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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 460E8CCA470 for ; Tue, 7 Oct 2025 16:26:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=sux+G8UYuTe6OpX0yXYNFv4IijM8dkNkYRTT0OHVyw0=; b=s+0slQY+ojm1zm2l6PpudPV+9O obSfxzz50OsMBykWvWvcJAs/foIamGcDFuuV97jgCKmdjXV9qinbK9LSm5im6ef5rjx2AjM/aq17A BheY7F3t/XPPIuFwY6+mnDqIswzy95O+z/ZwUZCLgXFzwTvFZp5gFwV4Rzly1NR20MEl+35eU9g8h +3C6o2efqODAgi9AjTGohDEHgRRzPbSdjXRwEa97DLKAHsUb865Zs3WJR/OAdpOhkNsNZhyyosEhV i9TdeD/J+FCqOjJATWzhv3odRlX9hxCmKcJOuVD4UsfotEQ19vm3q+dO93yoX0TBNOa7AAMYkl3Lp dkT85tbQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v6AVy-00000002OtC-3nU9; Tue, 07 Oct 2025 16:26:14 +0000 Received: from pandora.armlinux.org.uk ([2001:4d48:ad52:32c8:5054:ff:fe00:142]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1v6AVs-00000002Osf-35CN; Tue, 07 Oct 2025 16:26:13 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=sux+G8UYuTe6OpX0yXYNFv4IijM8dkNkYRTT0OHVyw0=; b=Yt+zyzdaOOyvXP4CN8scOQIvB7 hMr62mIPLsssoXyHhcgac7K4DzmccMDIDSjxxYEeR/8RneyHCtA0Inha4T4G6cc99kLkMBLuYp9mE GaJ+IVuQgqMWNgnetTmMcsMSASET8pF08TRHopxw9XugNyFZ1Bg8dmIT/Wn9yqx8sAZN8rKQCcetI +D46UgqmLdVqetuBPV745ZPMCeWNxSYEKrWmXD2vvkzCUD9a4doViK4QyD94QWfQHRpu45gB4SlcC APYp4cD7U9E/tg6+sYz0/8sUk4Q25qD4ZqDY0LLWdjvnzN3/Iyg65K8KMd+kTIzjy9hMxRlyAEngO Nj8ev45w==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:58244) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1v6AVR-000000005LF-197N; Tue, 07 Oct 2025 17:25:41 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.98.2) (envelope-from ) id 1v6AVK-0000000032Z-2vLE; Tue, 07 Oct 2025 17:25:34 +0100 Date: Tue, 7 Oct 2025 17:25:34 +0100 From: "Russell King (Oracle)" To: Andrew Lunn Cc: jjm2473 , robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, heiko@sntech.de, quentin.schulz@cherry.de, kever.yang@rock-chips.com, naoki@radxa.com, honyuenkwun@gmail.com, inindev@gmail.com, ivan8215145640@gmail.com, neil.armstrong@linaro.org, mani@kernel.org, dsimic@manjaro.org, pbrobinson@gmail.com, alchark@gmail.com, didi.debian@cknow.org, jbx6244@gmail.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 3/3] arm64: dts: rockchip: add LinkEase EasePi R1 Message-ID: References: <20250929065714.27741-1-jjm2473@gmail.com> <20250929065714.27741-4-jjm2473@gmail.com> <7e219aef-88a0-4184-9553-30dcbc8dbd79@lunn.ch> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <7e219aef-88a0-4184-9553-30dcbc8dbd79@lunn.ch> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251007_092609_045943_AFF8FEE9 