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([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