[PATCH 5/6] gpio: Add new gpio-macsmc driver for Apple Macs

[Hector Martin]

On 06/09/2022 00.44, Martin Povišer wrote:
> 
>> On 5. 9. 2022, at 17:32, Russell King (Oracle) <linux at armlinux.org.uk> wrote:
> 
>> I still need a resolution between you and Hector over the smc_key
>> issue - specifically, do I pick up the patch that adds support for
>> %p4ch, or do we re-architect the smc_key thing and also in doing so
>> get rid of the need for your "endian conversion" thing.
> 
> Idea about the %p4ch thing: We will leave the keys true
> to their nature (i.e. 32-bit integer), and at least initially
> for the prints we will employ macros
> 
> #define SMC_KEYFMT “%c%c%c%c”
> #define SMC_KEYFMT_VAL(val) (val)>>24,(val)>>16,(val)>>8,(val)
> 
> used like
> 
> printk(“blah blah” SMC_KEYFMT “ blah\n”, SMC_KEYFMT_VAL(key));
> 
> This has the nice property that it is pretty much like the specifier,
> and later can be easily replaced with the real thing.

Not the prettiest, but I'll take this over trying to mess around with
string buffer conversions or anything involving non-native endianness if
the printk specifier patch is going to be controversial.

I'd prefer shorter macro names though, like SMC_KFMT/SMC_KVAL(), to
avoid further lengthening already-long printk lines.

- Hector