On 10/30/23 12:40, Pierre-Louis Bossart wrote: > > > On 10/30/23 12:20, Mark Brown wrote: >> On Mon, Oct 30, 2023 at 11:05:39AM -0500, Pierre-Louis Bossart wrote: >> >>>> +static bool tas2783_readable_register(struct device *dev, unsigned int reg) >>>> +{ >>>> + switch (reg) { >>>> + case 0x000 ... 0x080: /* Data port 0. */ >> >>> No, this is wrong. All the data port 'standard' registers are "owned" by >>> the SoundWire core and handled during the port prepare/configure/bank >>> switch routines. Do not use them for regmap. >> >>> In other words, you *shall* only define vendor-specific registers in >>> this codec driver. >> >> This seems to come up a moderate amount and is an understandable thing >> to do - could you (or someone else who knows SoundWire) perhaps send a >> patch for the regmap SoundWire integration which does some validation >> here during registration and at least prints a warning? > > Good suggestion, we could indeed check that the registers are NOT in the > range [0,0xBF] for all ports - only the range [0xC0..FF] is allowed for > implementation-defined values. I'll try to cook something up. After checking, the following ranges are invalid for codec drivers: for address < 0x1000 LSB = 0x00 - 0xBF standard or reserved 0x1800 – 0x1FFF reserved 0x48000000 - 0xFFFFFFFF reserved is the recommendation to check the regmap_config and its 'yes_ranges'? Presumably if the range_min or range_max is within the invalid values above then the configuration can be tagged as problematic in the dmesg log or rejected with an error code?