Re: [PATCH v6 01/10] i3c: Add core I3C infrastructure

Hi Boris,


On 19-07-2018 16:29, Boris Brezillon wrote:

+int i3c_bus_register(struct i3c_bus *i3cbus)
+{
+	struct i2c_dev_desc *desc;
+
+	i3c_bus_for_each_i2cdev(i3cbus, desc) {
+		switch (desc->boardinfo->lvr & I3C_LVR_I2C_INDEX_MASK) {
+		case I3C_LVR_I2C_INDEX(0):
+			if (i3cbus->mode < I3C_BUS_MODE_MIXED_FAST)
+				i3cbus->mode = I3C_BUS_MODE_MIXED_FAST;
+			break;
+
+		case I3C_LVR_I2C_INDEX(1):
+		case I3C_LVR_I2C_INDEX(2):
+			if (i3cbus->mode < I3C_BUS_MODE_MIXED_SLOW)
+				i3cbus->mode = I3C_BUS_MODE_MIXED_SLOW;
+			break;
+
+		default:
+			return -EINVAL;
+		}
+	}
+
+	if (!i3cbus->scl_rate.i3c)
+		i3cbus->scl_rate.i3c = I3C_BUS_TYP_I3C_SCL_RATE;
+
+	if (!i3cbus->scl_rate.i2c) {
+		if (i3cbus->mode == I3C_BUS_MODE_MIXED_SLOW)
+			i3cbus->scl_rate.i2c = I3C_BUS_I2C_FM_SCL_RATE;
+		else
+			i3cbus->scl_rate.i2c = I3C_BUS_I2C_FM_PLUS_SCL_RATE;
+	}
+
+	/*
+	 * I3C/I2C frequency may have been overridden, check that user-provided
+	 * values are not exceeding max possible frequency.
+	 */
+	if (i3cbus->scl_rate.i3c > I3C_BUS_MAX_I3C_SCL_RATE ||
+	    i3cbus->scl_rate.i2c > I3C_BUS_I2C_FM_PLUS_SCL_RATE) {
+		return -EINVAL;
+	}
+
+	dev_set_name(&i3cbus->dev, "i3c-%d", i3cbus->id);
+
+	return device_add(&i3cbus->dev);
+}

During the tests of the bus with i2c devices I found the i2c_dev_desc 
objects aren't allocated before this function. This cause i3cbus->mode = 
I3C_BUS_MODE_PURE.

I want to do something for the slave and secondary master, do you 
already have infrastructure that you can share?


Best regards,
Vitor Soares