linux-kernel - Re: [BISECTED] OMAP: DSS: clk rate mismatch

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Date:	Wed, 29 Jan 2014 11:10:30 +0200
From:	Tero Kristo <t-kristo@...com>
To:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>
CC:	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <pali.rohar@...il.com>,
	<pavel@....cz>, <chf.fritz@...glemail.com>, <nm@...com>
Subject: Re: [BISECTED] OMAP: DSS: clk rate mismatch

On 01/28/2014 08:17 PM, Ivaylo Dimitrov wrote:
>
>
> On 28.01.2014 10:48, Tomi Valkeinen wrote:
>
>> I made a somewhat hacky quickfix for beagle. Applying that and the
>> clk-divider from the link above makes things work for me. However, as I
>> said, the issue with n900 might be different, but it'd be interesting to
>> hear if it has any effect.
>>
>>   Tomi
>>
>
> Applying those 2 patches doesn't help, still get exactly the same warning.
>
> Find attached my clk_summary (with my hacky patch applied, otherwise I
> cannot boot the device)
>
> Ivo

It looks like the omap36xx version of the omap96m_alwon_fck is modelled 
improperly in the dts files. I don't have access to omap36xx hardware 
myself, but give a try for the following patch:


From: Tero Kristo <t-kristo@...com>
Date: Wed, 29 Jan 2014 11:03:46 +0200
Subject: [PATCH] ARM: dts: omap36xx: fix omap96m_alwon_fck

OMAP36xx has different hardware implementation for the omap96m_alwon_fck
compared to other OMAP3 variants. Reflect this properly in the dts file.

Signed-off-by: Tero Kristo <t-kristo@...com>
---
  arch/arm/boot/dts/omap36xx-clocks.dtsi |    9 +++++++++
  1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/omap36xx-clocks.dtsi 
b/arch/arm/boot/dts/omap36xx-clocks.dtsi
index 2fcf253..24ddf3f 100644
--- a/arch/arm/boot/dts/omap36xx-clocks.dtsi
+++ b/arch/arm/boot/dts/omap36xx-clocks.dtsi
@@ -88,3 +88,12 @@
  			 <&mcbsp4_ick>, <&uart4_fck>;
  	};
  };
+
+&omap_96m_alwon_fck {
+	compatible = "ti,divider-clock";
+	clocks = <&omap_192m_alwon_fck>;
+	ti,bit-shift = <12>;
+	ti,max-div = <2>;
+	reg = <0x0a40>;
+	ti,index-starts-at-one;
+};
-- 
1.7.9.5
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