Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756124AbcCUODC (ORCPT ); Mon, 21 Mar 2016 10:03:02 -0400 Received: from mx07-00178001.pphosted.com ([62.209.51.94]:24736 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755942AbcCUOC6 (ORCPT ); Mon, 21 Mar 2016 10:02:58 -0400 Message-ID: <56EFFEEC.1010407@st.com> Date: Mon, 21 Mar 2016 15:02:20 +0100 From: Giuseppe CAVALLARO User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: Alexandre Torgue , Chen-Yu Tsai CC: Maxime Coquelin , netdev , devicetree , Joachim Eastwood , linux-kernel , linux-arm-kernel Subject: Re: [PATCH v5 2/4] Documentation: Bindings: Add STM32 DWMAC glue References: <1458315428-10081-1-git-send-email-alexandre.torgue@gmail.com> <1458315428-10081-3-git-send-email-alexandre.torgue@gmail.com> In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.52.139.48] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-03-21_07:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3186 Lines: 84 On 3/21/2016 11:45 AM, Alexandre Torgue wrote: > Hi, > > 2016-03-18 17:00 GMT+01:00 Chen-Yu Tsai : >> Hi, >> >> On Fri, Mar 18, 2016 at 11:37 PM, Alexandre TORGUE >> wrote: >>> Signed-off-by: Alexandre TORGUE >>> >>> diff --git a/Documentation/devicetree/bindings/net/stm32-dwmac.txt b/Documentation/devicetree/bindings/net/stm32-dwmac.txt >>> new file mode 100644 >>> index 0000000..ada2aa4 >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/net/stm32-dwmac.txt >>> @@ -0,0 +1,32 @@ >>> +STMicroelectronics STM32 / MCU DWMAC glue layer controller >>> + >>> +This file documents platform glue layer for stmmac. >>> +Please see stmmac.txt for the other unchanged properties. >>> + >>> +The device node has following properties. >>> + >>> +Required properties: >>> +- compatible: Should be "st,stm32-dwmac" to select glue, and >>> + "snps,dwmac-3.50a" to select IP vesrion. Almost all the synp gmac chips have the HW capability register that is used for setting all the parameters at probe time. This will override fields passed from DT. In theory, it is not necessary to pass: "snps,dwmac-3.50a" from device tree at least there is either no HW cap reg or the glue has some w/a for a specific chip revision. To be honest, I like to see the "snps,dwmac-3.50a" as compatibility to also have a better readability (that's my personal view ;-) ). Peppe >> >> If you need have sort of hardware glue, then it is not compatible. >> > > We could have the case where the glue is set by a bootloader. > In this case, we will select IP version in compatible and we will use > generic dwmac glue to probe stmmac driver. > > Regards > > Alex. > >> ChenYu >> >>> +- clocks: Must contain a phandle for each entry in clock-names. >>> +- clock-names: Should be "stmmaceth" for the host clock. >>> + Should be "tx-clk" for the MAC TX clock. >>> + Should be "rx-clk" for the MAC RX clock. >>> +- st,syscon : Should be phandle/offset pair. The phandle to the syscon node which >>> + encompases the glue register, and the offset of the control register. >>> +Example: >>> + >>> + ethernet0: dwmac@40028000 { >>> + compatible = "st,stm32-dwmac", "snps,dwmac-3.50a"; >>> + status = "disabled"; >>> + reg = <0x40028000 0x8000>; >>> + reg-names = "stmmaceth"; >>> + interrupts = <0 61 0>, <0 62 0>; >>> + interrupt-names = "macirq", "eth_wake_irq"; >>> + clock-names = "stmmaceth", "tx-clk", "rx-clk"; >>> + clocks = <&rcc 0 25>, <&rcc 0 26>, <&rcc 0 27>; >>> + st,syscon = <&syscfg 0x4>; >>> + snps,pbl = <8>; >>> + snps,mixed-burst; >>> + dma-ranges; >>> + }; >>> -- >>> 1.9.1 >>> >>> >>> _______________________________________________ >>> linux-arm-kernel mailing list >>> linux-arm-kernel@lists.infradead.org >>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > >