[PATCH 1/2] mediatek: filogic: add SD card support to GatoNetworks GDSP

Enrico Mioso mrkiko.rs at gmail.com
Wed Jun 11 02:26:19 PDT 2025 

The device is equipped with a GPS module, reporting data via /dev/ttyS1.
A TF card reader is also present. Only one of those components can be
used at once, since they share some PINs.
This commit adds two devicetree overlays to allow for the user to select
the desired configuration. A third overlay configuration to allow booting
from an SD card is provided.

Signed-off-by: Enrico Mioso <mrkiko.rs at gmail.com>
---
 .../dts/mt7981b-gatonetworks-gdsp-gps.dtso    | 15 ++++
 .../mt7981b-gatonetworks-gdsp-sd-boot.dtso    | 30 ++++++++
 .../dts/mt7981b-gatonetworks-gdsp-sd.dtso     | 15 ++++
 .../dts/mt7981b-gatonetworks-gdsp.dts         | 69 ++++++++++++++++++-
 .../base-files/lib/upgrade/platform.sh        |  3 +-
 target/linux/mediatek/image/filogic.mk        | 20 +++++-
 6 files changed, 148 insertions(+), 4 deletions(-)
 create mode 100644 target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-gps.dtso
 create mode 100644 target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-sd-boot.dtso
 create mode 100644 target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-sd.dtso

diff --git a/target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-gps.dtso b/target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-gps.dtso
new file mode 100644
index 0000000000..f2175d81e6
--- /dev/null
+++ b/target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-gps.dtso
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "gatonetworks,gdsp", "mediatek,mt7981";
+
+	fragment at 0 {
+		target = <&uart1>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+};
diff --git a/target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-sd-boot.dtso b/target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-sd-boot.dtso
new file mode 100644
index 0000000000..46a07cf683
--- /dev/null
+++ b/target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-sd-boot.dtso
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "gatonetworks,gdsp", "mediatek,mt7981";
+
+	fragment at 1 {
+		target = <&mmc0>;
+		__overlay__ {
+			card at 0 {
+				compatible = "mmc-card";
+				reg = <0>;
+
+				partitions {
+					compatible = "gpt-partitions";
+
+					sdmmc_fit: block-partition-fit {
+						partname = "FIT";
+					};
+				};
+			};
+		};
+	};
+};
+
+&{/chosen} {
+	rootdisk = <&sdmmc_fit>;
+};
diff --git a/target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-sd.dtso b/target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-sd.dtso
new file mode 100644
index 0000000000..cc822810f6
--- /dev/null
+++ b/target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-sd.dtso
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "gatonetworks,gdsp", "mediatek,mt7981";
+
+	fragment at 0 {
+		target = <&mmc0>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+};
diff --git a/target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp.dts b/target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp.dts
index ad09ff8bcd..2719b17656 100644
--- a/target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp.dts
+++ b/target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp.dts
@@ -127,6 +127,23 @@
 	status = "okay";
 };
 
+&mmc0 {
+	status = "disabled";
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+	pinctrl-names = "default", "state_uhs";
+	pinctrl-0 = <&mmc0_pins_default>;
+	pinctrl-1 = <&mmc0_pins_uhs>;
+	bus-width = <4>;
+	max-frequency = <50000000>;
+	cap-sd-highspeed;
+	vmmc-supply = <&reg_3p3v>;
+	vqmmc-supply = <&reg_3p3v>;
+	no-mmc;
+	no-sdio;
+};
+
 &eth {
 	status = "okay";
 
@@ -334,6 +351,56 @@
 		};
 	};
 
+	mmc0_pins_default: mmc0-pins-default {
+		mux {
+			function = "flash";
+			groups = "emmc_45";
+		};
+		conf-cmd-dat {
+			pins = "SPI0_CLK", "SPI0_MOSI", "SPI0_MISO",
+				"SPI0_CS",  "SPI0_HOLD", "SPI0_WP",
+				"SPI1_CLK", "SPI1_MOSI", "SPI1_MISO";
+			input-enable;
+			drive-strength = <MTK_DRIVE_4mA>;
+			bias-pull-up = <MTK_PUPD_SET_R1R0_01>;
+		};
+		conf-clk {
+			pins = "SPI1_CS";
+			drive-strength = <MTK_DRIVE_8mA>;
+			bias-pull-down = <MTK_PUPD_SET_R1R0_10>;
+		};
+		conf-rst {
+			pins = "PWM0";
+			drive-strength = <MTK_DRIVE_4mA>;
+			bias-pull-up = <MTK_PUPD_SET_R1R0_01>;
+		};
+	};
+
+	mmc0_pins_uhs: mmc0-pins-uhs {
+		mux {
+			function = "flash";
+			groups = "emmc_45";
+		};
+		conf-cmd-dat {
+			pins = "SPI0_CLK", "SPI0_MOSI", "SPI0_MISO",
+				"SPI0_CS",  "SPI0_HOLD", "SPI0_WP",
+				"SPI1_CLK", "SPI1_MOSI", "SPI1_MISO";
+			input-enable;
+			drive-strength = <MTK_DRIVE_4mA>;
+			bias-pull-up = <MTK_PUPD_SET_R1R0_01>;
+		};
+		conf-clk {
+			pins = "SPI1_CS";
+			drive-strength = <MTK_DRIVE_8mA>;
+			bias-pull-down = <MTK_PUPD_SET_R1R0_10>;
+		};
+		conf-rst {
+			pins = "PWM0";
+			drive-strength = <MTK_DRIVE_4mA>;
+			bias-pull-up = <MTK_PUPD_SET_R1R0_01>;
+		};
+	};
+
 	uart2_pins: uart2-pins {
 		mux {
 			function = "uart";
@@ -368,7 +435,7 @@
 &uart1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart1_pins>;
-	status = "okay";
+	status = "disabled";
 };
 
