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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B5E5C433FE for ; Thu, 20 Oct 2022 08:15:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231245AbiJTIPa (ORCPT ); Thu, 20 Oct 2022 04:15:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39434 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231235AbiJTIPZ (ORCPT ); Thu, 20 Oct 2022 04:15:25 -0400 Received: from mail-wm1-x331.google.com (mail-wm1-x331.google.com [IPv6:2a00:1450:4864:20::331]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D6DFAA3A9B for ; Thu, 20 Oct 2022 01:15:20 -0700 (PDT) Received: by mail-wm1-x331.google.com with SMTP id r8-20020a1c4408000000b003c47d5fd475so1723143wma.3 for ; Thu, 20 Oct 2022 01:15:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:in-reply-to:organization:references:cc:to :content-language:subject:reply-to:from:user-agent:mime-version:date :message-id:from:to:cc:subject:date:message-id:reply-to; bh=mhEUUAx17h0AgHtxJMeCII0Aci1ZEeSL8jXNszOE9M4=; b=SGMXowYozhs41yaXnsLn+6I8DWByS05nCpogBo/gSwiquuK9eqEsbVsWuQKQ+Q9KbU Xvss5cdXVqIKC6wayAtZhK+eUKPYcyLjmj/OI2zfTMFSPCeIx+At6NyPkoCePWzDRv7R V6y1pr2HzjZfkl0uSjYyyuVTnxTuLHekFSLJiZlRBO6wOWKPtJBmSxVjKeoC1Q+K4Z5Y 2DsaXTJQ6Fpp/TXwYnlXRmsgd57l07vJySEOZ4HahHdfHdqa5p/uC7p8dCBm1yH7KyQy VYUDRgOWFYZA2CtSK+m0gjZ9fUym8nA8Rz5givWgXosqDLZHBAycT7Wvc6Xh5dFvtvUl MeSA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:in-reply-to:organization:references:cc:to :content-language:subject:reply-to:from:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=mhEUUAx17h0AgHtxJMeCII0Aci1ZEeSL8jXNszOE9M4=; b=vkNNZdtxZ/AgOBWLRIIxe6YNj8QCp3yXmZXqWrcXq+TWcDDkppRHND+PqaDXNx4CU0 xzLv3dk990V6j9DC0vLekI9ivfnpk0N7G2hmaDw4CNz8fm/9tV9/x9/TbZxoHK9y2SNi WDtxLhSPnUDqT2xMKCLxWGR/srNlr6aWC0/8IFa5swBpM6l6NH9xw0gtWXf7rNMxvNxC ktlObTbNH963+H5XjmKSmmmEC6M7Bswg9EwWFR/V6TlXz3xh8jYkBhWd/lqil9lQ2eqn UhjF2+lGJwK1yUzIvAaJVdpDjHJo3KSGOHwzYb65AbzxJebu5SLzMJBV3zcRpoLzGpk+ YeAg== X-Gm-Message-State: ACrzQf08XuPwoqxft7Qj/l8csyQ4i6+HW8qyqxnSUWxaTP+zsCU0j2wH 2Qb+s+mxwtdTG+WpU0Leev8L3a2laHK3KaPu X-Google-Smtp-Source: AMsMyM6+QEGDiYr4HnFQpx2CtydwueOIIFGgcqt8YVmO8d/ISMyk+foSu6EsTOXeeBSJYJr/u3e+Mg== X-Received: by 2002:a7b:c455:0:b0:3c6:bd0e:f9b0 with SMTP id l21-20020a7bc455000000b003c6bd0ef9b0mr29253450wmi.21.1666253719306; Thu, 20 Oct 2022 01:15:19 -0700 (PDT) Received: from ?IPV6:2a01:e0a:982:cbb0:ef2:f28d:311f:c84b? ([2a01:e0a:982:cbb0:ef2:f28d:311f:c84b]) by smtp.gmail.com with ESMTPSA id q6-20020a7bce86000000b003b3365b38f9sm2127648wmj.10.2022.10.20.01.15.