diff options
author | Maxime Ripard <mripard@kernel.org> | 2023-11-15 12:45:19 +0300 |
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committer | Maxime Ripard <mripard@kernel.org> | 2023-11-15 12:56:44 +0300 |
commit | 3bf3e21c15d4386a5f15118ec39bbc1b67ea5759 (patch) | |
tree | a8880bb7b152d913ebd86e7cd858600dbe22ed38 /drivers/watchdog/ixp4xx_wdt.c | |
parent | 34b98a5f7a185c19715cc98c57d7e27b4785dfdf (diff) | |
parent | b85ea95d086471afb4ad062012a4d73cd328fa86 (diff) | |
download | linux-3bf3e21c15d4386a5f15118ec39bbc1b67ea5759.tar.xz |
Merge drm/drm-next into drm-misc-next
Let's kickstart the v6.8 release cycle.
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Diffstat (limited to 'drivers/watchdog/ixp4xx_wdt.c')
-rw-r--r-- | drivers/watchdog/ixp4xx_wdt.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/drivers/watchdog/ixp4xx_wdt.c b/drivers/watchdog/ixp4xx_wdt.c index 607ce4b8df57..ec0c08652ec2 100644 --- a/drivers/watchdog/ixp4xx_wdt.c +++ b/drivers/watchdog/ixp4xx_wdt.c @@ -105,6 +105,25 @@ static const struct watchdog_ops ixp4xx_wdt_ops = { .owner = THIS_MODULE, }; +/* + * The A0 version of the IXP422 had a bug in the watchdog making + * is useless, but we still need to use it to restart the system + * as it is the only way, so in this special case we register a + * "dummy" watchdog that doesn't really work, but will support + * the restart operation. + */ +static int ixp4xx_wdt_dummy(struct watchdog_device *wdd) +{ + return 0; +} + +static const struct watchdog_ops ixp4xx_wdt_restart_only_ops = { + .start = ixp4xx_wdt_dummy, + .stop = ixp4xx_wdt_dummy, + .restart = ixp4xx_wdt_restart, + .owner = THIS_MODULE, +}; + static const struct watchdog_info ixp4xx_wdt_info = { .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE @@ -114,14 +133,17 @@ static const struct watchdog_info ixp4xx_wdt_info = { static int ixp4xx_wdt_probe(struct platform_device *pdev) { + static const struct watchdog_ops *iwdt_ops; struct device *dev = &pdev->dev; struct ixp4xx_wdt *iwdt; struct clk *clk; int ret; if (!(read_cpuid_id() & 0xf) && !cpu_is_ixp46x()) { - dev_err(dev, "Rev. A0 IXP42x CPU detected - watchdog disabled\n"); - return -ENODEV; + dev_info(dev, "Rev. A0 IXP42x CPU detected - only restart supported\n"); + iwdt_ops = &ixp4xx_wdt_restart_only_ops; + } else { + iwdt_ops = &ixp4xx_wdt_ops; } iwdt = devm_kzalloc(dev, sizeof(*iwdt), GFP_KERNEL); @@ -141,7 +163,7 @@ static int ixp4xx_wdt_probe(struct platform_device *pdev) iwdt->rate = IXP4XX_TIMER_FREQ; iwdt->wdd.info = &ixp4xx_wdt_info; - iwdt->wdd.ops = &ixp4xx_wdt_ops; + iwdt->wdd.ops = iwdt_ops; iwdt->wdd.min_timeout = 1; iwdt->wdd.max_timeout = U32_MAX / iwdt->rate; iwdt->wdd.parent = dev; |