How to integrate Bq24725 and MAX172011G ICs into Kernel/Android 9?

Luc Pham

Other Parts Discussed in Thread: BQ24725, BQ24257

Hi everyone,

We are using Bq24725 and MAX172011G to design charging and power management circuits for our NXP IMX8M processor board running Android 9. Anyone can guide me to integrate components of the operating system Android 9 (Kernel) to interact with these two ICs: device tree, sample code ...

How can I show the percentage of battery from the outputs of these two ICs on Android / Linux operating system?

Pin connection between these IC and IMX8M processor is as follows:

Bq24725	SoC IMX8M
I2c_sda	I2c_sda4
I2c_scl	I2c_scl4
ACOK	GPIO1_15
IOUT	GPIO1_13
MAX172011G	SoC IMX8M
I2c_sda	I2c_sda4
I2c_scl	I2c_scl4
ALRT1	SAI5_MCLK (GPIO3_25)

Best Regards,

Thanks!

over 4 years ago

0 Ricardo over 4 years ago

TI__Genius 10385 points

Luc,

We do have a driver for BQ24725 that was developed for kernel 4.4 (this should play nicely with Android 9). The charger and driver are not capable of reporting battery percentage as the IC is not capable of determining battery percentage. I have provided the link to the commit and patch below:

https://git.ti.com/gitweb?p=bms-linux/bms-kernel-4-4.git;a=commit;h=0b49522b0e11fc9f67d091998d5fc62af3ab5ec8

The Maxim fuel gauge you have mentioned should be able to report battery percentages, but we do not offer support for Maxim products. We do offer support and drivers for many of our TI fuel gauges. Please create a new thread with the TI battery gauge team if you would like to know more about TI's battery gauge ICs.

I hope this resolves your issue,

Ricardo

0 Luc Pham over 4 years ago in reply to Ricardo

Prodigy 20 points

Hi Ricardo,

I am viewing the document file in the linux kernel elixir.bootlin.com/.../bq24257.txt
I am wondering, to communicate with the IC through this driver, do I have to declare anything in the kernel device tree? An example paragraph in this tutorial is as follows:
bq24257 {
compatible = "ti, bq24257";
reg = <0x6a>;
interrupt-parent = <& gpio1>;
interrupts = <16 IRQ_TYPE_EDGE_BOTH>;

pg-gpios = <& gpio1 28 GPIO_ACTIVE_HIGH>;

ti, battery-regulation-voltage = <4200000>;
ti, charge-current = <1000000>;
ti, termination-current = <50000>;
};

Thank you very much for your help!

Best regards

0 Ricardo over 4 years ago in reply to Luc Pham

TI__Genius 10385 points

Luc,
You are correct. Looking at the code below you can see that the driver looks for ti,ac-detect-gpios, ti,charge-current, ti,charge-voltage, ti,input-current, and ti,enable-wdt in the devicetree. You can follow the example you have posted, but remove pg-gpios (replace with ti,ac-detect-gpios), remove ti,battery-regulation-voltage (replace with ti,charge-voltage), and remove ti,termination-current.
 static struct bq24725_platform *bq24725_parse_dt_data(struct i2c_client *client)
 {
         struct bq24725_platform *pdata;
         struct device_node *np = client->dev.of_node;
         u32 val;
         int ret;
         enum of_gpio_flags flags;
         pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
         if (!pdata) {
                 dev_err(&client->dev,
                         "Memory alloc for bq24725 pdata failed\n");
                 return NULL;
         }
         pdata->status_gpio = of_get_named_gpio_flags(np, "ti,ac-detect-gpios",
                                                      0, &flags);
         if (flags & OF_GPIO_ACTIVE_LOW)
                 pdata->status_gpio_active_low = 1;
         ret = of_property_read_u32(np, "ti,charge-current", &val);
         if (!ret)
                 pdata->charge_current = val;
         ret = of_property_read_u32(np, "ti,charge-voltage", &val);
         if (!ret)
                 pdata->charge_voltage = val;
         ret = of_property_read_u32(np, "ti,input-current", &val);
         if (!ret)
                 pdata->input_current = val;
         pdata->enable_wdt = of_property_read_bool(np, "ti,enable-wdt");
         return pdata;
 }
I hope this resolves your issue,
Ricardo

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How to integrate Bq24725 and MAX172011G ICs into Kernel/Android 9?