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Oct 2022 01:15:18 -0700 (PDT) Message-ID: <6696b644-bb9d-54e4-0b3b-e4897a881898@linaro.org> Date: Thu, 20 Oct 2022 10:15:17 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.1 From: neil.armstrong@linaro.org Reply-To: neil.armstrong@linaro.org Subject: Re: [PATCH] arm64: dts: meson: Enable active coling using gpio-fan on Odroid N2/N2+ Content-Language: en-US To: Martin Blumenstingl , Anand Moon Cc: Rob Herring , Krzysztof Kozlowski , Kevin Hilman , Jerome Brunet , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org References: <20221018195122.8877-1-linux.amoon@gmail.com> <402500e8-b4fe-9b8f-d634-e329191af1b8@linaro.org> Organization: Linaro Developer Services In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 19/10/2022 22:40, Martin Blumenstingl wrote: > Hi Anand, > > On Wed, Oct 19, 2022 at 7:17 PM Anand Moon wrote: > [...] >>>> +&pwm_AO_ab { >>> >>> &pwm_AO_cd not _ab >>> >> No it has a conflict with CPU_B (vddcpu_b) PWM > Uh, you're right. That's probably why the Hardkernel team uses a > software based PWM implementation: [0] > In hindsight they should have used a different pad either for VDDCPU_B > or the fan. > > I think the most pragmatic approach (since the "GPIO PWM" driver is > not upstream and I don't know if something like that would be accepted > upstream) is to use a GPIO based fan as you did in your initial patch. > Not sure what others think though. > Indeed I recall them using a SW pwm. Yes it's perfectly ok to use a gpio-fan. Anand, please fixup the ddr-active name and send a v2. Thanks, Neil > > Best regards, > Martin > > > [0] https://github.com/hardkernel/linux/blob/c109dec94e7e819554830acfac4b6ed96e230179/arch/arm64/boot/dts/amlogic/meson64_odroidn2.dtsi#L356-L359 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 7F183C4332F for ; Thu, 20 Oct 2022 08:16:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:Reply-To:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:References:Cc:To:Subject: From:MIME-Version:Date:Message-ID:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=UNJWPm/W3TCIdH2cRlEST/4ymt7p4mkOhTrcdLjYgB0=; b=HIgAfcbjJ8bqWaD8ivmNYmJ/GS ZXUuFXEy9AmWnVPOAOy/H8nSZx9QdHo9gbD5Mk/4IkHv/3NzsMnmU8uB2wwm3RgIbM4s/1oLV5yvZ gCdVThJ6teTYVQsp13L2hU5no+7KBHZgyydwyW//cG34dpp0oAbqH2KbnUzK2YE11qgqyyiRHtTEF yARcx+D554Bogot+AL7YWziDOezYlGEXd08d5k6bJ3zVWs2jYV+NsD0CgQ5rbS77/xkWMNISCgDxE 7W+S5SHVwDj6CzsL0a9Xo6cstxL63UZ019R8Tfn49Xn0AMJIplsw9L0cveqIhDWHiJyc9sRClcwnj EKygNPew==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1olQi5-00C77Y-V3; Thu, 20 Oct 2022 08:15:26 +0000 Received: from mail-wm1-x32c.google.com ([2a00:1450:4864:20::32c]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1olQi3-00C76P-7A for linux-arm-kernel@lists.infradead.org; Thu, 20 Oct 2022 08:15:24 +0000 Received: by mail-wm1-x32c.google.com with SMTP id c3-20020a1c3503000000b003bd21e3dd7aso1737913wma.1 for ; Thu, 20 Oct 2022 01:15:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:in-reply-to:organization:references:cc:to :content-language:subject:reply-to:from:user-agent:mime-version:date :message-id:from:to:cc:subject:date:message-id:reply-to; bh=mhEUUAx17h0AgHtxJMeCII0Aci1ZEeSL8jXNszOE9M4=; b=SGMXowYozhs41yaXnsLn+6I8DWByS05nCpogBo/gSwiquuK9eqEsbVsWuQKQ+Q9KbU Xvss5cdXVqIKC6wayAtZhK+eUKPYcyLjmj/OI2zfTMFSPCeIx+At6NyPkoCePWzDRv7R V6y1pr2HzjZfkl0uSjYyyuVTnxTuLHekFSLJiZlRBO6wOWKPtJBmSxVjKeoC1Q+K4Z5Y 2DsaXTJQ6Fpp/TXwYnlXRmsgd57l07vJySEOZ4HahHdfHdqa5p/uC7p8dCBm1yH7KyQy VYUDRgOWFYZA2CtSK+m0gjZ9fUym8nA8Rz5givWgXosqDLZHBAycT7Wvc6Xh5dFvtvUl MeSA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:in-reply-to:organization:references:cc:to :content-language:subject:reply-to:from:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=mhEUUAx17h0AgHtxJMeCII0Aci1ZEeSL8jXNszOE9M4=; b=kFhXiw4COWgV5k3kMRpcsl/6JfRlacmjvlUNAtBUUTWKThMgEJlVePnEfYv3XXU/Lb 0QwA2lbcaUP2hj2D9vXXraKtrcJdFQgUN5M6qQAHg6cqnC3dYq8jXi5mldiXJPOb4ZS7 gWK58IYyFw5HzzUso0eBHbKW0xGJgCO4/qC83TZuPyJsMKpXKJ5PU8meWeoHdsGMI1ni 3JdyDD7czs9NI590y5fG2O+n4UK7IOJE+RMP0mcW8fdXIzUxnX+DzBn4JFB5BNIhhnU2 N1ZIZEJ0b9u6OnN1znAroamwOm+xn/ltp6WDZZB/C61Vug1P3+Sp2CGBycUryWvRvrt5 eCDg== X-Gm-Message-State: ACrzQf0MNvZK0KlwCee8JzvFq+NKUGmQ4kmSre9j6jdnix8DOpOXDn0B JAZTL9r+ITF4KlsFmcMiada3qA== X-Google-Smtp-Source: AMsMyM6+QEGDiYr4HnFQpx2CtydwueOIIFGgcqt8YVmO8d/ISMyk+foSu6EsTOXeeBSJYJr/u3e+Mg== X-Received: by 2002:a7b:c455:0:b0:3c6:bd0e:f9b0 with SMTP id l21-20020a7bc455000000b003c6bd0ef9b0mr29253450wmi.21.1666253719306; Thu, 20 Oct 2022 01:15:19 -0700 (PDT) Received: from ?IPV6:2a01:e0a:982:cbb0:ef2:f28d:311f:c84b? ([2a01:e0a:982:cbb0:ef2:f28d:311f:c84b]) by smtp.gmail.com with ESMTPSA id q6-20020a7bce86000000b003b3365b38f9sm2127648wmj.10.2022.10.20.01.15.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Oct 2022 01:15:18 -0700 (PDT) Message-ID: <6696b644-bb9d-54e4-0b3b-e4897a881898@linaro.org> Date: Thu, 20 Oct 2022 10:15:17 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.1 From: neil.armstrong@linaro.org Subject: Re: [PATCH] arm64: dts: meson: Enable active coling using gpio-fan on Odroid N2/N2+ Content-Language: en-US To: Martin Blumenstingl , Anand Moon Cc: Rob Herring , Krzysztof Kozlowski , Kevin Hilman , Jerome Brunet , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org References: <20221018195122.8877-1-linux.amoon@gmail.com> <402500e8-b4fe-9b8f-d634-e329191af1b8@linaro.org> Organization: Linaro Developer Services In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221020_011523_269653_119D1C34 X-CRM114-Status: GOOD ( 17.17 ) 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: , Reply-To: neil.armstrong@linaro.