[PATCH 05/33] gpio: add generic single-register fixed-direction GPIO driver

[Robert Jarzmik]

Russell King - ARM Linux <linux at armlinux.org.uk> writes:

> On Thu, Sep 01, 2016 at 09:19:13AM +0200, Robert Jarzmik wrote:
> It looks like:
>
> (a) pcmcia_probe() in drivers/pcmcia/sa1111_generic.c doesn't check the
>     return value from the platform specific init functions, meaning if
>     they fail, the driver still binds.  (note: they return -ENODEV to
>     indicate that they should skip to the next platform.)
You're right, I submitted a patch for that, and I confirm it actually happens on
lubbock.

> (b) there is no clock provided for the sa1111 pcmcia device (aka "1800").
>     This should be the same clock as pxa2xx-pcmcia.
Again right in the spot.
I added temporarily a clock until I have a more complete understanding in
lubbock.c :
+	clk_add_alias(NULL, "1800", "SA1111_CLK", NULL);

With this, things look way better :
[    1.507480] pcmcia_socket pcmcia_socket1: pccard: PCMCIA card inserted into slot 1

I'm still investigating the new message errors:
[    0.479157] genirq: Setting trigger mode 3 for irq 387 failed (sa1111_type_highirq+0x0/0x6c)
[    0.488213] genirq: Setting trigger mode 3 for irq 389 failed (sa1111_type_highirq+0x0/0x6c)
[    0.507449] genirq: Setting trigger mode 3 for irq 388 failed (sa1111_type_highirq+0x0/0x6c)
[    0.516492] genirq: Setting trigger mode 3 for irq 390 failed (sa1111_type_highirq+0x0/0x6c)

Moreover, I have a bit of homework as I also see :
 - no SA1111 interrupts at all, especially nothing when I insert/remove my
   CompactFlash card
   This might be an effect of pxa_cplds_irqs.c I created, I must have a look.
 - cat /sys/class/pcmcia_socket/pcmcia_socket1/cis 
   cat: read error: Input/output error
   That will cost me a review of the memory timings registers MCIO1/MECR/xxx,
   the power lines, etc ...
 - cat /sys/class/pcmcia_socket/pcmcia_socket1/status 
slot     : 1
status   : SS_READY SS_DETECT SS_POWERON SS_3VCARD
csc_mask : SS_DETECT
cs_flags : SS_OUTPUT_ENA
Vcc      : 33
Vpp      : 33
IRQ      : 0 (386)

>> As your gpios are contiguous (0 .. 31), why an array instead of a simple offset
>> so that your translation is only a linear irq = gpio + offset ?
>
> There isn't a linear translation here:
...zip...
> MST_PCMCIA_nCD		=> MAINSTONE_S0_CD_IRQ or MAINSTONE_S1_CD_IRQ
> MST_PCMCIA_nSTSCHG_BVD1 => MAINSTONE_S0_STSCHG_IRQ or MAINSTONE_S1_STSCHG_IRQ
> MST_PCMCIA_nIRQ		=> MAINSTONE_S0_IRQ or MAINSTONE_S1_IRQ
>
> So they aren't linear, and every "gpio" doesn't have a corresponding
> interrupt.
Ah yes, too bad, it would have been so much simpler.

Cheers.

-- 
Robert