On Wed, 19 May 2010, Danilo Caravana wrote: > I'm using Linux kernel on my OMAP 3530 product, but i need the McSPI > running at exactly 6,5 Mhz. The problem is that McSPI clocks is derived > from DPLL4 which has a 96 MHz output.
You might be able to change the source of 48M_FCLK to come from the OMAP's sys_altclk ball via clk_set_parent(), and feed an external 6.5MHz clock (or some multiple) in sys_altclk. HDQ/1WIRE, UART1, UART2 would be affected also, but maybe you don't need those. Of course, that will probably mean a board change... > I need to change the DPLL4 clock in Linux, and need everything else > working (Except USB, which need 48MHz). You could also try reducing the DPLL4 frequency with clk_set_rate(), but that really could affect many other peripherals. USB should be clocked by DPLL5, so you should be safe there. > Analysing the kernel code, I couldn't find where the DPLL4 is set It's probably set by your bootloader, usually X-Loader or U-Boot. - Paul -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
