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[109.252.193.186]) by smtp.googlemail.com with ESMTPSA id c4sm272462lfm.294.2020.10.27.12.38.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 27 Oct 2020 12:38:57 -0700 (PDT) Subject: Re: [PATCH v6 32/52] memory: tegra20-emc: Continue probing if timings are missing in device-tree To: Thierry Reding Cc: Jonathan Hunter , Georgi Djakov , Rob Herring , Michael Turquette , Stephen Boyd , Peter De Schrijver , MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Mikko Perttunen , Viresh Kumar , Peter Geis , Nicolas Chauvet , Krzysztof Kozlowski , linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org References: <20201025221735.3062-1-digetx@gmail.com> <20201025221735.3062-33-digetx@gmail.com> <20201027135244.GM1822510@ulmo> From: Dmitry Osipenko Message-ID: <0c306309-6f49-cbac-99ce-6d956d5e910c@gmail.com> Date: Tue, 27 Oct 2020 22:38:56 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201027135244.GM1822510@ulmo> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org 27.10.2020 16:52, Thierry Reding пишет: > On Mon, Oct 26, 2020 at 01:17:15AM +0300, Dmitry Osipenko wrote: >> EMC driver will become mandatory after turning it into interconnect >> provider because interconnect users, like display controller driver, will >> fail to probe using newer device-trees that have interconnect properties. >> Thus make EMC driver to probe even if timings are missing in device-tree. > > Does it really have to be mandatory? Sounds like that's going to make it > unnecessarily complicated to merge all of this. Is it complicated to > make interconnect support optional in consumer drivers? Interconnect provider can't be optional if interconnect properties present in a device-tree because drivers that use ICC path will get -EPROBE_DEFER until ICC provider is registered. Older device-trees don't have ICC properties, and thus, the ICC users/consumers will get a dummy NULL ICC path in this case. I.e. ICC core handles this for us.