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 48557C3DA7F for ; Mon, 5 Aug 2024 15:09:29 +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-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=GKfjloD6oa4JOXSe00nlirkRPmxpIJuJ9zLXTqSQAPI=; b=Cdm5K8UkV6/HLgLrwRDRyYmEuE odZSHLKTM92+14WhYYB/iRTizh5FP9clgekmgcwJHDG4tjuafewIEJoP31EmgLLoR/wWiD8U6yT2Y xXOcGTi6vrR/750FgS/XNzGUoOVJ88Pjl9saMJqlrdw2t5SUdiVU8j1rVSd/NHy3NK6wLMAx0sCR3 ukYpdXTWmG9xQWPsI0Mo/uxAwIhs4OujsMFODNooRUjazB/WOUTqnk72B7kMHlw/t4KPA/ApE+boi lWm85FU9aFySQ6Tu+bNNK1hvFWbyKzl1pSpFD/+oKcIZ00GDvwJCWxnU6T/as8aCav5Zhcf4d8/xc VGMik7Lw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sazKn-0000000GG4H-2RbJ; Mon, 05 Aug 2024 15:09:17 +0000 Received: from pandora.armlinux.org.uk ([2001:4d48:ad52:32c8:5054:ff:fe00:142]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sazKG-0000000GFy3-31Dz for linux-arm-kernel@lists.infradead.org; Mon, 05 Aug 2024 15:08:46 +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-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding: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=GKfjloD6oa4JOXSe00nlirkRPmxpIJuJ9zLXTqSQAPI=; b=ViGl2BkL5r4BIMOR6jnI4uLV52 VePlXnOarDVS1Nx3+Pes61PGKOmZNyyrQz4PxJrNzDyum7mAwZyrOEREG4J/zrFnA7BP4dDRBCI04 vVXWyHRvdlFKnPFIMZggeKkRwdxGKYYU++s25DqQb6jNFr7CJI7tMM/PlLO+zEBQmXZirY/8I/pEG qB1SGx8OXmgLlX7G1i+9ubCGs1XS7Sg8bh5/k9bmHKEgaLn8OzqO04FCKMETecwKjB+zqSvgf8edQ 80dQZXD3t6uZSkyFrBnE3UF/GSXGvFSQMon3rakHzukhg3h0tJ7F45Iuwk1C9L+l440iOt5FQZsRO 2n6SCCcg==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:39576) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1sazK3-0003Fw-2D; Mon, 05 Aug 2024 16:08:31 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1sazK6-0002S7-0D; Mon, 05 Aug 2024 16:08:34 +0100 Date: Mon, 5 Aug 2024 16:08:33 +0100 From: "Russell King (Oracle)" To: "Jan Petrous (OSS)" Cc: Maxime Coquelin , Alexandre Torgue , dl-S32 , "linux-kernel@vger.kernel.org" , "linux-stm32@st-md-mailman.stormreply.com" , "linux-arm-kernel@lists.infradead.org" , Claudiu Manoil , "netdev@vger.kernel.org" Subject: Re: [PATCH 4/6] net: stmmac: dwmac-s32cc: add basic NXP S32G/S32R glue Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240805_080844_784364_ABC6EACC X-CRM114-Status: GOOD ( 20.93 ) 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 Sun, Aug 04, 2024 at 08:50:10PM +0000, Jan Petrous (OSS) wrote: > diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig > index 05cc07b8f48c..31628c363d71 100644 > --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig > +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig > @@ -153,6 +153,17 @@ config DWMAC_RZN1 > This selects the Renesas RZ/N1 SoC glue layer support for > the stmmac device driver. This support can make use of a custom MII > converter PCS device. There should be a blank line here. > +config DWMAC_S32CC > + tristate "NXP S32G/S32R GMAC support" > + default ARCH_S32 > + depends on OF && (ARCH_S32 || COMPILE_TEST) ... > +static void s32cc_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode) > +{ > + struct s32cc_priv_data *gmac = priv; > + int ret; > + > + if (!gmac->rx_clk_enabled) { > + ret = clk_prepare_enable(gmac->rx_clk); > + if (ret) { > + dev_err(gmac->dev, "Can't set rx clock\n"); > + return; > + } > + dev_dbg(gmac->dev, "rx clock enabled\n"); > + gmac->rx_clk_enabled = true; > + } > + > + switch (speed) { > + case SPEED_1000: > + dev_dbg(gmac->dev, "Set tx clock to 125M\n"); > + ret = clk_set_rate(gmac->tx_clk, GMAC_TX_RATE_125M); > + break; > + case SPEED_100: > + dev_dbg(gmac->dev, "Set tx clock to 25M\n"); > + ret = clk_set_rate(gmac->tx_clk, GMAC_TX_RATE_25M); > + break; > + case SPEED_10: > + dev_dbg(gmac->dev, "Set tx clock to 2.5M\n"); > + ret = clk_set_rate(gmac->tx_clk, GMAC_TX_RATE_2M5); > + break; > + default: > + dev_err(gmac->dev, "Unsupported/Invalid speed: %d\n", speed); > + return; > + } > + We seem to have multiple cases of very similar logic in lots of stmmac platform drivers, and I think it's about time we said no more to this. So, what I think we should do is as follows: add the following helper - either in stmmac, or more generically (phylib? - in which case its name will need changing.) static long stmmac_get_rgmii_clock(int speed) { switch (speed) { case SPEED_10: return 2500000; case SPEED_100: return 25000000; case SPEED_1000: return 125000000; default: return -ENVAL; } } Then, this can become: long tx_clk_rate; ... tx_clk_rate = stmmac_get_rgmii_clock(speed); if (tx_clk_rate < 0) { dev_err(gmac->dev, "Unsupported/Invalid speed: %d\n", speed); return; } ret = clk_set_rate(gmac->tx_clk, tx_clk_rate); > + if (ret) > + dev_err(gmac->dev, "Can't set tx clock\n"); > +} > + > +static int s32cc_dwmac_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct plat_stmmacenet_data *plat; > + struct s32cc_priv_data *gmac; > + struct stmmac_resources res; > + int ret; > + > + gmac = devm_kzalloc(&pdev->dev, sizeof(*gmac), GFP_KERNEL); > + if (!gmac) > + return PTR_ERR(gmac); > + > + gmac->dev = &pdev->dev; > + > + ret = stmmac_get_platform_resources(pdev, &res); > + if (ret) > + return dev_err_probe(dev, ret, > + "Failed to get platform resources\n"); > + > + plat = devm_stmmac_probe_config_dt(pdev, res.mac); > + if (IS_ERR(plat)) > + return dev_err_probe(dev, PTR_ERR(plat), > + "dt configuration failed\n"); > + > + /* PHY interface mode control reg */ > + gmac->ctrl_sts = devm_platform_get_and_ioremap_resource(pdev, 1, NULL); > + if (IS_ERR_OR_NULL(gmac->ctrl_sts)) > + return dev_err_probe(dev, PTR_ERR(gmac->ctrl_sts), > + "S32CC config region is missing\n"); Testing with IS_ERR() is all that's required here. Thanks. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!