| Message ID | 20220929011557.4165216-3-dmitry.torokhov@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [1/3] arm64: dts: exynos: fix polarity of "enable" line of NFC chip | expand |
diff --git a/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml b/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml index 64995cbb0f97..78e3c13f1acb 100644 --- a/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml +++ b/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml @@ -81,7 +81,7 @@ examples: interrupt-parent = <&gpa1>; interrupts = <3 IRQ_TYPE_EDGE_RISING>; - en-gpios = <&gpf1 4 GPIO_ACTIVE_HIGH>; + en-gpios = <&gpf1 4 GPIO_ACTIVE_LOW>; wake-gpios = <&gpj0 2 GPIO_ACTIVE_HIGH>; clocks = <&rpmcc 20>; @@ -93,7 +93,7 @@ examples: nfc { compatible = "samsung,s3fwrn82"; - en-gpios = <&gpio 20 GPIO_ACTIVE_HIGH>; + en-gpios = <&gpio 20 GPIO_ACTIVE_LOW>; wake-gpios = <&gpio 16 GPIO_ACTIVE_HIGH>; };
According to s3fwrn5 driver code the "enable" GPIO line is driven "high" when chip is not in use (mode is S3FWRN5_MODE_COLD), and is driven "low" when chip is in use. s3fwrn5_phy_power_ctrl(): ... gpio_set_value(phy->gpio_en, 1); ... if (mode != S3FWRN5_MODE_COLD) { msleep(S3FWRN5_EN_WAIT_TIME); gpio_set_value(phy->gpio_en, 0); msleep(S3FWRN5_EN_WAIT_TIME); } Therefore the line described by "en-gpios" property should be annotated as "active low". The wakeup gpio appears to have correct polarity (active high). Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> --- .../devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)