 &uart2 {
diff --git a/target/linux/mediatek/filogic/base-files/lib/upgrade/platform.sh b/target/linux/mediatek/filogic/base-files/lib/upgrade/platform.sh
index 7d204b9196..21fc2a5f55 100755
--- a/target/linux/mediatek/filogic/base-files/lib/upgrade/platform.sh
+++ b/target/linux/mediatek/filogic/base-files/lib/upgrade/platform.sh
@@ -261,7 +261,8 @@ platform_copy_config() {
 	bananapi,bpi-r4|\
 	bananapi,bpi-r4-2g5|\
 	bananapi,bpi-r4-poe|\
-	cmcc,rax3000m)
+	cmcc,rax3000m|\
+	gatonetworks,gdsp)
 		if [ "$CI_METHOD" = "emmc" ]; then
 			emmc_copy_config
 		fi
diff --git a/target/linux/mediatek/image/filogic.mk b/target/linux/mediatek/image/filogic.mk
index 337403411a..c0125b26f7 100644
--- a/target/linux/mediatek/image/filogic.mk
+++ b/target/linux/mediatek/image/filogic.mk
@@ -30,6 +30,14 @@ define Build/mt7988-bl31-uboot
 	cat $(STAGING_DIR_IMAGE)/mt7988_$1-u-boot.fip >> $@
 endef
 
+define Build/simplefit
+	cp $@ $@.tmp 2>/dev/null || true
+	ptgen -g -o $@.tmp -a 1 -l 1024 \
+	-t 0x2e -N FIT		-p $(CONFIG_TARGET_ROOTFS_PARTSIZE)M at 17k
+	cat $@.tmp >> $@
+	rm $@.tmp
+endef
+
 define Build/mt798x-gpt
 	cp $@ $@.tmp 2>/dev/null || true
 	ptgen -g -o $@.tmp -a 1 -l 1024 \
@@ -925,15 +933,23 @@ define Device/gatonetworks_gdsp
   DEVICE_VENDOR := GatoNetworks
   DEVICE_MODEL := gdsp
   DEVICE_DTS := mt7981b-gatonetworks-gdsp
+  DEVICE_DTS_OVERLAY := \
+  mt7981b-gatonetworks-gdsp-gps \
+  mt7981b-gatonetworks-gdsp-sd \
+  mt7981b-gatonetworks-gdsp-sd-boot
   DEVICE_DTS_DIR := ../dts
+  DEVICE_DTC_FLAGS := --pad 4096
   IMAGES := sysupgrade.itb
   IMAGE_SIZE := 32768k
-  DEVICE_PACKAGES := fitblk kmod-mt7915e kmod-mt7981-firmware \
+  DEVICE_PACKAGES := e2fsprogs f2fsck mkf2fs fitblk \
+    kmod-mt7915e kmod-mt7981-firmware \
     kmod-usb-net-qmi-wwan kmod-usb-serial-option kmod-usb3 \
     mt7981-wo-firmware -kmod-phy-aquantia
-  ARTIFACTS := preloader.bin bl31-uboot.fip
+  ARTIFACTS := preloader.bin bl31-uboot.fip sdcard.img.gz
   ARTIFACT/preloader.bin := mt7981-bl2 nor-ddr3
   ARTIFACT/bl31-uboot.fip := mt7981-bl31-uboot gatonetworks_gdsp
+  ARTIFACT/sdcard.img.gz := simplefit |\
+  append-image squashfs-sysupgrade.itb | check-size | gzip
   KERNEL := kernel-bin | gzip
   KERNEL_INITRAMFS := kernel-bin | lzma | \
 	fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb with-initrd | pad-to 64k
-- 
2.49.0

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