From: Jan Dakinevich <yvdakinevich@xxxxxxxxxxxxxx>
The definition is inspired by a similar one for AXG SoC family.
'sdio_pins' and 'sdio_clk_gate_pins' pinctrls are supposed to be used as
"default" and "clk-gate" in board-specific device trees.
'meson-gx' driver during initialization sets clock to safe low-frequency
value (400kHz). However, both source clocks ("clkin0" and "clkin1") are
high-frequency by default, and using of eMMC's internal divider is not
enough to achieve so low values. To provide low-frequency source,
reparent "sd_emmc_sel2" clock using 'assigned-clocks' property.
Signed-off-by: Jan Dakinevich <yvdakinevich@xxxxxxxxxxxxxx>
Signed-off-by: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxx>
---
arch/arm64/boot/dts/amlogic/meson-a1.dtsi | 43 +++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/arch/arm64/boot/dts/amlogic/meson-a1.dtsi b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
index 3eb6aa9c00e0..a25170c61462 100644
--- a/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
@@ -134,6 +134,32 @@ mux {
bias-pull-down;
};
};
+
+ sdio_pins: sdio {
+ mux-0 {
+ groups = "sdcard_d0_x",
+ "sdcard_d1_x",
+ "sdcard_d2_x",
+ "sdcard_d3_x",
+ "sdcard_cmd_x";
+ function = "sdcard";
+ bias-pull-up;
+ };
+
+ mux-1 {
+ groups = "sdcard_clk_x";
+ function = "sdcard";
+ bias-disable;
+ };
+ };
+
+ sdio_clk_gate_pins: sdio_clk_gate {
+ mux {
+ groups = "sdcard_clk_x";
+ function = "sdcard";
+ bias-pull-down;
+ };
+ };
};
uart_AO: serial@1c00 {
@@ -200,6 +226,23 @@ usb2_phy1: phy@4000 {
#phy-cells = <0>;
power-domains = <&pwrc PWRC_USB_ID>;
};
+
+ sd_emmc: sd@10000 {
+ compatible = "amlogic,meson-axg-mmc";
+ reg = <0x0 0x10000 0x0 0x800>;
+ interrupts = <GIC_SPI 58 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&clkc_periphs CLKID_SD_EMMC_A>,
+ <&clkc_periphs CLKID_SD_EMMC>,
+ <&clkc_pll CLKID_FCLK_DIV2>;
+ clock-names = "core",
+ "clkin0",
+ "clkin1";
+ assigned-clocks = <&clkc_periphs CLKID_SD_EMMC_SEL2>;
+ assigned-clock-parents = <&xtal>;
+ resets = <&reset RESET_SD_EMMC_A>;
+ power-domains = <&pwrc PWRC_SD_EMMC_ID>;
+ status = "disabled";
+ };
};
gic: interrupt-controller@ff901000 {
--
2.36.0
