Re: [PATCH 11/13] i2c: cht-wc: Add support for devices using a bq25890 charger

Yauhen Kharuzhy
2021-11-07T19:07:36Z

On Sat, Oct 30, 2021 at 08:28:11PM +0200, Hans de Goede wrote:
> The i2c-controller on the Cherry Trail - Whiskey Cove PMIC is special
> in that it is always connected to the I2C charger IC of the board on
> which the PMIC is used; and the charger IC is not described in ACPI,
> so the i2c-cht-wc code needs to instantiate an i2c-client for it itself.
>
> So far there has been a rudimentary check to make sure the ACPI tables
> are at least somewhat as expected by checking for the presence of an
> INT33FE device and sofar the code has assumed that if this INT33FE
> device is present that the used charger then is a bq24290i.
>
> But some boards with an INT33FE device in their ACPI tables use a
> different charger IC and some boards don't have an INT33FE device at all.
>
> Since the information about the used charger + fuel-gauge + other chips is
> necessary in other places too, the kernel now adds a "intel,cht-wc-setup"
> string property to the Whiskey Cove PMIC i2c-client based on DMI matching,
> which reliably describes the board's setup of the PMIC.
>
> Switch to using the "intel,cht-wc-setup" property and add support for
> instantiating an i2c-client for either a bq24292i or a bq25890 charger.
>
> This has been tested on a GPD pocket (which uses the old bq24292i setup)
> and on a Xiaomi Mi Pad 2 with a bq25890 charger.
>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
> drivers/i2c/busses/i2c-cht-wc.c | 77 +++++++++++++++++++++++++--------
> 1 file changed, 59 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-cht-wc.c b/drivers/i2c/busses/i2c-cht-wc.c
> index 1cf68f85b2e1..e7d62af6c39d 100644
> --- a/drivers/i2c/busses/i2c-cht-wc.c
> +++ b/drivers/i2c/busses/i2c-cht-wc.c
> @@ -18,6 +18,7 @@
> #include <linux/module.h>
> #include <linux/platform_device.h>
> #include <linux/power/bq24190_charger.h>
> +#include <linux/power/bq25890_charger.h>
> #include <linux/slab.h>
>
> #define CHT_WC_I2C_CTRL 0x5e24
> @@ -304,18 +305,55 @@ static struct bq24190_platform_data bq24190_pdata = {
> .regulator_init_data = &bq24190_vbus_init_data,
> };
>
> +static struct i2c_board_info bq24190_board_info = {
> + .type = "bq24190",
> + .addr = 0x6b,
> + .dev_name = "bq24190",
> + .swnode = &bq24190_node,
> + .platform_data = &bq24190_pdata,
> +};
> +
> +static struct regulator_consumer_supply bq25890_vbus_consumer = {
> + .supply = "vbus",
> + .dev_name = "cht_wcove_pwrsrc",
> +};
> +
> +static const struct regulator_init_data bq25890_vbus_init_data = {
> + .constraints = {
> + .valid_ops_mask = REGULATOR_CHANGE_STATUS,
> + },
> + .consumer_supplies = &bq25890_vbus_consumer,
> + .num_consumer_supplies = 1,
> +};
> +
> +static struct bq25890_platform_data bq25890_pdata = {
> + .regulator_init_data = &bq25890_vbus_init_data,
> +};
> +
> +static const struct property_entry bq25890_props[] = {
> + PROPERTY_ENTRY_BOOL("ti,skip-init"),
> + { }
> +};

The Lenovo Yoga Book firmware set the IINLIM field to 500 mA at
initialization, we need a way to pass maximum allowed current in the fast
charging mode to driver. I have added 'ti,input-max-current' in my port, for
example.

> +
> +static const struct software_node bq25890_node = {
> + .properties = bq25890_props,
> +};
> +
> +static struct i2c_board_info bq25890_board_info = {
> + .type = "bq25890",
> + .addr = 0x6a,
> + .dev_name = "bq25890",
> + .swnode = &bq25890_node,
> + .platform_data = &bq25890_pdata,
> +};
> +
> static int cht_wc_i2c_adap_i2c_probe(struct platform_device *pdev)
> {
> struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
> + struct i2c_board_info *board_info = NULL;
> struct cht_wc_i2c_adap *adap;
> - struct i2c_board_info board_info = {
> - .type = "bq24190",
> - .addr = 0x6b,
> - .dev_name = "bq24190",
> - .swnode = &bq24190_node,
> - .platform_data = &bq24190_pdata,
> - };
> int ret, reg, irq;
> + const char *str;
>
> irq = platform_get_irq(pdev, 0);
> if (irq < 0)
> @@ -379,17 +417,20 @@ static int cht_wc_i2c_adap_i2c_probe(struct platform_device *pdev)
> if (ret)
> goto remove_irq_domain;
>
> - /*
> - * Normally the Whiskey Cove PMIC is paired with a TI bq24292i charger,
> - * connected to this i2c bus, and a max17047 fuel-gauge and a fusb302
> - * USB Type-C controller connected to another i2c bus. In this setup
> - * the max17047 and fusb302 devices are enumerated through an INT33FE
> - * ACPI device. If this device is present register an i2c-client for
> - * the TI bq24292i charger.
> - */
> - if (acpi_dev_present("INT33FE", NULL, -1)) {
> - board_info.irq = adap->client_irq;
> - adap->client = i2c_new_client_device(&adap->adapter, &board_info);
> + ret = device_property_read_string(pdev->dev.parent, "intel,cht-wc-setup", &str);
> + if (ret)
> + dev_warn(&pdev->dev, "intel,cht-wc-setup not set, not instantiating charger device\n");
> + else if (!strcmp(str, "bq24292i,max17047,fusb302,pi3usb30532"))
> + board_info = &bq24190_board_info;
> + else if (!strcmp(str, "bq25890,bq27520"))
> + board_info = &bq25890_board_info;
> + else
> + dev_warn(&pdev->dev, "Unknown intel,cht-wc-setup value: '%s', not instantiating charger device\n",
> + str);
> +
> + if (board_info) {
> + board_info->irq = adap->client_irq;
> + adap->client = i2c_new_client_device(&adap->adapter, board_info);
> if (IS_ERR(adap->client)) {
> ret = PTR_ERR(adap->client);
> goto del_adapter;
> --
> 2.31.1
>

--
Yauhen Kharuzhy