unimore/kernel-hacking-2024-linux-steffo
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watchdog: npcm: Enable clock if provided

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On the Nuvoton WPCM450 SoC, with its upcoming clock driver, peripheral
clocks are individually gated and ungated. Therefore, the watchdog
driver must be able to ungate the watchdog clock.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220610072141.347795-3-j.neuschaefer@gmx.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Jonathan Neuschäfer 2022-06-10 09:21:37 +02:00 committed by Wim Van Sebroeck
parent 6adbfbab0f
commit af084fdccf
1 changed files with 16 additions and 0 deletions
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16
drivers/watchdog/npcm_wdt.c
View file

@ -3,6 +3,7 @@
// Copyright (c) 2018 IBM Corp.
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
@ -43,6 +44,7 @@
struct npcm_wdt {
struct watchdog_device wdd;
void __iomem *reg;
struct clk *clk;
};
static inline struct npcm_wdt *to_npcm_wdt(struct watchdog_device *wdd)
@ -66,6 +68,9 @@ static int npcm_wdt_start(struct watchdog_device *wdd)
struct npcm_wdt *wdt = to_npcm_wdt(wdd);
u32 val;
if (wdt->clk)
clk_prepare_enable(wdt->clk);
if (wdd->timeout < 2)
val = 0x800;
else if (wdd->timeout < 3)
@ -100,6 +105,9 @@ static int npcm_wdt_stop(struct watchdog_device *wdd)
writel(0, wdt->reg);
if (wdt->clk)
clk_disable_unprepare(wdt->clk);
return 0;
}
@ -147,6 +155,10 @@ static int npcm_wdt_restart(struct watchdog_device *wdd,
{
struct npcm_wdt *wdt = to_npcm_wdt(wdd);
/* For reset, we start the WDT clock and leave it running. */
if (wdt->clk)
clk_prepare_enable(wdt->clk);
writel(NPCM_WTR | NPCM_WTRE | NPCM_WTE, wdt->reg);
udelay(1000);
@ -191,6 +203,10 @@ static int npcm_wdt_probe(struct platform_device *pdev)
if (IS_ERR(wdt->reg))
return PTR_ERR(wdt->reg);
wdt->clk = devm_clk_get_optional(&pdev->dev, NULL);
if (IS_ERR(wdt->clk))
return PTR_ERR(wdt->clk);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;