ARM: dts: qcom: apq8060-dragonboard: Add TMA340 to APQ8060 DragonBoard

This adds the CY8CTMA340 Touchscreen to the APQ8060 DragonBoard.

Tested without display by issuing cat /dev/input/input/event3
which produces appropriate noise and interrupts on the dedicated
GPIO line.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220913132846.305716-3-linus.walleij@linaro.org

diff --git a/arch/arm/boot/dts/qcom-apq8060-dragonboard.dts b/arch/arm/boot/dts/qcom-apq8060-dragonboard.dts
index 70a1dd6..573e4dc 100644 (file)
--- a/arch/arm/boot/dts/qcom-apq8060-dragonboard.dts
+++ b/arch/arm/boot/dts/qcom-apq8060-dragonboard.dts
@@ -159,6 +159,19 @@
                                };
                        };
 
+                       dragon_gsbi3_i2c_pins: gsbi3_i2c {
+                               mux {
+                                       pins = "gpio43", "gpio44";
+                                       function = "gsbi3";
+                               };
+                               pinconf {
+                                       pins = "gpio43", "gpio44";
+                                       drive-strength = <8>;
+                                       /* These have external pull-up 2.2kOhm to 1.8V */
+                                       bias-disable;
+                               };
+                       };
+
                        dragon_gsbi8_i2c_pins: gsbi8_i2c {
                                mux {
                                        pins = "gpio64", "gpio65";
@@ -240,6 +253,22 @@
                                        bias-pull-up;
                                };
                        };
+
+                       dragon_tma340_gpios: tma340 {
+                               reset {
+                                       /* RESET line, TS_ATTN, WAKE_CTP */
+                                       pins = "gpio58";
+                                       function = "gpio";
+                                       drive-strength = <6>;
+                                       bias-disable;
+                               };
+                               irq {
+                                       pins = "gpio61"; /* IRQ line */
+                                       function = "gpio";
+                                       drive-strength = <2>;
+                                       bias-pull-up;
+                               };
+                       };
                };
 
                qcom,ssbi@500000 {
@@ -444,6 +473,45 @@
                        };
                };
 
+               gsbi@16200000 {
+                       qcom,mode = <GSBI_PROT_I2C>;
+                       status = "okay";
+
+                       gsbi3_i2c: i2c@16280000 {
+                               pinctrl-names = "default";
+                               pinctrl-0 = <&dragon_gsbi3_i2c_pins>;
+                               status = "okay";
+
+                               touchscreen@24 {
+                                       compatible = "cypress,cy8ctma340";
+                                       reg = <0x24>;
+                                       /* Certainly we can do at least 400 kHz */
+                                       clock-frequency = <400000>;
+                                       /* IRQ on GPIO61 called /CTP_INT */
+                                       interrupt-parent = <&tlmm>;
+                                       interrupts = <61 IRQ_TYPE_EDGE_FALLING>;
+                                       /*
+                                        * The I2C bus is using a PCA9306 level translator from L16A
+                                        * to L2B so these two voltages are needed and L16A is
+                                        * kind of the IO voltage, however L16Aisn't really fed to
+                                        * the TMA340, which relies entirely on L2B (PM8901 L2).
+                                        */
+                                       vcpin-supply = <&pm8058_l16>;
+                                       vdd-supply = <&pm8901_l2>;
+                                       /* GPIO58, called WAKE_CTP */
+                                       reset-gpios = <&tlmm 58 GPIO_ACTIVE_LOW>;
+                                       touchscreen-size-x = <480>;
+                                       touchscreen-size-y = <800>;
+                                       active-interval-ms = <0>;
+                                       touch-timeout-ms = <255>;
+                                       lowpower-interval-ms = <10>;
+                                       bootloader-key = /bits/ 8 <0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07>;
+                                       pinctrl-names = "default";
+                                       pinctrl-0 = <&dragon_tma340_gpios>;
+                               };
+                       };
+               };
+
                gsbi@19800000 {
                        status = "okay";
                        qcom,mode = <GSBI_PROT_I2C>;
@@ -634,7 +702,8 @@
                                        bias-pull-down;
                                };
                                l2 {
-                                       regulator-min-microvolt = <2850000>;
+                                       /* TMA340 requires strictly 3.3V */
+                                       regulator-min-microvolt = <3300000>;
                                        regulator-max-microvolt = <3300000>;
                                        bias-pull-down;
                                };