From: Tomi Valkeinen <tomi.valkeinen@nokia.com>
To: linux-omap@vger.kernel.org
Subject: Setting dss1_alwon_fck
Date: Mon, 20 Oct 2008 15:11:34 +0300 [thread overview]
Message-ID: <1224504694.23383.11.camel@tubuntu> (raw)
Hi,
Mans Rullgard has the patches mentioned below in his kernel tree at
http://git.mansr.com/?p=linux-omap;a=summary . I currently have those
patches and use the following sequence to set the dss1_alwon_fck clock:
/* get the rate of the parent of dpll4_m4_ck, which is dpll4_ck */
prate = clk_get_rate(clk_get_parent(dispc.dpll4_m4_ck));
/* calculate divisor so that wanted dss1_alwon_fck is prate / div * 2.
* x2 because dss1_alwon_fck comes from dpll4_m4x2_ck */
div = ...;
/* set the rate */
clk_set_rate(dispc.dpll4_m4_ck, prate / div);
Is this the correct way to set dss1_alwon_fck? Are the patches below
needed, or can dss1_alwon_fck be set some other way?
Tomi
commit e2de5e5578fbaa9b4b75074796da0608fc93e6ae
Author: Mans Rullgard <mans@mansr.com>
Date: Tue Jul 22 01:58:18 2008 +0100
ARM: OMAP: add clk_get_parent() for OMAP2/3
Signed-off-by: Mans Rullgard <mans@mansr.com>
:100644 100644 577be44... 28aec36... M arch/arm/mach-omap2/clock.c
:100644 100644 49245f7... 4aa69d5... M arch/arm/mach-omap2/clock.h
:100644 100644 54cc6e1... ed7af21... M arch/arm/mach-omap2/clock24xx.c
:100644 100644 04dedec... 08c8c46... M arch/arm/mach-omap2/clock34xx.c
commit 2b7b958dc79e51127d7a4ecf88ce12dbc6c31426
Author: Mans Rullgard <mans@mansr.com>
Date: Tue Jul 22 01:31:11 2008 +0100
ARM: OMAP: make dpll4_m4_ck programmable with clk_set_rate()
Filling the set_rate and round_rate fields of dpll4_m4_ck makes
this clock programmable through clk_set_rate(). This is needed
to give omapfb control over the dss1_alwon_fck rate.
:100644 100644 161da12... 876eb13... M arch/arm/mach-omap2/clock34xx.h
next reply other threads:[~2008-10-20 12:11 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-20 12:11 Tomi Valkeinen [this message]
2008-10-20 23:23 ` Setting dss1_alwon_fck Måns Rullgård
2008-10-20 23:24 ` [PATCH 1/2] OMAP: Make dpll4_m4_ck programmable with clk_set_rate() Mans Rullgard
2008-12-05 23:52 ` Paul Walmsley
2008-12-06 0:11 ` Tony Lindgren
2008-12-06 1:03 ` Paul Walmsley
2008-12-06 1:10 ` Tony Lindgren
2008-12-06 1:40 ` Måns Rullgård
2008-12-06 2:12 ` Branch for fbdriver (Re: [PATCH 1/2] OMAP: Make dpll4_m4_ck programmable with clk_set_rate()) Tony Lindgren
2008-12-08 14:54 ` Tomi Valkeinen
2008-12-08 17:26 ` Tony Lindgren
2008-10-20 23:24 ` [PATCH 2/2] OMAP: Add clk_get_parent() for OMAP2/3 Mans Rullgard
2008-12-05 23:52 ` Paul Walmsley
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