Linux/AM4376: PLL configuration

Hi kazu,

Regarding EXTDEV PLL and Display PLL, we have no configuration code in u-boot. You can add your own, see for EXTDEV PLL example below file:

u-boot/board/compulab/cm_t43/cm_t43.c

static void board_phy_init(void)
{
set_mdio_pin_mux();
writel(0x40003, 0x44e10a74); /* Mux pin as clkout2 */ //CTRL_CONF_XDMA_EVT_INTR1[3:0] = 0x3
writel(0x10006, 0x44df4108); /* Select EXTDEV as clock source */ //PRCM_CM_CLKOUT2_CTRL[2:0] = 0x6
writel(0x4, 0x44df2e60); /* Set EXTDEV as MNbypass */ //PRCM_CM_CLKMODE_DPLL_EXTDEV[[2:0] = 0x4

/* For revision A */
writel(0x2000009, 0x44df2e6c); //PRCM_CM_CLKSEL_DPLL_EXTDEV
writel(0x38a, 0x44df2e70); //PRCM_CM_DIV_M2_DPLL_EXTDEV

Note also that the default value is determined by sysboot5 pin value, check AM437x TRM, section 5.2.5.2 SYSBOOT Configuration Pins

Regards,
Pavel