Re: [PATCH 4/6] clk: actions: Fix AHPPREDIV-H-AHB clock chain on Owl S500 SoC

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, Mar 16, 2021 at 11:15:47AM +0530, Manivannan Sadhasivam wrote:
> On Mon, Mar 08, 2021 at 07:18:29PM +0200, Cristian Ciocaltea wrote:
> > There are a few issues with the setup of the Actions Semi Owl S500 SoC's
> > clock chain involving AHPPREDIV, H and AHB clocks:
> > 
> > * AHBPREDIV clock is defined as a muxer only, although it also acts as
> >   a divider.
> > * H clock is defined as a standard divider, although the raw value zero
> >   is not supported.
> 
> What do you mean by not supported? The datasheet lists "0" as the valid divisor
> value for divide by 1.

Unfortunately CMU_BUSCLK1 is not documented in my S500 Datasheet
(Version: 1.6, 2016-03-07). Do you have a newer (or a more official)
one?

The reference xapp-le code snipped is:

static struct owl_div divider_H_CLK = {
    .type = DIV_T_NATURE,
    .range_from = 1,  /* reserve H_CLK divsor 1 */
    .range_to = 3,
    .reg = &divbit_H_CLK,
};

Not sure why divisor 1 has been reserved..

Thanks,
Cristi

> Rest looks good to me.
> 
> Thanks,
> Mani
> 
[...]



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux