diff mbox series

[5/5] arm64: dts: qcom: msm8916-samsung-a2015: Add NFC

Message ID 20210604172742.10593-5-stephan@gerhold.net
State Accepted
Commit 5e57e5d0d62216502ce603f3399e411368e11a43
Headers show
Series [1/5] arm64: dts: qcom: msm8916-samsung-a2015: Add touch key | expand

Commit Message

Stephan Gerhold June 4, 2021, 5:27 p.m. UTC
The Samsung Galaxy A3/A5 both have a Samsung S3FWRN5 NFC chip that
works quite well with the s3fwrn5 driver in the Linux NFC subsystem.

The clock setup for the NFC chip is a bit special (although this
seems to be a common approach used for Qualcomm devices with NFC):

The NFC chip has an output GPIO that is asserted whenever the clock
is needed to function properly. On the A3/A5 this is wired up to
PM8916 GPIO2, which is then configured with a special function
(NFC_CLK_REQ or BB_CLK2_REQ).

Enabling the rpmcc RPM_SMD_BB_CLK2_PIN clock will then instruct
PM8916 to automatically enable the clock whenever the NFC chip
requests it. The advantage is that the clock is only enabled when
needed and we don't need to manage it ourselves from the NFC driver.

Note that for some reason Samsung decided to connect the I2C pins
to GPIOs where no hardware I2C bus is available, so we need to
fall back to software bit-banging with i2c-gpio.

Cc: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
---
 .../qcom/msm8916-samsung-a2015-common.dtsi    | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)

Comments

Krzysztof Kozlowski June 7, 2021, 8:23 a.m. UTC | #1
On 04/06/2021 19:27, Stephan Gerhold wrote:
> The Samsung Galaxy A3/A5 both have a Samsung S3FWRN5 NFC chip that
> works quite well with the s3fwrn5 driver in the Linux NFC subsystem.
> 
> The clock setup for the NFC chip is a bit special (although this
> seems to be a common approach used for Qualcomm devices with NFC):
> 
> The NFC chip has an output GPIO that is asserted whenever the clock
> is needed to function properly. On the A3/A5 this is wired up to
> PM8916 GPIO2, which is then configured with a special function
> (NFC_CLK_REQ or BB_CLK2_REQ).
> 
> Enabling the rpmcc RPM_SMD_BB_CLK2_PIN clock will then instruct
> PM8916 to automatically enable the clock whenever the NFC chip
> requests it. The advantage is that the clock is only enabled when
> needed and we don't need to manage it ourselves from the NFC driver.
> 
> Note that for some reason Samsung decided to connect the I2C pins
> to GPIOs where no hardware I2C bus is available, so we need to
> fall back to software bit-banging with i2c-gpio.
> 
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
> ---
>  .../qcom/msm8916-samsung-a2015-common.dtsi    | 64 +++++++++++++++++++
>  1 file changed, 64 insertions(+)
> 


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>


Best regards,
Krzysztof
diff mbox series

Patch

diff --git a/arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi b/arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi
index 9a6988ded29d..9b4b7de7cec2 100644
--- a/arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi
@@ -4,6 +4,7 @@ 
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/input/input.h>
 #include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
 
 / {
 	aliases {
@@ -124,6 +125,34 @@  touchkey: touchkey@20 {
 			pinctrl-0 = <&tkey_default>;
 		};
 	};
+
+	i2c-nfc {
+		compatible = "i2c-gpio";
+		sda-gpios = <&msmgpio 0 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&msmgpio 1 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&nfc_i2c_default>;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		nfc@27 {
+			compatible = "samsung,s3fwrn5-i2c";
+			reg = <0x27>;
+
+			interrupt-parent = <&msmgpio>;
+			interrupts = <21 IRQ_TYPE_EDGE_RISING>;
+
+			en-gpios = <&msmgpio 20 GPIO_ACTIVE_HIGH>;
+			wake-gpios = <&msmgpio 49 GPIO_ACTIVE_HIGH>;
+
+			clocks = <&rpmcc RPM_SMD_BB_CLK2_PIN>;
+
+			pinctrl-names = "default";
+			pinctrl-0 = <&nfc_default &nfc_clk_req>;
+		};
+	};
 };
 
 &blsp_i2c2 {
@@ -384,6 +413,30 @@  muic_int_default: muic-int-default {
 		bias-disable;
 	};
 
+	nfc_default: nfc-default {
+		pins = "gpio20", "gpio49";
+		function = "gpio";
+
+		drive-strength = <2>;
+		bias-disable;
+
+		irq {
+			pins = "gpio21";
+			function = "gpio";
+
+			drive-strength = <2>;
+			bias-pull-down;
+		};
+	};
+
+	nfc_i2c_default: nfc-i2c-default {
+		pins = "gpio0", "gpio1";
+		function = "gpio";
+
+		drive-strength = <2>;
+		bias-disable;
+	};
+
 	tkey_default: tkey-default {
 		pins = "gpio98";
 		function = "gpio";
@@ -408,3 +461,14 @@  tsp_en_default: tsp-en-default {
 		bias-disable;
 	};
 };
+
+&pm8916_gpios {
+	nfc_clk_req: nfc-clk-req {
+		pins = "gpio2";
+		function = "func1";
+
+		input-enable;
+		bias-disable;
+		power-source = <PM8916_GPIO_L2>;
+	};
+};