board: ti: am335x-ice: Configure the CDCE913 clock synthesizer

AM335x-ICE 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>

diff --git a/arch/arm/dts/am335x-icev2-u-boot.dtsi b/arch/arm/dts/am335x-icev2-u-boot.dtsi
new file mode 100644 (file)
index 0000000..cc9569a
--- /dev/null
+++ b/arch/arm/dts/am335x-icev2-u-boot.dtsi
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
+ */
+/ {
+       xtal25mhz: xtal25mhz {
+               compatible = "fixed-clock";
+               #clock-cells = <0>;
+               clock-frequency = <25000000>;
+       };
+};
+
+&i2c0 {
+       cdce913: cdce913@65 {
+               compatible = "ti,cdce913";
+               reg = <0x65>;
+               clocks = <&xtal25mhz>;
+               #clock-cells = <1>;
+               xtal-load-pf = <0>;
+       };
+};

diff --git a/board/ti/am335x/board.c b/board/ti/am335x/board.c
index 7eaa6cd..499c872 100644 (file)
--- a/board/ti/am335x/board.c
+++ b/board/ti/am335x/board.c
@@ -791,6 +791,7 @@ int board_init(void)
 #ifdef CONFIG_BOARD_LATE_INIT
 int board_late_init(void)
 {
+       struct udevice *dev;
 #if !defined(CONFIG_SPL_BUILD)
        uint8_t mac_addr[6];
        uint32_t mac_hi, mac_lo;
@@ -871,6 +872,9 @@ int board_late_init(void)
                        env_set("serial#", board_serial);
        }
 
+       /* Just probe the potentially supported cdce913 device */
+       uclass_get_device(UCLASS_CLK, 0, &dev);
+
        return 0;
 }
 #endif

diff --git a/configs/am335x_evm_defconfig b/configs/am335x_evm_defconfig
index 2aa9b65..93a28b2 100644 (file)
--- a/configs/am335x_evm_defconfig
+++ b/configs/am335x_evm_defconfig
@@ -77,3 +77,5 @@ CONFIG_DYNAMIC_CRC_TABLE=y
 CONFIG_RSA=y
 CONFIG_LZO=y
 # CONFIG_OF_LIBFDT_OVERLAY is not set
+CONFIG_CLK=y
+CONFIG_CLK_CDCE9XX=y