On 24. 04. 25 9:18 odp., Andrew Lunn wrote:
During taking 613cbb91e9ce ("media: Add MIPI CCI register access helper functions") approach I found they are using for these functions u64 regardless of register size... Just to accommodate the biggest possible value. I know about weakness of 'void *' usage but u64 is not also ideal as the caller is forced to pass always 8 bytes for reading and forced to reserve 8 bytes for each read value on stack.In this device, how are the u48s used? Are they actually u48s, or are they just u8[6], for example a MAC address? The network stack has lots of functions like: eth_hw_addr_set(struct net_device *dev, const u8 *addr)
u48 registers always represent 48bit integer... they read from device using bulk read as big-endian 48bit int. The same is valid also for u16
and u32. Ivan
