target/linux/lantiq/patches-3.8/0014-PINCTRL-lantiq-fix-pin-availability-check.patch

   1 From 51d5029bd9cd0ff85e1df87a4df57e544c52dc34 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Wed, 30 Jan 2013 20:16:22 +0100
   4 Subject: [PATCH 14/40] PINCTRL: lantiq: fix pin availability check
   5
   6 The clock needs to be activated for the check to work. In order to be compatible
   7 with future silicon make sure that at least 1 pin is available before probing
   8 the pad controller.
   9
  10 Signed-off-by: Thomas Langer <thomas.langer@lantiq.com>
  11 Signed-off-by: John Crispin <blogic@openwrt.org>
  12 ---
  13  drivers/pinctrl/pinctrl-falcon.c |   11 ++++++++---
  14  1 file changed, 8 insertions(+), 3 deletions(-)
  15
  16 --- a/drivers/pinctrl/pinctrl-falcon.c
  17 +++ b/drivers/pinctrl/pinctrl-falcon.c
  18 @@ -455,12 +455,17 @@ static int pinctrl_falcon_probe(struct p
  19                                 *bank);
  20                         return -ENOMEM;
  21                 }
  22 +               clk_activate(falcon_info.clk[*bank]);
  23                 avail = pad_r32(falcon_info.membase[*bank],
  24                                         LTQ_PADC_AVAIL);
  25                 pins = fls(avail);
  26 -               lantiq_load_pin_desc(&falcon_pads[pad_count], *bank, pins);
  27 -               pad_count += pins;
  28 -               clk_enable(falcon_info.clk[*bank]);
  29 +               if (pins) {
  30 +                       lantiq_load_pin_desc(&falcon_pads[pad_count],
  31 +                                                               *bank, pins);
  32 +                       pad_count += pins;
  33 +               } else {
  34 +                       clk_deactivate(falcon_info.clk[*bank]);
  35 +               }
  36                 dev_dbg(&pdev->dev, "found %s with %d pads\n",
  37                                 res.name, pins);
  38         }