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watchdog: cmsdk_apb: only support a single channel

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The CMSDK watchdog hardware only supports a single timeout channel.
Return the documented error if more than one timeout is requested to be
installed.

Signed-off-by: Jordan Yates <jordan@embeint.com>
This commit is contained in:
Jordan Yates 2024-07-05 13:38:59 +10:00 committed by Alberto Escolar
parent 9138763430
commit 063d2ff6ec
1 changed files with 7 additions and 0 deletions
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7
drivers/watchdog/wdt_cmsdk_apb.c
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@ -67,6 +67,7 @@ const struct device *wdog_r;
/* watchdog reload value in clock cycles */
static unsigned int reload_cycles = CMSDK_APB_WDOG_RELOAD;
static uint8_t assigned_channels;
static uint8_t flags;
static void (*user_cb)(const struct device *dev, int channel_id);
@ -102,6 +103,8 @@ static int wdog_cmsdk_apb_disable(const struct device *dev)
/* Stop the watchdog counter with INTEN bit */
wdog->ctrl = ~(CMSDK_APB_WDOG_CTRL_RESEN | CMSDK_APB_WDOG_CTRL_INTEN);
assigned_channels = 0;
return 0;
}
@ -116,6 +119,9 @@ static int wdog_cmsdk_apb_install_timeout(const struct device *dev,
if (config->window.max == 0) {
return -EINVAL;
}
if (assigned_channels == 1) {
return -ENOMEM;
}
/* Reload value */
reload_cycles = config->window.max * clk_freq_khz;
@ -126,6 +132,7 @@ static int wdog_cmsdk_apb_install_timeout(const struct device *dev,
/* Configure only the callback */
user_cb = config->callback;
assigned_channels++;
return 0;
}