ARM64: dts: meson: meson-gx: add the SAR ADC

Add the SAR ADC to meson-gxbb.dtsi and meson-gxl.dtsi. GXBB provides a
10-bit ADC while GXL and GXM provide a 12-bit ADC.
Some boards use resistor ladder buttons connected through one of the ADC
channels. On newer devices (GXL and GXM) some boards use pull-ups/downs
to change the resistance (and thus the ADC value) on one of the ADC
channels to indicate the board revision.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

4 files changed, 32 insertions, 0 deletions

diff --git a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
index 9110dc1a2481..f100d0b013b4 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
@@ -237,6 +237,14 @@
                                 status = "disabled";
                         };
 
+                        saradc: adc@8680 {
+                                compatible = "amlogic,meson-saradc";
+                                reg = <0x0 0x8680 0x0 0x34>;
+                                #io-channel-cells = <1>;
+                                interrupts = <GIC_SPI 73 IRQ_TYPE_EDGE_RISING>;
+                                status = "disabled";
+                        };
+
                         pwm_ef: pwm@86c0 {
                                 compatible = "amlogic,meson-gx-pwm", "amlogic,meson-gxbb-pwm";
                                 reg = <0x0 0x086c0 0x0 0x10>;
diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
index 39a774ad83ce..04b3324bc132 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
@@ -490,6 +490,16 @@
         clocks = <&clkc CLKID_I2C>;
 };
 
+&saradc {
+        compatible = "amlogic,meson-gxbb-saradc", "amlogic,meson-saradc";
+        clocks = <&xtal>,
+                 <&clkc CLKID_SAR_ADC>,
+                 <&clkc CLKID_SANA>,
+                 <&clkc CLKID_SAR_ADC_CLK>,
+                 <&clkc CLKID_SAR_ADC_SEL>;
+        clock-names = "clkin", "core", "sana", "adc_clk", "adc_sel";
+};
+
 &sd_emmc_a {
         clocks = <&clkc CLKID_SD_EMMC_A>,
                  <&xtal>,
diff --git a/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
index 5f1100af72b1..fe11b5fc61f7 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
@@ -347,6 +347,16 @@
         clocks = <&clkc CLKID_I2C>;
 };
 
+&saradc {
+        compatible = "amlogic,meson-gxl-saradc", "amlogic,meson-saradc";
+        clocks = <&xtal>,
+                 <&clkc CLKID_SAR_ADC>,
+                 <&clkc CLKID_SANA>,
+                 <&clkc CLKID_SAR_ADC_CLK>,
+                 <&clkc CLKID_SAR_ADC_SEL>;
+        clock-names = "clkin", "core", "sana", "adc_clk", "adc_sel";
+};
+
 &sd_emmc_a {
         clocks = <&clkc CLKID_SD_EMMC_A>,
                  <&xtal>,
diff --git a/arch/arm64/boot/dts/amlogic/meson-gxm.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxm.dtsi
index 4c55665a253f..ddea7305c644 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxm.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxm.dtsi
@@ -117,6 +117,10 @@
         };
 };
 
+&saradc {
+        compatible = "amlogic,meson-gxm-saradc", "amlogic,meson-saradc";
+};
+
 &scpi_dvfs {
         clock-indices = <0 1>;
         clock-output-names = "vbig", "vlittle";