pinctrl/nomadik: document Alt-C glitch

This documentation comment existed in an earlier patch set for
GPIO consolidation, so I'm saving it for maintainability of the
code.

Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/pinctrl-nomadik.c b/drivers/pinctrl/pinctrl-nomadik.c
index e8937e7..3e7e47d 100644 (file)
--- a/drivers/pinctrl/pinctrl-nomadik.c
+++ b/drivers/pinctrl/pinctrl-nomadik.c
@@ -1438,7 +1438,27 @@ static int nmk_pmx_enable(struct pinctrl_dev *pctldev, unsigned function,
 
        dev_dbg(npct->dev, "enable group %s, %u pins\n", g->name, g->npins);
 
-       /* Handle this special glitch on altfunction C */
+       /*
+        * If we're setting altfunc C by setting both AFSLA and AFSLB to 1,
+        * we may pass through an undesired state. In this case we take
+        * some extra care.
+        *
+        * Safe sequence used to switch IOs between GPIO and Alternate-C mode:
+        *  - Save SLPM registers (since we have a shadow register in the
+        *    nmk_chip we're using that as backup)
+        *  - Set SLPM=0 for the IOs you want to switch and others to 1
+        *  - Configure the GPIO registers for the IOs that are being switched
+        *  - Set IOFORCE=1
+        *  - Modify the AFLSA/B registers for the IOs that are being switched
+        *  - Set IOFORCE=0
+        *  - Restore SLPM registers
+        *  - Any spurious wake up event during switch sequence to be ignored
+        *    and cleared
+        *
+        * We REALLY need to save ALL slpm registers, because the external
+        * IOFORCE will switch *all* ports to their sleepmode setting to as
+        * to avoid glitches. (Not just one port!)
+        */
        glitch = (g->altsetting == NMK_GPIO_ALT_C);
 
        if (glitch) {