From: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: "Stephen Boyd" <sboyd@kernel.org>,
"Rob Herring" <robh+dt@kernel.org>,
"Andreas Färber" <afaerber@suse.de>,
"Michael Turquette" <mturquette@baylibre.com>,
"Edgar Bernardi Righi" <edgar.righi@lsitec.org.br>,
linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-actions@lists.infradead.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org
Subject: Re: [PATCH 4/6] clk: actions: Fix AHPPREDIV-H-AHB clock chain on Owl S500 SoC
Date: Thu, 27 May 2021 16:45:42 +0300 [thread overview]
Message-ID: <20210527134542.GC1300160@BV030612LT> (raw)
In-Reply-To: <20210526101230.GD10723@work>
On Wed, May 26, 2021 at 03:42:30PM +0530, Manivannan Sadhasivam wrote:
> On Tue, Mar 16, 2021 at 08:50:14PM +0200, Cristian Ciocaltea wrote:
> > 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?
> >
>
> Yes I do have a newer version of the datasheet (v1.8) and there I can
> see the divisor 0.
I got an updated datasheet (v1.9) and I confirm dividing by 1 is valid.
> > 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..
> >
>
> It is not as per the datasheet. Did you run into any issues with this?
> Else I'd suggest to keep it as it is.
I reverted the changes (please see v2) and did not encounter any issues
so far, so let's ignore the vendor driver implementation.
Thanks for the review,
Cristi
> Thanks,
> Mani
>
> > Thanks,
> > Cristi
> >
> > > Rest looks good to me.
> > >
> > > Thanks,
> > > Mani
> > >
> > [...]
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next prev parent reply other threads:[~2021-05-27 13:55 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-08 17:18 [PATCH 0/6] Improve clock support for Actions S500 SoC Cristian Ciocaltea
2021-03-08 17:18 ` [PATCH 1/6] clk: actions: Fix UART clock dividers on Owl " Cristian Ciocaltea
2021-03-16 3:50 ` Manivannan Sadhasivam
2021-03-08 17:18 ` [PATCH 2/6] clk: actions: Fix SD clocks factor table " Cristian Ciocaltea
2021-03-16 3:58 ` Manivannan Sadhasivam
2021-03-16 18:14 ` Cristian Ciocaltea
2021-05-26 10:07 ` Manivannan Sadhasivam
2021-05-27 13:27 ` Cristian Ciocaltea
2021-03-08 17:18 ` [PATCH 3/6] clk: actions: Fix bisp_factor_table based clocks " Cristian Ciocaltea
2021-03-16 4:17 ` Manivannan Sadhasivam
2021-03-16 18:37 ` Cristian Ciocaltea
2021-05-26 10:18 ` Manivannan Sadhasivam
2021-05-27 13:34 ` Cristian Ciocaltea
2021-03-08 17:18 ` [PATCH 4/6] clk: actions: Fix AHPPREDIV-H-AHB clock chain " Cristian Ciocaltea
2021-03-16 5:45 ` Manivannan Sadhasivam
2021-03-16 18:50 ` Cristian Ciocaltea
2021-05-26 10:12 ` Manivannan Sadhasivam
2021-05-27 13:45 ` Cristian Ciocaltea [this message]
2021-03-08 17:18 ` [PATCH 5/6] dt-bindings: clock: Add NIC and ETHERNET bindings for Actions " Cristian Ciocaltea
2021-03-16 22:00 ` Rob Herring
2021-03-08 17:18 ` [PATCH 6/6] clk: actions: Add NIC and ETHERNET clock support " Cristian Ciocaltea
2021-03-16 5:52 ` Manivannan Sadhasivam
2021-03-16 19:02 ` Cristian Ciocaltea
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