[PATCH v4 15/20] i2c: cht-wc: Make charger i2c-client instantiation board/device-model specific

Hans de Goede
2022-01-30T20:47:43Z

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 this was hardcoded to instantiate an i2c-client for the
bq24292i, with all properties, etc. set to match how this charger
is used on the GPD win and GPD pocket devices.

There is a rudimentary check to make sure the ACPI tables are at least
somewhat as expected, but this is far from accurate, leading to
a wrong i2c-client being instantiated for the charger on some boards.

Switch to the new DMI based intel_cht_wc_get_model() helper which is
exported by the MFD driver for the CHT Whiskey Cove PMIC to help PMIC
cell drivers like the i2c-cht-wc code reliably detect which board
they are running on.

And add board_info for the charger ICs as found on the other 2 known
boards with a Whisky Cove PMIC.

This has been tested on all 3 known boards.

Acked-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v3:
- Add Wolfram's Ack for taking this upstream through another tree
then the i2c tree
- Some minor tweaks / spelling fixes based on Andy's review
---
drivers/i2c/busses/i2c-cht-wc.c | 120 +++++++++++++++++++++++++++-----
1 file changed, 102 insertions(+), 18 deletions(-)

diff --git a/drivers/i2c/busses/i2c-cht-wc.c b/drivers/i2c/busses/i2c-cht-wc.c
index 1cf68f85b2e1..54e909f9eab6 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
@@ -270,6 +271,7 @@ static const struct irq_chip cht_wc_i2c_irq_chip = {
.name = "cht_wc_ext_chrg_irq_chip",
};

+/********** GPD Win / Pocket charger IC settings **********/
static const char * const bq24190_suppliers[] = {
"tcpm-source-psy-i2c-fusb302" };

@@ -304,17 +306,92 @@ static struct bq24190_platform_data bq24190_pdata = {
.regulator_init_data = &bq24190_vbus_init_data,
};

+static struct i2c_board_info gpd_win_board_info = {
+ .type = "bq24190",
+ .addr = 0x6b,
+ .dev_name = "bq24190",
+ .swnode = &bq24190_node,
+ .platform_data = &bq24190_pdata,
+};
+
+/********** Xiaomi Mi Pad 2 charger IC settings **********/
+static struct regulator_consumer_supply bq2589x_vbus_consumer = {
+ .supply = "vbus",
+ .dev_name = "cht_wcove_pwrsrc",
+};
+
+static const struct regulator_init_data bq2589x_vbus_init_data = {
+ .constraints = {
+ .valid_ops_mask = REGULATOR_CHANGE_STATUS,
+ },
+ .consumer_supplies = &bq2589x_vbus_consumer,
+ .num_consumer_supplies = 1,
+};
+
+static struct bq25890_platform_data bq2589x_pdata = {
+ .regulator_init_data = &bq2589x_vbus_init_data,
+};
+
+static const struct property_entry xiaomi_mipad2_props[] = {
+ PROPERTY_ENTRY_BOOL("linux,skip-reset"),
+ PROPERTY_ENTRY_BOOL("linux,read-back-settings"),
+ { }
+};
+
+static const struct software_node xiaomi_mipad2_node = {
+ .properties = xiaomi_mipad2_props,
+};
+
+static struct i2c_board_info xiaomi_mipad2_board_info = {
+ .type = "bq25890",
+ .addr = 0x6a,
+ .dev_name = "bq25890",
+ .swnode = &xiaomi_mipad2_node,
+ .platform_data = &bq2589x_pdata,
+};
+
+/********** Lenovo Yogabook YB1-X90F/-X91F/-X91L charger settings **********/
+static const char * const lenovo_yb1_bq25892_suppliers[] = { "cht_wcove_pwrsrc" };
+
+static const struct property_entry lenovo_yb1_bq25892_props[] = {
+ PROPERTY_ENTRY_STRING_ARRAY("supplied-from",
+ lenovo_yb1_bq25892_suppliers),
+ PROPERTY_ENTRY_U32("linux,pump-express-vbus-max", 12000000),
+ PROPERTY_ENTRY_BOOL("linux,skip-reset"),
+ /*
+ * The firmware sets everything to the defaults, which leads to a
+ * somewhat low charge-current of 2048mA and worse to a battery-voltage
+ * of 4.2V instead of 4.35V (when booted without a charger connected).
+ * Use our own values instead of "linux,read-back-settings" to fix this.
+ */
+ PROPERTY_ENTRY_U32("ti,charge-current", 4224000),
+ PROPERTY_ENTRY_U32("ti,battery-regulation-voltage", 4352000),
+ PROPERTY_ENTRY_U32("ti,termination-current", 256000),
+ PROPERTY_ENTRY_U32("ti,precharge-current", 128000),
+ PROPERTY_ENTRY_U32("ti,minimum-sys-voltage", 3500000),
+ PROPERTY_ENTRY_U32("ti,boost-voltage", 4998000),
+ PROPERTY_ENTRY_U32("ti,boost-max-current", 1400000),
+ PROPERTY_ENTRY_BOOL("ti,use-ilim-pin"),
+ { }
+};
+
+static const struct software_node lenovo_yb1_bq25892_node = {
+ .properties = lenovo_yb1_bq25892_props,
+};
+
+static struct i2c_board_info lenovo_yogabook1_board_info = {
+ .type = "bq25892",
+ .addr = 0x6b,
+ .dev_name = "bq25892",
+ .swnode = &lenovo_yb1_bq25892_node,
+ .platform_data = &bq2589x_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;

irq = platform_get_irq(pdev, 0);
@@ -379,17 +456,24 @@ 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);
+ switch (pmic->cht_wc_model) {
+ case INTEL_CHT_WC_GPD_WIN_POCKET:
+ board_info = &gpd_win_board_info;
+ break;
+ case INTEL_CHT_WC_XIAOMI_MIPAD2:
+ board_info = &xiaomi_mipad2_board_info;
+ break;
+ case INTEL_CHT_WC_LENOVO_YOGABOOK1:
+ board_info = &lenovo_yogabook1_board_info;
+ break;
+ default:
+ dev_warn(&pdev->dev, "Unknown model, not instantiating charger device\n");
+ break;
+ }
+
+ 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;
--
2.33.1