target/linux/ath79/patches-6.6/820-mfd-syscon-support-skip-reset-control-for-syscon-devices.patch

   1 From: Shiji Yang <yangshiji66@outlook.com>
   2 Date: Wed, 13 Mar 2024 22:36:31 +0800
   3 Subject: [PATCH] mfd: syscon: support skip reset control for syscon devices
   4
   5 Some platform device drivers(e.g. ag71xx) expect exclusive reset
   6 control. Fetching reset controller for syscon[1] will break these
   7 drivers. This patch introduces a new property 'syscon-no-reset'
   8 to skip it.
   9
  10 [1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit?id=7d1e3bd94828ad9fc86f55253cd6fec8edd65394
  11
  12 Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
  13 ---
  14  drivers/mfd/syscon.c | 5 +++--
  15  1 file changed, 3 insertions(+), 2 deletions(-)
  16
  17 --- a/drivers/mfd/syscon.c
  18 +++ b/drivers/mfd/syscon.c
  19 @@ -52,7 +52,7 @@ static struct syscon *of_syscon_register
  20         int ret;
  21         struct regmap_config syscon_config = syscon_regmap_config;
  22         struct resource res;
  23 -       struct reset_control *reset;
  24 +       struct reset_control *reset = NULL;
  25
  26         syscon = kzalloc(sizeof(*syscon), GFP_KERNEL);
  27         if (!syscon)
  28 @@ -134,7 +134,8 @@ static struct syscon *of_syscon_register
  29                                 goto err_attach_clk;
  30                 }
  31
  32 -               reset = of_reset_control_get_optional_exclusive(np, NULL);
  33 +               if (!of_property_read_bool(np, "syscon-no-reset"))
  34 +                       reset = of_reset_control_get_optional_exclusive(np, NULL);
  35                 if (IS_ERR(reset)) {
  36                         ret = PTR_ERR(reset);
  37                         goto err_attach_clk;