From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0E871C433F5 for ; Tue, 5 Oct 2021 07:12:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E1B4C6159A for ; Tue, 5 Oct 2021 07:12:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232222AbhJEHO0 (ORCPT ); Tue, 5 Oct 2021 03:14:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:53054 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230526AbhJEHO0 (ORCPT ); Tue, 5 Oct 2021 03:14:26 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4AC6861506; Tue, 5 Oct 2021 07:12:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1633417956; bh=Z1Kyh4CmT/HAHgyMmHMMCSHGxms9KPY2yA5BUj5ZFLg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=fCnJZF3GT8TJTOOoHPseEhYX2OVuS7WYLpZ3h2dcHx7a1PhFE9e9OxNIHbpT5F8PJ TK/qO6FF5eFOcjAYgEhdTvpi6vIuyrpEvR8lRQhaHfNSaUCApvEsAyszRCnGJCHiLG LKyqaQh6eQpNMOkeA1v4n0YkfOxY37o4FlEp/paZHfEm1f91KKqZ+dzmjaFneaEwBW lNAE4mJKT6CTNO6+S1RxkNEbHBSUuholIp/7XMbwUUwKNNCHubH+O/NbwTKOFCzQ98 +Jtt+S91lmXPhd77E8Fs090n3bt0b3FECB065apme/VW+lXCKEnOPNWQX7ExKQCBFU aAsuC9SG4KJ6g== Date: Tue, 5 Oct 2021 15:12:31 +0800 From: Shawn Guo To: Frieder Schrempf Cc: devicetree@vger.kernel.org, Frieder Schrempf , Krzysztof Kozlowski , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Rob Herring , Sascha Hauer , stable@vger.kernel.org, Fabio Estevam , NXP Linux Team , Pengutronix Kernel Team Subject: Re: [PATCH 5/8] arm64: dts: imx8mm-kontron: Fix CAN SPI clock frequency Message-ID: <20211005071230.GC20743@dragon> References: <20210930155633.2745201-1-frieder@fris.de> <20210930155633.2745201-6-frieder@fris.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210930155633.2745201-6-frieder@fris.de> User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Thu, Sep 30, 2021 at 05:56:28PM +0200, Frieder Schrempf wrote: > From: Frieder Schrempf > > The MCP2515 can be used with an SPI clock of up to 10 MHz. Set the > limit accordingly to prevent any performance issues caused by the > really low clock speed of 100 kHz. Could you share some testing result of this change? > > Fixes: 21c4f45b335f ("arm64: dts: Add the Kontron i.MX8M Mini SoMs and baseboards") It's really an optimization rather than fix, isn't it? Shawn > Cc: stable@vger.kernel.org > Signed-off-by: Frieder Schrempf > --- > arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts > index f2c8ccefd1bf..dbf11e03ecce 100644 > --- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts > +++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts > @@ -98,7 +98,7 @@ can0: can@0 { > clocks = <&osc_can>; > interrupt-parent = <&gpio4>; > interrupts = <28 IRQ_TYPE_EDGE_FALLING>; > - spi-max-frequency = <100000>; > + spi-max-frequency = <10000000>; > vdd-supply = <®_vdd_3v3>; > xceiver-supply = <®_vdd_5v>; > }; > -- > 2.33.0 >