* Vaibhav Hiremath [off-list ref] [150706 05:05]:

On Monday 06 July 2015 12:05 PM, Tony Lindgren wrote:

quoted

Sorry this won't work. Most platforms don't need regmap here, and I
certainly don't want to use regmap for toggling pins for runtime
PM because of the extra overhead.

That's exactly my question was in my first email. It's ok.

What is your openion on overall code changes for regmap support ?
Any other feedback or suggestions?

Seems it should work just fine once you get the IO functions
configured :)
 

quoted

It seems you need to stash the regmap pointer to struct pcs_device
and just the function pointers. As this driver is ioremapping the
region, we certainly want to keep things using void __iomem * too.
You can cast that to whatever regmap needs in the wrapper functions
for regmap. Note that the extra overhead there won't matter as we
are using regmap mostly for devices over I2C and so on.

The issue I have here with the signature of read/write fn

static unsigned __maybe_unused pcs_read(void __iomem *reg)
static void __maybe_unused pcs_writeX(unsigned val, void __iomem *reg)


For regmap, I need 2 arguments,

1. Pointer to regmap
2. Offset to register


So I will have to change the signature to

static unsigned __maybe_unused pcs_read(void __iomem *reg, unsigned int
offset)
static void __maybe_unused pcs_write(void __iomem *reg, unsigned val,
unsigned int offset)


And,
On the same direction, will having separate functions for regmap.

static unsigned pcs_read_regmap(void __iomem *reg, unsigned int offset)
{
	unsigned int val;

	regmap_read((struct regmap *)reg, offset, &val);
}

static void pcs_write_regmap(void __iomem *reg, unsigned val, unsigned int
offset)
{
       regmap_write((struct regmap *)reg, offset, val);
 }

OK yeah that should work.
 

This functions will be initialized to pcs_device->read/write.

I will have to do some more changes, specially around pcs_interrupt
usage.

OK I suggest a separate patch to add support for interrupts.

Regards,

Tony