netdev - Re: [PATCH 1/2] can: rcar_can: Add r8a7795 support

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Message-ID: <56D43DC8.8010409@pengutronix.de>
Date:	Mon, 29 Feb 2016 13:47:04 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Ramesh Shanmugasundaram <ramesh.shanmugasundaram@...renesas.com>,
	"wg@...ndegger.com" <wg@...ndegger.com>,
	"horms@...ge.net.au" <horms@...ge.net.au>,
	"magnus.damm@...il.com" <magnus.damm@...il.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>
Cc:	"linux-renesas-soc@...r.kernel.org" 
	<linux-renesas-soc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Chris Paterson <Chris.Paterson2@...esas.com>
Subject: Re: [PATCH 1/2] can: rcar_can: Add r8a7795 support

On 02/29/2016 11:00 AM, Marc Kleine-Budde wrote:
> I think it's better to fix the algorithm. I'll look into it.

What about:

> ./can-calc-bit-timing -c 39999998 rcar_can                                                         
> Bit timing parameters for rcar_can with 39.999998 MHz ref clock
> nominal                                 real Bitrt   nom  real SampP
> Bitrate TQ[ns] PrS PhS1 PhS2 SJW BRP Bitrate Error SampP SampP Error      CiBCR
> 1000000    125   2    3    2   1   5  999999  0.0% 75.0% 75.0%  0.0% 0x40040100
>  800000    125   3    4    2   1   5  799999  0.0% 80.0% 80.0%  0.0% 0x60040100
>  500000    125   6    7    2   1   5  499999  0.0% 87.5% 87.5%  0.0% 0xc0040100
>  250000    250   6    7    2   1  10  249999  0.0% 87.5% 87.5%  0.0% 0xc0090100
>  125000    500   6    7    2   1  20  124999  0.0% 87.5% 87.5%  0.0% 0xc0130100
>  100000    625   6    7    2   1  25   99999  0.0% 87.5% 87.5%  0.0% 0xc0180100
>   50000   1250   6    7    2   1  50   49999  0.0% 87.5% 87.5%  0.0% 0xc0310100
>   20000   3125   6    7    2   1 125   19999  0.0% 87.5% 87.5%  0.0% 0xc07c0100
>   10000   6250   6    7    2   1 250    9999  0.0% 87.5% 87.5%  0.0% 0xc0f90100

But I've to port the algorithm from can-calc-bit-timing to the kernel.

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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