On Saturday 12 September 2015 12:36 AM, Wolfram Sang wrote:
On Mon, Aug 24, 2015 at 11:29:36AM +0530, Vaibhav Hiremath wrote:
TWSI_ILCR & TWSI_IWCR registers are used to adjust clock rate
of standard & fast mode in pxa910/988; so this patch adds these two new
entries to "struct pxa_reg_layout" and "struct pxa_i2c".
As discussed in the previous patch-series, the idea here is to add standard
DT properties for ilcr and iwcr configuration fields.
In case of Master ilcr is used for low/high time and in case of slave mode
of operation iwcr is used for setup/hold time.
I need to rethink how to describe i2c bus timing parameters in DT in the
next days. But this is planned for 4.4., promised.
One thing I already wonder about this one...
static const struct platform_device_id i2c_pxa_id_table[] = {
{ "pxa2xx-i2c", REGS_PXA2XX },
{ "pxa3xx-pwri2c", REGS_PXA3XX },
{ "ce4100-i2c", REGS_CE4100 },
+ { "pxa910-i2c", REGS_PXA910 },
{ },
You add a new platform_id...
@@ -1135,7 +1170,7 @@ static const struct i2c_algorithm i2c_pxa_pio_algorithm = {
static const struct of_device_id i2c_pxa_dt_ids[] = {
{ .compatible = "mrvl,pxa-i2c", .data = (void *)REGS_PXA2XX },
{ .compatible = "mrvl,pwri2c", .data = (void *)REGS_PXA3XX },
- { .compatible = "mrvl,mmp-twsi", .data = (void *)REGS_PXA2XX },
+ { .compatible = "mrvl,mmp-twsi", .data = (void *)REGS_PXA910 },
{}
...but change the compatible binding instead of adding a new one?
Yes, because the offset for both REGS_PXA2XX and REGS_PXA910 are same,
and for REGS_PXA2XX we already have compatible entry "mrvl,pxa-i2c".
And the i2c binding documentation, which says,
for platforms using REGS_PXA2XX, they need to provide additional node
"mrvl,pxa-i2c". Which is confusing :)
Also, when I did git-blame on the driver file to see why "mmp-twsi"
entry has been added without anyone really using it. But I did not find
anything meaningful.
So, from the code it was very clear that, "mmp-twsi" and "pxa-i2c" both
are same, its the code which I am adding here brings difference between
them.
I tried to find datasheet for the platforms using "mmp-twsi", but was
unlucky.
Thanks,
Vaibhav
Thanks,
Vaibhav
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