linux-kernel - Re: [PATCH 3/3] ARM: DRA7x: dts: Update the OSC_32K

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Date:	Wed, 27 Apr 2016 14:49:15 +0300
From:	Tero Kristo <t-kristo@...com>
To:	"J.D. Schroeder" <Linux.HWI@...min.com>,
	<linux-kernel@...r.kernel.org>, <bcousson@...libre.com>,
	<tony@...mide.com>, <robh+dt@...nel.org>, <pawel.moll@....com>,
	<mark.rutland@....com>, <ijc+devicetree@...lion.org.uk>,
	<galak@...eaurora.org>, <linux@....linux.org.uk>,
	<linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
CC:	"J.D. Schroeder" <jay.schroeder@...min.com>
Subject: Re: [PATCH 3/3] ARM: DRA7x: dts: Update the OSC_32K_CLK frequency

On 26/04/16 20:54, J.D. Schroeder wrote:
> From: "J.D. Schroeder" <jay.schroeder@...min.com>
>
> This commit updates the OSC_32K_CLK (secure_32k_clk_src_ck) frequency
> from the precise 32kHz frequency (i.e., 32.768 kHz) to the more
> accurate frequency of ~34.6 kHz. Actual measured frequencies of the
> clock vary from board to board anywhere from 34.4 kHz up to 34.8 kHz.

Uhm, if you have a board specific, accurate value for this clock, you 
should update it in the board file itself. This definition is going to 
be used across all the DRA7 / AM57xx boards, which can very likely have 
different crystal accuracies.

So, NAK.

-Tero

>
> Signed-off-by: J.D. Schroeder <jay.schroeder@...min.com>
> Reviewed-by: Trenton Andres <trenton.andres@...min.com>
> ---
>   arch/arm/boot/dts/dra7xx-clocks.dtsi | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/dra7xx-clocks.dtsi b/arch/arm/boot/dts/dra7xx-clocks.dtsi
> index a514fc3..4501140 100644
> --- a/arch/arm/boot/dts/dra7xx-clocks.dtsi
> +++ b/arch/arm/boot/dts/dra7xx-clocks.dtsi
> @@ -95,7 +95,7 @@
>   	secure_32k_clk_src_ck: secure_32k_clk_src_ck {
>   		#clock-cells = <0>;
>   		compatible = "fixed-clock";
> -		clock-frequency = <32768>;
> +		clock-frequency = <34600>; /* approximate frequency */
>   	};
>
>   	virt_12000000_ck: virt_12000000_ck {
>