X-CRM114-Status: GOOD ( 17.10 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Oct 07, 2025 at 04:57:32PM +0200, Andrew Lunn wrote: > On Tue, Oct 07, 2025 at 10:32:26PM +0800, jjm2473 wrote: > > Andrew Lunn 于2025年10月6日周一 23:51写道： > > > Please change it to rgmii-id, and smaller tx/rx_delay values. Or show > > > us the schematics which clearly show extra long clock lines. > > > > In fact, the RTL8211F's RXDLY and TXDLY signals are both pulled low, > > just like the Banana Pi BPI-R2 Pro, so the configuration is also referenced: > > https://elixir.bootlin.com/linux/v6.15/source/arch/arm64/boot/dts/rockchip/rk3568-bpi-r2-pro.dts#L237 > > Pull low makes no difference to the 2ns RGMII delays. To be clear, while the RXDLY and TXDLY are hardware strapping controls the hardware configuration of the 2ns RGMII clock delays, the realtek driver can (and does) override this according to the phy-mode property. Thus hardware strapping makes no difference to Linux. So, what we get at the RTL8211F PHY is: phy-mode receive clock delay transmit clock delay "rgmii" 0ns 0ns "rgmii-rxid" 2ns 0ns "rgmii-txid" 0ns 2ns "rgmii-id" 2ns 2ns irrespective of RXDLY / TXDLY hardware strapping. > > The tx_delay and rx_delay values were obtained using Rockchip's > > automatic scanning tool: > > https://github.com/istoreos/istoreos/blob/54746dfdb5bd34d1f281cf41d1d1620d0c3ee686/target/linux/rockchip/files/drivers/net/ethernet/stmicro/stmmac/dwmac-rk-tool.c > > https://gitlab.com/firefly-linux/docs/-/blob/rk356x/firefly/Common/GMAC/Rockchip_Developer_Guide_Linux_GMAC_RGMII_Delayline_EN.pdf > > https://github.com/axlrose/rkdocs/blob/main/Common/GMAC/Rockchip_Developer_Guide_Linux_GMAC_RGMII_Delayline_EN.pdf > > Vendors get things wrong, including this. 'rgmii' means the PCB adds > the 2ns delay. Nearly every Rockchip board follows Rockchip broken > vendor recommendations, and then i come along, point out how it is > wrong, and ask for it to be fixed, before being merged to Mainline. Can we at least get the "tx_delay" and "rx_delay" DT properties (which are register values) properly documented in the DT binding document? I know from the driver code that a value of 0 means "no delay". Other values add an unspecified delay - it is not obvious what any non-zero value means, or what the default means. This would help us understand what values such as: tx_delay = 0x3c or 0x4f and rx_delay = 0x2f or 0x26 actually mean in terms of the resulting delay at the MAC. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last! 