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 19/10/2022 22:40, Martin Blumenstingl wrote: > Hi Anand, > > On Wed, Oct 19, 2022 at 7:17 PM Anand Moon wrote: > [...] >>>> +&pwm_AO_ab { >>> >>> &pwm_AO_cd not _ab >>> >> No it has a conflict with CPU_B (vddcpu_b) PWM > Uh, you're right. That's probably why the Hardkernel team uses a > software based PWM implementation: [0] > In hindsight they should have used a different pad either for VDDCPU_B > or the fan. > > I think the most pragmatic approach (since the "GPIO PWM" driver is > not upstream and I don't know if something like that would be accepted > upstream) is to use a GPIO based fan as you did in your initial patch. > Not sure what others think though. > Indeed I recall them using a SW pwm. Yes it's perfectly ok to use a gpio-fan. Anand, please fixup the ddr-active name and send a v2. Thanks, Neil > > Best regards, > Martin > > > [0] https://github.com/hardkernel/linux/blob/c109dec94e7e819554830acfac4b6ed96e230179/arch/arm64/boot/dts/amlogic/meson64_odroidn2.dtsi#L356-L359 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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 80CC9C433FE for ; Thu, 20 Oct 2022 08:15:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:Reply-To:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:References:Cc:To:Subject: From:MIME-Version:Date:Message-ID:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=m2IMTffaMkjCpAKZYPvNh+KBqZFCwHB8sgRKtDnwNXY=; b=s6IDTebz40ZA00gMx7bQNTUbIp KxZD6ASNa7ooe7pIxHfc5XUbRefhVICNR7OhpdOpAPOIzRIxMB4VCntEdSqS/jHZnAYtGITlBLOdD RzPcjOqTSyc7buDDc7OaYc3E/kg3c9wK4NKUN7hG8NmzQREUaCUleGe6PRIcqSRjZ8JNxlChCTqiI GtNOwu+o4Op2sjiN2wVp5eizaijrEYh7HgvcVxsEpHXDzMiC4Wj1/m+qZeTen0Hq9raw8xw4vaYqj iDSc8nzSFHQ850pQq7NNDgqjdAGxnA0jiNdC+45puv8Z3TSngZfelItGCt1QAFlWQFz+3vRO5f+B9 bF19378A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1olQi5-00C77S-AX; Thu, 20 Oct 2022 08:15:25 +0000 Received: from mail-wm1-x32e.google.com ([2a00:1450:4864:20::32e]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1olQi2-00C76Q-Sj for linux-amlogic@lists.infradead.org; Thu, 20 Oct 2022 08:15:24 +0000 Received: by mail-wm1-x32e.google.com with SMTP id 186-20020a1c02c3000000b003c6c154d528so1712349wmc.4 for ; Thu, 20 Oct 2022 01:15:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:in-reply-to:organization:references:cc:to :content-language:subject:reply-to:from:user-agent:mime-version:date :message-id:from:to:cc:subject:date:message-id:reply-to; bh=mhEUUAx17h0AgHtxJMeCII0Aci1ZEeSL8jXNszOE9M4=; b=SGMXowYozhs41yaXnsLn+6I8DWByS05nCpogBo/gSwiquuK9eqEsbVsWuQKQ+Q9KbU Xvss5cdXVqIKC6wayAtZhK+eUKPYcyLjmj/OI2zfTMFSPCeIx+At6NyPkoCePWzDRv7R V6y1pr2HzjZfkl0uSjYyyuVTnxTuLHekFSLJiZlRBO6wOWKPtJBmSxVjKeoC1Q+K4Z5Y 2DsaXTJQ6Fpp/TXwYnlXRmsgd57l07vJySEOZ4HahHdfHdqa5p/uC7p8dCBm1yH7KyQy VYUDRgOWFYZA2CtSK+m0gjZ9fUym8nA8Rz5givWgXosqDLZHBAycT7Wvc6Xh5dFvtvUl MeSA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:in-reply-to:organization:references:cc:to :content-language:subject:reply-to:from:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=mhEUUAx17h0AgHtxJMeCII0Aci1ZEeSL8jXNszOE9M4=; b=NAJDa9/Uy4IEOwYsCcuoIE+o1oexA7lgzY380OkZCdqHsOjyMYwJvyXEAF9VMXuZ6s