| Message ID | 20201210212534.216197-1-krzk@kernel.org |
|---|---|
| State | Accepted |
| Commit | 46799802136670e00498f19898f1635fbc85f583 |
| Headers | show |
| Series | [01/18] ARM: dts: exynos: correct fuel gauge interrupt trigger level on GT-I9100 | expand |
On 12/11/20 9:47 AM, Krzysztof Kozlowski wrote: > On Thu, Dec 10, 2020 at 10:25:34PM +0100, Krzysztof Kozlowski wrote: >> Interrupt line can be configured on different hardware in different way, >> even inverted. Therefore driver should not enforce specific trigger >> type - edge falling - but instead rely on Devicetree to configure it. >> >> The Maxim 14577/77836 datasheets describe the interrupt line as active >> low with a requirement of acknowledge from the CPU therefore the edge >> falling is not correct. >> >> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> >> >> --- >> >> This patch should wait till DTS changes are merged, as it relies on >> proper Devicetree. >> --- >> .../devicetree/bindings/power/supply/max17040_battery.txt | 2 +- >> drivers/power/supply/max17040_battery.c | 2 +- >> 2 files changed, 2 insertions(+), 2 deletions(-) >> >> diff --git a/Documentation/devicetree/bindings/power/supply/max17040_battery.txt b/Documentation/devicetree/bindings/power/supply/max17040_battery.txt >> index c802f664b508..194eb9fe574d 100644 >> --- a/Documentation/devicetree/bindings/power/supply/max17040_battery.txt >> +++ b/Documentation/devicetree/bindings/power/supply/max17040_battery.txt >> @@ -39,7 +39,7 @@ Example: >> reg = <0x36>; >> maxim,alert-low-soc-level = <10>; >> interrupt-parent = <&gpio7>; >> - interrupts = <2 IRQ_TYPE_EDGE_FALLING>; >> + interrupts = <2 IRQ_TYPE_LEVEL_LOW>; >> wakeup-source; >> }; >> >> diff --git a/drivers/power/supply/max17040_battery.c b/drivers/power/supply/max17040_battery.c >> index d956c67d5155..f737de0470de 100644 >> --- a/drivers/power/supply/max17040_battery.c >> +++ b/drivers/power/supply/max17040_battery.c >> @@ -367,7 +367,7 @@ static int max17040_enable_alert_irq(struct max17040_chip *chip) >> >> flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT; > > This has to be removed. I will fix it in v2. > > Best regards, > Krzysztof I removed the IRQF_TRIGGER_FALLING, tweaked the DT as per the DT patch, and it worked on the samsung klte. I don't understand how the DT irq flag ends up being used by the kernel. It is never explicitly read from DT or passed to interrupt API, only i2c->irq, which is a pure int. Fixing the DT and the drivers will hopefully set a precedent, so future drivers (when copied/tweaked from existing drivers) will do it right. Acked-by: Iskren Chernev <iskren.chernev@gmail.com> >> ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, >> - max17040_thread_handler, flags, >> + max17040_thread_handler, IRQF_ONESHOT, >> chip->battery->desc->name, chip); >> >> return ret; >> -- >> 2.25.1 >>
On Thu, Dec 10, 2020 at 10:25:17PM +0100, Krzysztof Kozlowski wrote: > The Maxim fuel gauge datasheets describe the interrupt line as active > low with a requirement of acknowledge from the CPU. The falling edge > interrupt will mostly work but it's not correct. > > Fixes: 8620cc2f99b7 ("ARM: dts: exynos: Add devicetree file for the Galaxy S2") > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> > --- > arch/arm/boot/dts/exynos4210-i9100.dts | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > Applied 1-10 (Exynos and S5P dts patches). Best regards, Krzysztof
diff --git a/arch/arm/boot/dts/exynos4210-i9100.dts b/arch/arm/boot/dts/exynos4210-i9100.dts index a0c3bab382ae..e56b64e237d3 100644 --- a/arch/arm/boot/dts/exynos4210-i9100.dts +++ b/arch/arm/boot/dts/exynos4210-i9100.dts @@ -136,7 +136,7 @@ battery@36 { compatible = "maxim,max17042"; interrupt-parent = <&gpx2>; - interrupts = <3 IRQ_TYPE_EDGE_FALLING>; + interrupts = <3 IRQ_TYPE_LEVEL_LOW>; pinctrl-0 = <&max17042_fuel_irq>; pinctrl-names = "default";
The Maxim fuel gauge datasheets describe the interrupt line as active low with a requirement of acknowledge from the CPU. The falling edge interrupt will mostly work but it's not correct. Fixes: 8620cc2f99b7 ("ARM: dts: exynos: Add devicetree file for the Galaxy S2") Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> --- arch/arm/boot/dts/exynos4210-i9100.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)