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[79.139.233.37]) by smtp.googlemail.com with ESMTPSA id u21sm2041632ljl.93.2019.12.11.18.17.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Dec 2019 18:17:11 -0800 (PST) Subject: Re: [PATCH v3 09/15] ASoC: tegra: Add fallback for audio mclk To: Mark Brown Cc: robh+dt@kernel.org, mark.rutland@arm.com, Sowjanya Komatineni , thierry.reding@gmail.com, jonathanh@nvidia.com, mperttunen@nvidia.com, gregkh@linuxfoundation.org, sboyd@kernel.org, tglx@linutronix.de, allison@lohutok.net, pdeschrijver@nvidia.com, pgaikwad@nvidia.com, mturquette@baylibre.com, horms+renesas@verge.net.au, Jisheng.Zhang@synaptics.com, krzk@kernel.org, arnd@arndb.de, spujar@nvidia.com, josephl@nvidia.com, vidyas@nvidia.com, daniel.lezcano@linaro.org, mmaddireddy@nvidia.com, markz@nvidia.com, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, lgirdwood@gmail.com, perex@perex.cz, tiwai@suse.com, alexios.zavras@intel.com, alsa-devel@alsa-project.org References: <1575600535-26877-1-git-send-email-skomatineni@nvidia.com> <1575600535-26877-10-git-send-email-skomatineni@nvidia.com> <20191209164027.GG5483@sirena.org.uk> <7fe879fd-dae3-1e64-1031-cd9f00e31552@gmail.com> <20191209204735.GK5483@sirena.org.uk> <560185d9-32fd-a85e-5feb-105f79b953c6@gmail.com> <20191210185933.GJ6110@sirena.org.uk> From: Dmitry Osipenko Message-ID: <17cb9e87-e1bd-93a0-aa9c-0f30c2263ec0@gmail.com> Date: Thu, 12 Dec 2019 05:17:10 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: <20191210185933.GJ6110@sirena.org.uk> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org 10.12.2019 21:59, Mark Brown пишет: > On Tue, Dec 10, 2019 at 09:24:43PM +0300, Dmitry Osipenko wrote: > >> In some cases it could be painful to maintain device-tree compatibility >> for platforms like NVIDIA Tegra SoCs because hardware wasn't modeled >> correctly from the start. > >> I agree that people should use relevant device-trees. It's quite a lot >> of hassle to care about compatibility for platforms that are permanently >> in a development state. It could be more reasonable to go through the >> pain if kernel required a full-featured device tree for every SoC from >> the start. > > We absolutely should support the newer kernel with older device tree > case, what's less clear to me is the new device tree with old kernel > which is applying LTS updates case. That does seem incredibly > specialist - I'd honestly never heard of people doing that before this > thread. > There was a precedent in the past [1]. [1] https://lkml.org/lkml/2018/8/20/497