w6Omqe15gpazgYYnIxZOjVpM6RMGfFIIoOUbYfN8D5lEC4odXzccORSrA/EwDw7gmfX5 h3+4ApMGb0f2cXeJ3KPdquB9xIAP5W7Tck2M5z8TD4dWVsc60GqcbiC6kzQCrmHbBHAO G+6+0tY0V/XReUJR8XS+ra9g4QRv1KWLfzN4p36il2E6yA6qBDE2L2+q1Bm44Qk8sNW5 QA+vW5RD6kZJEJnQWGtDL6omePKTpjGE+xy/O99rnJ0VwxT7M8RFQ/OnIhGZprOabMNY xK7w== X-Gm-Message-State: ACrzQf19Ag+o8Fha6rB4iK2LbC0LACCXaAI142j4BdIPypQsGxVSna8a HovM9leeWLCE4z2nAIhfr5MhWQ== X-Google-Smtp-Source: AMsMyM6+QEGDiYr4HnFQpx2CtydwueOIIFGgcqt8YVmO8d/ISMyk+foSu6EsTOXeeBSJYJr/u3e+Mg== X-Received: by 2002:a7b:c455:0:b0:3c6:bd0e:f9b0 with SMTP id l21-20020a7bc455000000b003c6bd0ef9b0mr29253450wmi.21.1666253719306; Thu, 20 Oct 2022 01:15:19 -0700 (PDT) Received: from ?IPV6:2a01:e0a:982:cbb0:ef2:f28d:311f:c84b? ([2a01:e0a:982:cbb0:ef2:f28d:311f:c84b]) by smtp.gmail.com with ESMTPSA id q6-20020a7bce86000000b003b3365b38f9sm2127648wmj.10.2022.10.20.01.15.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Oct 2022 01:15:18 -0700 (PDT) Message-ID: <6696b644-bb9d-54e4-0b3b-e4897a881898@linaro.org> Date: Thu, 20 Oct 2022 10:15:17 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.1 From: neil.armstrong@linaro.org Subject: Re: [PATCH] arm64: dts: meson: Enable active coling using gpio-fan on Odroid N2/N2+ Content-Language: en-US To: Martin Blumenstingl , Anand Moon Cc: Rob Herring , Krzysztof Kozlowski , Kevin Hilman , Jerome Brunet , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org References: <20221018195122.8877-1-linux.amoon@gmail.com> <402500e8-b4fe-9b8f-d634-e329191af1b8@linaro.org> Organization: Linaro Developer Services In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221020_011522_976918_432D1FF8 X-CRM114-Status: GOOD ( 15.59 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: neil.armstrong@linaro.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org On 19/10/2022 22:40, Martin Blumenstingl wrote: > Hi Anand, > > On Wed, Oct 19, 2022 at 7:17 PM Anand Moon wrote: > [...] >>>> +&pwm_AO_ab { >>> >>> &pwm_AO_cd not _ab >>> >> No it has a conflict with CPU_B (vddcpu_b) PWM > Uh, you're right. That's probably why the Hardkernel team uses a > software based PWM implementation: [0] > In hindsight they should have used a different pad either for VDDCPU_B > or the fan. > > I think the most pragmatic approach (since the "GPIO PWM" driver is > not upstream and I don't know if something like that would be accepted > upstream) is to use a GPIO based fan as you did in your initial patch. > Not sure what others think though. > Indeed I recall them using a SW pwm. Yes it's perfectly ok to use a gpio-fan. Anand, please fixup the ddr-active name and send a v2. Thanks, Neil > > Best regards, > Martin > > > [0] https://github.com/hardkernel/linux/blob/c109dec94e7e819554830acfac4b6ed96e230179/arch/arm64/boot/dts/amlogic/meson64_odroidn2.dtsi#L356-L359 _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic