Re: [PATCH 1/2] mux:adgs1408/1409: New driver for Analog Devices ADGS1408/1409 mux â

[Lars-Peter Clausen]

On 07/14/2018 02:04 PM, Peter Rosin wrote:
[...]
>> +static int adgs140x_spi_reg_write(struct spi_device *spi,
>> +				u8 reg_addr, u8 reg_data)
>> +{
>> +	u8 tx_buf[2];
>> +
>> +	tx_buf[0] = reg_addr;
>> +	tx_buf[1] = reg_data;
>> +
>> +	return spi_write_then_read(spi, tx_buf, sizeof(tx_buf), NULL, 0);
> 
> 	return spi_write(spi, tx_buf, sizeof(tx_buf));

Be aware spi_write_then_read() can handle on stack buffers, spi_write() can't.