target/linux/mediatek/patches-5.15/920-v5.16-watchdog-mtk-add-disable_wdt_extrst-support.patch

   1 From 59b0f51335644ee603260faaa4298c0115fb7187 Mon Sep 17 00:00:00 2001
   2 From: Fengquan Chen <Fengquan.Chen@mediatek.com>
   3 Date: Tue, 14 Sep 2021 20:34:54 +0800
   4 Subject: [PATCH] watchdog: mtk: add disable_wdt_extrst support
   5
   6 In some cases, we may need watchdog just to trigger an
   7 internal soc reset without sending any output signal.
   8
   9 Provide a disable_wdt_extrst parameter for configuration.
  10 We can disable or enable it just by configuring dts.
  11
  12 Signed-off-by: Fengquan Chen <fengquan.chen@mediatek.com>
  13 Reviewed-by: Guenter Roeck <linux@roeck-us.net>
  14 Link: https://lore.kernel.org/r/20210914123454.32603-3-Fengquan.Chen@mediatek.com
  15 Signed-off-by: Guenter Roeck <linux@roeck-us.net>
  16 Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
  17 ---
  18  drivers/watchdog/mtk_wdt.c | 7 +++++++
  19  1 file changed, 7 insertions(+)
  20
  21 --- a/drivers/watchdog/mtk_wdt.c
  22 +++ b/drivers/watchdog/mtk_wdt.c
  23 @@ -65,6 +65,7 @@ struct mtk_wdt_dev {
  24         void __iomem *wdt_base;
  25         spinlock_t lock; /* protects WDT_SWSYSRST reg */
  26         struct reset_controller_dev rcdev;
  27 +       bool disable_wdt_extrst;
  28  };
  29
  30  struct mtk_wdt_data {
  31 @@ -256,6 +257,8 @@ static int mtk_wdt_start(struct watchdog
  32                 reg |= (WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN);
  33         else
  34                 reg &= ~(WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN);
  35 +       if (mtk_wdt->disable_wdt_extrst)
  36 +               reg &= ~WDT_MODE_EXRST_EN;
  37         reg |= (WDT_MODE_EN | WDT_MODE_KEY);
  38         iowrite32(reg, wdt_base + WDT_MODE);
  39
  40 @@ -381,6 +384,10 @@ static int mtk_wdt_probe(struct platform
  41                 if (err)
  42                         return err;
  43         }
  44 +
  45 +       mtk_wdt->disable_wdt_extrst =
  46 +               of_property_read_bool(dev->of_node, "mediatek,disable-extrst");
  47 +
  48         return 0;
  49  }
  50