Enabling SDIO WiFi for SL1640 and SL1680

By default, SL1640 and SL1680 are configured to use PCIe based WiFi modules. But, SDIO support with the 43711S WiFi module can be enabled by updating the Linux Kernel’s DTS and config.

Modifying the Kernel

This requires modifying the linux-syna package using devtool:

devtool modify linux-syna

Updating the DTS File

Modify the platform dts file located in build-sl1680/workspace/sources/linux-syna/arch/arm64/boot/dts/synaptics.

	SL1640	SL1680
DTS	platypus-rdk.dts	dolphin-rdk.dts

The following sections need to be added / modified. The sections in dolphin-rdk.dts and platypus-rdk.dts are identical so the below patch applies to both platforms.

diff --git a/arch/arm64/boot/dts/synaptics/dolphin-rdk.dts b/arch/arm64/boot/dts/synaptics/dolphin-rdk.dts
index f3bf406ee518..31dc31d08e30 100644
--- a/arch/arm64/boot/dts/synaptics/dolphin-rdk.dts
+++ b/arch/arm64/boot/dts/synaptics/dolphin-rdk.dts
@@ -85,6 +85,12 @@ dmabuf_heap {
        pool-attributes = <0x00000105 0x00000F3A 0x00000102 0x00000F3D>;
    };

+   sdhci1_pwrseq: sdhci1-pwrseq {
+                   compatible = "mmc-pwrseq-simple";
+                   reset-gpios = <&expander1 2 GPIO_ACTIVE_LOW>;
+                   post-power-on-delay-ms = <50>;
+           };
+
    regulators {
        compatible = "simple-bus";
        #address-cells = <1>;
@@ -417,15 +423,15 @@ &sdhci0 {

&sdhci1 {
    status = "okay";
-   pinctrl-0 = <&sdhci1_pmux>, <&sdhci1_gpio_pmux>;
-   pinctrl-names = "default";
-   no-sdio;
+   bus-width = <4>;
+   no-sd;
    no-mmc;
-   disable-wp;
-   sdclkdl-dc = /bits/ 8 <75>;
-   pad-sp = /bits/ 8 <4>;
-   pad-sn = /bits/ 8 <4>;
-   vmmc-supply = <&vmmc_sdhci1>;
+   non-removable;
+   mmc-pwrseq = <&sdhci1_pwrseq>;
+   mode1-tune;
+   sdclkdl-dc = /bits/ 8 <35>;
+   pad-sp = /bits/ 8 <12>;
+   pad-sn = /bits/ 8 <12>;
};

&pcie_phy0 {

Updating the defconfig

Modify the defconfig file located in build-sl1680/workspace/sources/linux-syna/arch/arm64/configs.

	SL1640	SL1680
defconfig	platypus_defconfig	dolphin_defconfig

The following sections need to be added / modified. The sections in dolphin_defconfig and platypus_defconfig are identical so the below patch applies to both platforms.

diff --git a/arch/arm64/configs/dolphin_defconfig b/arch/arm64/configs/dolphin_defconfig
index 2c442ca0b26b..cd163c3e6efd 100644
--- a/arch/arm64/configs/dolphin_defconfig
+++ b/arch/arm64/configs/dolphin_defconfig
@@ -177,10 +177,10 @@ CONFIG_SYNA_CLK_BASE=y
CONFIG_SYNA_DOLPHIN_CLK=y
CONFIG_PINCTRL_DOLPHIN=y
CONFIG_MMC_SDHCI_OF_DWCMSHC=y
-CONFIG_PCIE_BERLIN=y
+#CONFIG_PCIE_BERLIN=y
CONFIG_REGULATOR_HL7593=m
CONFIG_REGULATOR_RPI_PANEL_ATTINY=m
-CONFIG_PHY_BERLIN_PCIE=y
+#CONFIG_PHY_BERLIN_PCIE=y
CONFIG_PHY_SYNA_USB=y
CONFIG_SENSORS_DOLPHIN=y
CONFIG_I2C_DYNDMX_PINCTRL=y
@@ -211,13 +211,11 @@ CONFIG_BCMDHD103=y
CONFIG_BCMDHD591=y
CONFIG_BCMDHD361=y
CONFIG_BCMDHD=m
-CONFIG_BCMDHD_PCIE=y
+CONFIG_BCMDHD_SDIO=y
CONFIG_BCM4362=y
CONFIG_DHD_OF_SUPPORT=y
-CONFIG_DHD_USE_SCHED_SCAN=y
# CONFIG_WLAIBSS is not set
# CONFIG_WL_RELMCAST is not set
-CONFIG_BCMDHD_PCIE_RUNTIMEPM=y
# CONFIG_SYNAPTICS_VIDEO is not set
CONFIG_SND_SOC_SYNA=m
CONFIG_SND_SOC_BERLIN_ASOC=m

Build the Updated Image

Build the image with the updated device tree entries:

devtool build linux-syna
devtool build-image astra-media