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watchdog: mt7621-wdt: avoid ralink architecture dependent code 

MT7621 SoC has a system controller node. Watchdog need to access to reset
status register. Ralink architecture and related driver are old and from
the beggining they are using some architecture dependent operations for
accessing this shared registers through 'asm/mach-ralink/ralink_regs.h'
header file. However this is not ideal from a driver perspective which can
just access to the system controller registers in an arch independent way
using regmap syscon APIs. Update Kconfig accordingly to select new added
dependencies and allow driver to be compile tested.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230214103936.1061078-6-sergio.paracuellos@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Sergio Paracuellos 2023-02-14 11:39:36 +01:00 committed by Wim Van Sebroeck
parent 783c7cb465
commit ff8ec4ac39
2 changed files with 20 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/watchdog/Kconfig
View File

@ -1872,7 +1872,9 @@ config GXP_WATCHDOG
config MT7621_WDT
tristate "Mediatek SoC watchdog"
select WATCHDOG_CORE
depends on SOC_MT7620 || SOC_MT7621
select REGMAP_MMIO
select MFD_SYSCON
depends on SOC_MT7620 || SOC_MT7621 || COMPILE_TEST
help
Hardware driver for the Mediatek/Ralink MT7621/8 SoC Watchdog Timer.

22
drivers/watchdog/mt7621_wdt.c
View File

@ -15,8 +15,8 @@
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/mod_devicetable.h>
#include <asm/mach-ralink/ralink_regs.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#define SYSC_RSTSTAT 0x38
#define WDT_RST_CAUSE BIT(1)
@ -34,6 +34,7 @@
struct mt7621_wdt_data {
void __iomem *base;
struct reset_control *rst;
struct regmap *sysc;
struct watchdog_device wdt;
};
@ -104,9 +105,12 @@ static int mt7621_wdt_stop(struct watchdog_device *w)
return 0;
}
static int mt7621_wdt_bootcause(void)
static int mt7621_wdt_bootcause(struct mt7621_wdt_data *d)
{
if (rt_sysc_r32(SYSC_RSTSTAT) & WDT_RST_CAUSE)
u32 val;
regmap_read(d->sysc, SYSC_RSTSTAT, &val);
if (val & WDT_RST_CAUSE)
return WDIOF_CARDRESET;
return 0;
@ -134,6 +138,7 @@ static const struct watchdog_ops mt7621_wdt_ops = {
static int mt7621_wdt_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
struct watchdog_device *mt7621_wdt;
struct mt7621_wdt_data *drvdata;
@ -143,6 +148,13 @@ static int mt7621_wdt_probe(struct platform_device *pdev)
if (!drvdata)
return -ENOMEM;
drvdata->sysc = syscon_regmap_lookup_by_phandle(np, "mediatek,sysctl");
if (IS_ERR(drvdata->sysc)) {
drvdata->sysc = syscon_regmap_lookup_by_compatible("mediatek,mt7621-sysc");
if (IS_ERR(drvdata->sysc))
return PTR_ERR(drvdata->sysc);
}
drvdata->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(drvdata->base))
return PTR_ERR(drvdata->base);
@ -158,7 +170,7 @@ static int mt7621_wdt_probe(struct platform_device *pdev)
mt7621_wdt->max_timeout = 0xfffful / 1000;
mt7621_wdt->parent = dev;
mt7621_wdt->bootstatus = mt7621_wdt_bootcause();
mt7621_wdt->bootstatus = mt7621_wdt_bootcause(drvdata);
watchdog_init_timeout(mt7621_wdt, mt7621_wdt->max_timeout, dev);
watchdog_set_nowayout(mt7621_wdt, nowayout);