From: Vignesh R <vigneshr@ti.com>
To: Tero Kristo <t-kristo@ti.com>, Paul Walmsley <paul@pwsan.com>,
Thierry Reding <thierry.reding@gmail.com>,
Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
Benoit Cousson <bcousson@baylibre.com>,
Tony Lindgren <tony@atomide.com>,
Russell King <linux@arm.linux.org.uk>,
Mike Turquette <mturquette@linaro.org>,
Stephen Boyd <sboyd@codeaurora.org>
Cc: linux-pwm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org
Subject: Re: [PATCH 2/5] ARM: OMAP2+: DRA7: Add hwmod entries for PWMSS
Date: Tue, 2 Jun 2015 16:54:10 +0530 [thread overview]
Message-ID: <556D925A.9070708@ti.com> (raw)
In-Reply-To: <556D6781.2090405@ti.com>
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
next prev parent reply other threads:[~2015-06-02 11:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-01 11:53 [PATCH 0/5] Add support for PWMSS on DRA7 Vignesh R
2015-06-01 11:53 ` [PATCH 1/5] ARM: OMAP2+: DRA7: clockdomain: change l4per2_7xx_clkdm to SW_WKUP Vignesh R
2015-06-01 11:53 ` [PATCH 2/5] ARM: OMAP2+: DRA7: Add hwmod entries for PWMSS Vignesh R
2015-06-02 8:21 ` Tero Kristo
2015-06-02 11:24 ` Vignesh R [this message]
2015-06-01 11:53 ` [PATCH 3/5] ARM: dts: DRA7: Add TBCLK " Vignesh R
2015-06-02 8:22 ` Tero Kristo
2015-06-02 11:23 ` Vignesh R
2015-06-01 11:53 ` [PATCH 4/5] clk: ti: DRA7: Add tbclk data for ehrpwm Vignesh R
2015-06-01 11:53 ` [PATCH 5/5] ARM: dts: DRA7: Add dt nodes for PWMSS Vignesh R
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