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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:58244) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1v6AVR-000000005LF-197N; Tue, 07 Oct 2025 17:25:41 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.98.2) (envelope-from ) id 1v6AVK-0000000032Z-2vLE; Tue, 07 Oct 2025 17:25:34 +0100 Date: Tue, 7 Oct 2025 17:25:34 +0100 From: "Russell King (Oracle)" To: Andrew Lunn Cc: jjm2473 , robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, heiko@sntech.de, quentin.schulz@cherry.de, kever.yang@rock-chips.com, naoki@radxa.com, honyuenkwun@gmail.com, inindev@gmail.com, ivan8215145640@gmail.com, neil.armstrong@linaro.org, mani@kernel.org, dsimic@manjaro.org, pbrobinson@gmail.com, alchark@gmail.com, didi.debian@cknow.org, jbx6244@gmail.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 3/3] arm64: dts: rockchip: add LinkEase EasePi R1 Message-ID: References: <20250929065714.27741-1-jjm2473@gmail.com> <20250929065714.27741-4-jjm2473@gmail.com> <7e219aef-88a0-4184-9553-30dcbc8dbd79@lunn.ch> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <7e219aef-88a0-4184-9553-30dcbc8dbd79@lunn.ch> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251007_092609_045943_AFF8FEE9 X-CRM114-Status: GOOD ( 17.10 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org T24gVHVlLCBPY3QgMDcsIDIwMjUgYXQgMDQ6NTc6MzJQTSArMDIwMCwgQW5kcmV3IEx1bm4gd3Jv dGU6Cj4gT24gVHVlLCBPY3QgMDcsIDIwMjUgYXQgMTA6MzI6MjZQTSArMDgwMCwgamptMjQ3MyB3 cm90ZToKPiA+IEFuZHJldyBMdW5uIDxhbmRyZXdAbHVubi5jaD4g5LqOMjAyNeW5tDEw5pyINuaX peWRqOS4gCAyMzo1MeWGmemBk++8mgo+ID4gPiBQbGVhc2UgY2hhbmdlIGl0IHRvIHJnbWlpLWlk LCBhbmQgc21hbGxlciB0eC9yeF9kZWxheSB2YWx1ZXMuIE9yIHNob3cKPiA+ID4gdXMgdGhlIHNj aGVtYXRpY3Mgd2hpY2ggY2xlYXJseSBzaG93IGV4dHJhIGxvbmcgY2xvY2sgbGluZXMuCj4gPiAK PiA+IEluIGZhY3QsIHRoZSBSVEw4MjExRidzIFJYRExZIGFuZCBUWERMWSBzaWduYWxzIGFyZSBi b3RoIHB1bGxlZCBsb3csCj4gPiBqdXN0IGxpa2UgdGhlIEJhbmFuYSBQaSBCUEktUjIgUHJvLCBz byB0aGUgY29uZmlndXJhdGlvbiBpcyBhbHNvIHJlZmVyZW5jZWQ6Cj4gPiBodHRwczovL2VsaXhp ci5ib290bGluLmNvbS9saW51eC92Ni4xNS9zb3VyY2UvYXJjaC9hcm02NC9ib290L2R0cy9yb2Nr Y2hpcC9yazM1NjgtYnBpLXIyLXByby5kdHMjTDIzNwo+IAo+IFB1bGwgbG93IG1ha2VzIG5vIGRp ZmZlcmVuY2UgdG8gdGhlIDJucyBSR01JSSBkZWxheXMuCgpUbyBiZSBjbGVhciwgd2hpbGUgdGhl IFJYRExZIGFuZCBUWERMWSBhcmUgaGFyZHdhcmUgc3RyYXBwaW5nIGNvbnRyb2xzCnRoZSBoYXJk d2FyZSBjb25maWd1cmF0aW9uIG9mIHRoZSAybnMgUkdNSUkgY2xvY2sgZGVsYXlzLCB0aGUgcmVh bHRlawpkcml2ZXIgY2FuIChhbmQgZG9lcykgb3ZlcnJpZGUgdGhpcyBhY2NvcmRpbmcgdG8gdGhl