
[ 0.000000] node 0: [mem 0x0000000040000000-0x00000000bdffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000040000000-0x00000000bdffffff]
[ 2.053437] bd718xx-pmic bd71837-pmic.3.auto: failed to register buck4 regulator
[ 2.060849] bd718xx-pmic: probe of bd71837-pmic.3.auto failed with error -22
[ 2.181657] CSI: Registered sensor subdevice: mxc_mipi-csi.0
[ 2.281357] input: bd718xx-pwrkey as /devices/platform/soc@0/30800000.bus/30a20000.i2c/i2c-0/0-004b/gpio-keys.1.auto/input/input1
[ 7.777168] imx-sdma 30bd0000.dma-controller: firmware found.
[ 36.800991] rohm-bd718x7 0-004b: Failed to read IRQ status: -110

Please help me.

Thanks,

Saurav

[joanxie]

what do you get when you use command

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies

[joanxie]

what parameters under /sys/devices/system/cpu/cpu0/cpufreq/?

[saurav-pandya]

that's folder isn't available in that directory

[saurav-pandya]

No such file or directory

[joanxie]

couldn't reproduce this on imx8mm ROMH board, if you add this in the dts file, should be get the device node

[joanxie]

what board do you use? is you PMIC design the same as nxp imx8mm lpddr4 with Rohm board?

[saurav-pandya]

used imx8mm board with rohm PMIC

[saurav-pandya]

Ohk.

I will check and update