Hi Thomas, On Fri, Aug 09, 2024 at 04:52:07PM GMT, Thomas Richard wrote: > Add i2c support for the Congatec Board Controller. do you mind adding some more description? > Signed-off-by: Thomas Richard <thomas.richard@xxxxxxxxxxx> ... > +config I2C_CGBC > + tristate "Congatec I2C Controller" > + depends on MFD_CGBC > + help > + This enables the I2C bus interfaces for the Congatec Board This what? :-) > + Controller. > + > + This driver can also be built as a module. If so, the module will > + be called i2c-cgbc.ko. > + ... > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/i2c.h> > +#include <linux/iopoll.h> please sort includes in alphabetical order? > +#include <linux/mfd/cgbc.h> ... > +enum i2c_state { > + STATE_DONE = 0, > + STATE_INIT, > + STATE_START, > + STATE_READ, > + STATE_WRITE, > + STATE_ERROR, > +}; can you please use the cgbc prefix for this enum and all the members? ... > + if (bus_frequency > CGBC_I2C_FREQ_MAX_HZ || > + bus_frequency < CGBC_I2C_FREQ_MIN_HZ) { > + dev_warn(i2c->dev, "invalid frequency %u, using default\n", bus_frequency); should this rather be a dev_info()? (supernit: please start with capital leter). > + bus_frequency = I2C_MAX_STANDARD_MODE_FREQ; > + } > + > + cmd[0] = CGBC_I2C_CMD_SPEED | algo_data->bus_id; > + cmd[1] = cgbc_i2c_freq_to_reg(bus_frequency); > + > + ret = cgbc_command(cgbc, &cmd, sizeof(cmd), &data, 1, NULL); > + if (ret) > + return dev_err_probe(i2c->dev, ret, > + "Failed to initialize I2C bus %s", > + adap->name); > + > + cmd[1] = 0x00; > + > + ret = cgbc_command(cgbc, &cmd, sizeof(cmd), &data, 1, NULL); > + if (ret) > + return dev_err_probe(i2c->dev, ret, > + "Failed to get I2C bus frequency"); > + > + bus_frequency = cgbc_i2c_reg_to_freq(data); > + > + dev_dbg(i2c->dev, "%s is running at %d Hz\n", adap->name, bus_frequency); > + > + /* > + * The read_maxtime_us is the maximum time to wait during a read to get > + * data. At maximum CGBC_I2C_READ_MAX_LEN can be read by command. > + * So calculate the max time to size correctly the timeout. > + */ this comment is a bit wild, can we rephrase to something like: /* * The read_maxtime_us variable represents the maximum time to wait * for data during a read operation. The maximum amount of data that * can be read by a command is CGBC_I2C_READ_MAX_LEN. * Therefore, calculate the max time to properly size the timeout. */ (it's a suggestion, please choose the words you prefer). Andi