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Message-ID: <556D925A.9070708@ti.com>
Date: Tue, 2 Jun 2015 16:54:10 +0530
From: Vignesh R <vigneshr@...com>
To: Tero Kristo <t-kristo@...com>, Paul Walmsley <paul@...an.com>,
Thierry Reding <thierry.reding@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Benoit Cousson <bcousson@...libre.com>,
Tony Lindgren <tony@...mide.com>,
Russell King <linux@....linux.org.uk>,
Mike Turquette <mturquette@...aro.org>,
Stephen Boyd <sboyd@...eaurora.org>
CC: <linux-pwm@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <linux-clk@...r.kernel.org>
Subject: Re: [PATCH 2/5] ARM: OMAP2+: DRA7: Add hwmod entries for PWMSS
Hi Tero,
On Tuesday 02 June 2015 01:51 PM, Tero Kristo wrote:
> On 06/01/2015 02:53 PM, Vignesh R wrote:
>> Add hwmod entries for the PWMSS on DRA7.
>
> Can you provide some documentation references for this data?
>
> I was looking at the TRM and at least the main_clk selection is somewhat
> unclear to me.
As per AM57x TRM SPRUHZ6, October 2014, Section 29.1.3 Table 29-4.
source signal as L4PER2_L3_GICLK but it is actually equal to
L4PER2_L3_GICLK/2. l4_root_clock_div is fixed-factored clock equal to
L4PER2_L3_GICLK/2 (l3_iclk_div/2 in Linux clock dt). The TRM does'nt
show factor of by 2. I will forward you an internal documentation that
talks about this.
I also measured the frequencies of PWM waveforms using oscilloscope and
it matches above observation.
I will update the patch description in v2.
Regards
Vignesh
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