Some problems with kernel module und device tree..

[Osiander]

Hello guys,

I'm developing a kernel driver for a MOST NIC and have got some problems by reading the chip configuration from device tree.

Here is the configuration:

Code:

&i2c2 { pinctrl-names = "default"; pinctrl-0 = <&i2c2_pins_a>; status = "okay"; os8104: os8104@41 { compatible = "smsc,os8104"; reg = <0x41>; master = <0>; bypass = <0>; gpio_reset = <&pio 8 17>; /* PI17 */ gpio_int = <&pio 8 16>; /* PI16 */ gpio_aint = <&pio 8 19>; /* PI19 */ gpio_error = <&pio 8 18>; /* PI18 */ }; };

My NIC (os8104) is connected to i2c-2. 

And here is the corresponding code in LKM:

Code:

static int os8104_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device_node *dn; int rc; int master = 0, bypass = 0; struct os8104 *priv; dn = of_find_node_by_name(NULL, os8104_driver.driver.name); if (dn == NULL) { return -ENODEV; } rc = of_property_read_u32(dn, "master", &master); pr_err("rc = %d, master = %11d\n", rc, master); rc = of_property_read_u32(dn, "bypass", &bypass); pr_err("rc = %d, bypass = %11d\n", rc, bypass); priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); if (!priv) { return -ENOMEM; } priv->adapter = to_i2c_adapter(client->dev.parent); priv->client = client; priv->mode = val; priv->gpio_reset = of_get_named_gpio(dn, "gpio_reset", 0); priv->gpio_int = of_get_named_gpio(dn, "gpio_int", 0); priv->gpio_aint = of_get_named_gpio(dn, "gpio_aint", 0); priv->gpio_error = of_get_named_gpio(dn, "gpio_error", 0); return 0; }

If I'm loading the module, the function of_find_node_by_name find my os8104 node, then I'm able to read the both properties (master and bypass). 

But, if I do an of_get_named_gpio(dn, "gpio_reset", 0), I get for each of four gpio-properties

[ 1610.330108] OF: /soc@01c00000/i2c@01c2b400/os8104@41: arguments longer than property

in dmesg.

Any ideas?

Kernel version is 4.14.39 and SBC is a BananaPRO (Allwinner A20 SoC).

Many thanks.