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board: ti: am43xx-idk: Configure the CDCE913 clock synthesizer

AM43xx-IDK boards contain the CDCE913 clock synthesizer, and their
reset crystal capacitance load value of 10pF is wrong leading into
lost packets in certain networking tests. Add DT data for this
device, and probe it from the board file to program the crystal
capacitance load value to 0pF to avoid any problems.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Tero Kristo 4 years ago
parent
commit
9850d4e52f
3 changed files with 21 additions and 0 deletions
  1. 14 0
      arch/arm/dts/am437x-idk-evm-u-boot.dtsi
  2. 5 0
      board/ti/am43xx/board.c
  3. 2 0
      configs/am43xx_evm_defconfig

+ 14 - 0
arch/arm/dts/am437x-idk-evm-u-boot.dtsi

@@ -9,6 +9,12 @@
 	ocp {
 		u-boot,dm-spl;
 	};
+
+	xtal25mhz: xtal25mhz {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <25000000>;
+	};
 };
 
 &uart0 {
@@ -17,6 +23,14 @@
 
 &i2c0 {
 	u-boot,dm-spl;
+
+	cdce913: cdce913@65 {
+		compatible = "ti,cdce913";
+		reg = <0x65>;
+		clocks = <&xtal25mhz>;
+		#clock-cells = <1>;
+		xtal-load-pf = <0>;
+	};
 };
 
 &mmc1 {

+ 5 - 0
board/ti/am43xx/board.c

@@ -720,6 +720,7 @@ static int device_okay(const char *path)
 
 int board_late_init(void)
 {
+	struct udevice *dev;
 #ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 	set_board_info_env(NULL);
 
@@ -737,6 +738,10 @@ int board_late_init(void)
 	if (device_okay("/ocp/omap_dwc3@483c0000"))
 		enable_usb_clocks(1);
 #endif
+
+	/* Just probe the potentially supported cdce913 device */
+	uclass_get_device(UCLASS_CLK, 0, &dev);
+
 	return 0;
 }
 #endif

+ 2 - 0
configs/am43xx_evm_defconfig

@@ -78,3 +78,5 @@ CONFIG_USB_GADGET_VENDOR_NUM=0x0403
 CONFIG_USB_GADGET_PRODUCT_NUM=0xbd00
 CONFIG_USB_GADGET_DOWNLOAD=y
 CONFIG_USB_ETHER=y
+CONFIG_CLK=y
+CONFIG_CLK_CDCE9XX=y