On 2/14/23 00:31, Krzysztof Kozlowski wrote:
On 13/02/2023 21:05, Sergio Paracuellos wrote:
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@xxxxxxxxx>
---
drivers/watchdog/Kconfig | 4 +++-
drivers/watchdog/mt7621_wdt.c | 18 +++++++++++++-----
2 files changed, 16 insertions(+), 6 deletions(-)
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index b64bc49c7..cf752ad64 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1865,7 +1865,9 @@ 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.
diff --git a/drivers/watchdog/mt7621_wdt.c b/drivers/watchdog/mt7621_wdt.c
index 40fb2c9ba..22e979bdd 100644
--- a/drivers/watchdog/mt7621_wdt.c
+++ b/drivers/watchdog/mt7621_wdt.c
@@ -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;
@@ -143,6 +147,10 @@ static int mt7621_wdt_probe(struct platform_device *pdev)
if (!drvdata)
return -ENOMEM;
+ drvdata->sysc = syscon_regmap_lookup_by_compatible("mediatek,mt7621-sysc");
+ if (IS_ERR(drvdata->sysc))
+ return PTR_ERR(drvdata->sysc);
This should be the backup/error path for original code using syscon
property. Looking up by compatible is really not portable/re-usable.
I really disagree here.
$ git grep syscon_regmap_lookup_by_compatible | wc
90 326 8940
I have not yet reviewed this code, but I do not accept this argument against it.
Guenter
