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[109.252.170.211]) by smtp.googlemail.com with ESMTPSA id g26sm191627ljl.116.2020.09.30.08.53.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 30 Sep 2020 08:53:07 -0700 (PDT) Subject: Re: [PATCH v3 1/3] memory: tegra: Add devm_tegra_get_memory_controller() To: Thierry Reding , Nicolin Chen References: <20200930084258.25493-1-nicoleotsuka@gmail.com> <20200930084258.25493-2-nicoleotsuka@gmail.com> <20200930152320.GA3833404@ulmo> From: Dmitry Osipenko Message-ID: Date: Wed, 30 Sep 2020 18:53:06 +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: <20200930152320.GA3833404@ulmo> Content-Language: en-US Cc: linux-kernel@vger.kernel.org, krzk@kernel.org, jonathanh@nvidia.com, iommu@lists.linux-foundation.org, linux-tegra@vger.kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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[109.252.170.211]) by smtp.googlemail.com with ESMTPSA id g26sm191627ljl.116.2020.09.30.08.53.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 30 Sep 2020 08:53:07 -0700 (PDT) Subject: Re: [PATCH v3 1/3] memory: tegra: Add devm_tegra_get_memory_controller() To: Thierry Reding , Nicolin Chen Cc: joro@8bytes.org, krzk@kernel.org, vdumpa@nvidia.com, jonathanh@nvidia.com, linux-tegra@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org References: <20200930084258.25493-1-nicoleotsuka@gmail.com> <20200930084258.25493-2-nicoleotsuka@gmail.com> <20200930152320.GA3833404@ulmo> From: Dmitry Osipenko Message-ID: Date: Wed, 30 Sep 2020 18:53:06 +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: <20200930152320.GA3833404@ulmo> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org 30.09.2020 18:23, Thierry Reding пишет: > On Wed, Sep 30, 2020 at 01:42:56AM -0700, Nicolin Chen wrote: >> From: Dmitry Osipenko >> >> Multiple Tegra drivers need to retrieve Memory Controller and hence there >> is quite some duplication of the retrieval code among the drivers. Let's >> add a new common helper for the retrieval of the MC. >> >> Signed-off-by: Dmitry Osipenko >> Signed-off-by: Nicolin Chen >> --- >> >> Changelog >> v2->v3: >> * Replaced with Dimtry's devm_tegra_get_memory_controller() >> v1->v2: >> * N/A >> >> drivers/memory/tegra/mc.c | 39 +++++++++++++++++++++++++++++++++++++++ >> include/soc/tegra/mc.h | 17 +++++++++++++++++ >> 2 files changed, 56 insertions(+) > > Let's not add this helper, please. If a device needs a reference to the > memory controller, it should have a phandle to the memory controller in > device tree so that it can be looked up explicitly. > > Adding this helper is officially sanctioning that it's okay not to have > that reference and that's a bad idea. And please explain why it's a bad idea, I don't see anything bad here at all.