IHBoeS1tb2RlIHByb3BlcnR5LgpUaHVzIGhhcmR3YXJlIHN0cmFwcGluZyBtYWtlcyBubyBkaWZm ZXJlbmNlIHRvIExpbnV4LgoKU28sIHdoYXQgd2UgZ2V0IGF0IHRoZSBSVEw4MjExRiBQSFkgaXM6 CgoJcGh5LW1vZGUJcmVjZWl2ZSBjbG9jayBkZWxheQl0cmFuc21pdCBjbG9jayBkZWxheQoJInJn bWlpIgkJMG5zCQkJMG5zCgkicmdtaWktcnhpZCIJMm5zCQkJMG5zCgkicmdtaWktdHhpZCIJMG5z CQkJMm5zCgkicmdtaWktaWQiCTJucwkJCTJucwoKaXJyZXNwZWN0aXZlIG9mIFJYRExZIC8gVFhE TFkgaGFyZHdhcmUgc3RyYXBwaW5nLgoKPiA+IFRoZSB0eF9kZWxheSBhbmQgcnhfZGVsYXkgdmFs dWVzIHdlcmUgb2J0YWluZWQgdXNpbmcgUm9ja2NoaXAncwo+ID4gYXV0b21hdGljIHNjYW5uaW5n IHRvb2w6Cj4gPiBodHRwczovL2dpdGh1Yi5jb20vaXN0b3Jlb3MvaXN0b3Jlb3MvYmxvYi81NDc0 NmRmZGI1YmQzNGQxZjI4MWNmNDFkMWQxNjIwZDBjM2VlNjg2L3RhcmdldC9saW51eC9yb2NrY2hp cC9maWxlcy9kcml2ZXJzL25ldC9ldGhlcm5ldC9zdG1pY3JvL3N0bW1hYy9kd21hYy1yay10b29s LmMKPiA+IGh0dHBzOi8vZ2l0bGFiLmNvbS9maXJlZmx5LWxpbnV4L2RvY3MvLS9ibG9iL3JrMzU2 eC9maXJlZmx5L0NvbW1vbi9HTUFDL1JvY2tjaGlwX0RldmVsb3Blcl9HdWlkZV9MaW51eF9HTUFD X1JHTUlJX0RlbGF5bGluZV9FTi5wZGYKPiA+IGh0dHBzOi8vZ2l0aHViLmNvbS9heGxyb3NlL3Jr ZG9jcy9ibG9iL21haW4vQ29tbW9uL0dNQUMvUm9ja2NoaXBfRGV2ZWxvcGVyX0d1aWRlX0xpbnV4 X0dNQUNfUkdNSUlfRGVsYXlsaW5lX0VOLnBkZgo+IAo+IFZlbmRvcnMgZ2V0IHRoaW5ncyB3cm9u ZywgaW5jbHVkaW5nIHRoaXMuICdyZ21paScgbWVhbnMgdGhlIFBDQiBhZGRzCj4gdGhlIDJucyBk ZWxheS4gTmVhcmx5IGV2ZXJ5IFJvY2tjaGlwIGJvYXJkIGZvbGxvd3MgUm9ja2NoaXAgYnJva2Vu Cj4gdmVuZG9yIHJlY29tbWVuZGF0aW9ucywgYW5kIHRoZW4gaSBjb21lIGFsb25nLCBwb2ludCBv dXQgaG93IGl0IGlzCj4gd3JvbmcsIGFuZCBhc2sgZm9yIGl0IHRvIGJlIGZpeGVkLCBiZWZvcmUg YmVpbmcgbWVyZ2VkIHRvIE1haW5saW5lLgoKQ2FuIHdlIGF0IGxlYXN0IGdldCB0aGUgInR4X2Rl bGF5IiBhbmQgInJ4X2RlbGF5IiBEVCBwcm9wZXJ0aWVzICh3aGljaAphcmUgcmVnaXN0ZXIgdmFs dWVzKSBwcm9wZXJseSBkb2N1bWVudGVkIGluIHRoZSBEVCBiaW5kaW5nIGRvY3VtZW50PwpJIGtu b3cgZnJvbSB0aGUgZHJpdmVyIGNvZGUgdGhhdCBhIHZhbHVlIG9mIDAgbWVhbnMgIm5vIGRlbGF5 Ii4gT3RoZXIKdmFsdWVzIGFkZCBhbiB1bnNwZWNpZmllZCBkZWxheSAtIGl0IGlzIG5vdCBvYnZp b3VzIHdoYXQgYW55IG5vbi16ZXJvCnZhbHVlIG1lYW5zLCBvciB3aGF0IHRoZSBkZWZhdWx0IG1l YW5zLgoKVGhpcyB3b3VsZCBoZWxwIHVzIHVuZGVyc3RhbmQgd2hhdCB2YWx1ZXMgc3VjaCBhczoK Cgl0eF9kZWxheSA9IDB4M2Mgb3IgMHg0ZgoKYW5kCgoJcnhfZGVsYXkgPSAweDJmIG9yIDB4MjYK CmFjdHVhbGx5IG1lYW4gaW4gdGVybXMgb2YgdGhlIHJlc3VsdGluZyBkZWxheSBhdCB0aGUgTUFD LgoKLS0gClJNSydzIFBhdGNoIHN5c3RlbTogaHR0cHM6Ly93d3cuYXJtbGludXgub3JnLnVrL2Rl dmVsb3Blci9wYXRjaGVzLwpGVFRQIGlzIGhlcmUhIDgwTWJwcyBkb3duIDEwTWJwcyB1cC4gRGVj ZW50IGNvbm5lY3Rpdml0eSBhdCBsYXN0IQoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX18KTGludXgtcm9ja2NoaXAgbWFpbGluZyBsaXN0CkxpbnV4LXJvY2tj aGlwQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1h bi9saXN0aW5mby9saW51eC1yb2NrY2hpcAo=