On 02/14/2016 06:02 PM, Antony Pavlov wrote: > On Sun, 14 Feb 2016 14:44:36 +0100 > Marek Vasut <marex@xxxxxxx> wrote: > >> On 02/13/2016 10:58 PM, Antony Pavlov wrote: >>> From: Weijie Gao <hackpascal@xxxxxxxxx> >>> >>> According to the AR7242 datasheet section 2.8, AR724X CPUs use a 40MHz >>> input clock as the REF_CLK instead of 5MHz. >> >> Can't the AR71xx also use 25MHz clock source ? > > > I have just googled AR7242 datasheet. > I states that only 40 MHz reference clock is used. Gotcha, so it's only the later chips which can do both. Thanks!