netdev - Re: [net-next v3 4/5] net: ethernet: renesas: rcar_gen4

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Message-ID: <20231122203323.GG6731@kernel.org>
Date: Wed, 22 Nov 2023 20:33:23 +0000
From: Simon Horman <horms@...nel.org>
To: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Richard Cochran <richardcochran@...il.com>, netdev@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [net-next v3 4/5] net: ethernet: renesas: rcar_gen4_ptp: Get
 clock increment from clock rate

On Tue, Nov 21, 2023 at 04:53:05PM +0100, Niklas Söderlund wrote:
> Instead of using hard coded clock increment values for each SoC derive
> the clock increment from the module clock. This is done in preparation
> to support a second platform, R-Car V4H that uses a 200Mhz clock
> compared with the 320Mhz clock used on R-Car S4.
> 
> Tested on both SoCs,
> 
> S4 reports a clock of 320000000Hz which gives a value of 0x19000000.
> Documentation says a 320Mhz clock is used and the correct increment for
> that clock is 0x19000000.
> 
> V4H reports a clock of 199999992Hz which gives a value of 0x2800001a.
> Documentation says a 200Mhz clock is used and the correct increment for
> that clock is 0x28000000.
> 
> Suggested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

Reviewed-by: Simon Horman <horms@...nel.org>