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smtp.gmail.com with ESMTPSA id g18sm6716001edh.39.2019.02.21.06.22.10 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Thu, 21 Feb 2019 06:22:11 -0800 (PST) Subject: Re: [PATCH v4 2/3] dt-bindings: i2c: Add Mediatek MT8183 i2c binding To: Qii Wang Cc: wsa@the-dreams.de, devicetree@vger.kernel.org, srv_heupstream@mediatek.com, robh@kernel.org, leilk.liu@mediatek.com, xinping.qian@mediatek.com, linux-kernel@vger.kernel.org, liguo.zhang@mediatek.com, linux-mediatek@lists.infradead.org, linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <1550666030-30211-1-git-send-email-qii.wang@mediatek.com> <1550666030-30211-3-git-send-email-qii.wang@mediatek.com> <1550755929.30363.26.camel@mhfsdcap03> From: Matthias Brugger Openpgp: preference=signencrypt Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata= mQINBFP1zgUBEAC21D6hk7//0kOmsUrE3eZ55kjc9DmFPKIz6l4NggqwQjBNRHIMh04BbCMY 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+lBjnyl624U8nnQWnA8PwJ2hI3DeQou1HypLFPeY9DfWv4xYdkyeOtGpueeBlqhtMoZ0kDw2 C3vzj77nWwBgpgn1Vpf4hG/sW/CRR6tuIQWWTvUM3ACa1pgEsBvIEBiVvPxyAtL+L+Lh1Sni 7w3HBk1EJvUAEQEAAYkCHwQYAQIACQUCU/YJEgIbDAAKCRDZFAuyVhMC8QndEACuN16mvivn WwLDdypvco5PF8w9yrfZDKW4ggf9TFVB9skzMNCuQc+tc+QM+ni2c4kKIdz2jmcg6QytgqVu m6V1OsNmpjADaQkVp5jL0tmg6/KA9Tvr07Kuv+Uo4tSrS/4djDjJnXHEp/tB+Fw7CArNtUtL lc8SuADCmMD+kBOVWktZyzkBkDfBXlTWl46T/8291lEspDWe5YW1ZAH/HdCR1rQNZWjNCpB2 Cic58CYMD1rSonCnbfUeyZYNNhNHZosl4dl7f+am87Q2x3pK0DLSoJRxWb7vZB0uo9CzCSm3 I++aYozF25xQoT+7zCx2cQi33jwvnJAK1o4VlNx36RfrxzBqc1uZGzJBCQu48UjmUSsTwWC3 HpE/D9sM+xACs803lFUIZC5H62G059cCPAXKgsFpNMKmBAWweBkVJAisoQeX50OP+/11ArV0 cv+fOTfJj0/KwFXJaaYh3LUQNILLBNxkSrhCLl8dUg53IbHx4NfIAgqxLWGfXM8DY1aFdU79 pac005PuhxCWkKTJz3gCmznnoat4GCnL5gy/m0Qk45l4PFqwWXVLo9AQg2Kp3mlIFZ6fsEKI AN5hxlbNvNb9V2Zo5bFZjPWPFTxOteM0omUAS+QopwU0yPLLGJVf2iCmItHcUXI+r2JwH1CJ jrHWeQEI2ucSKsNa8FllDmG/fQ== Message-ID: <5fec5fcb-95c5-e7f0-9cf3-d2a6d35b3dfd@gmail.com> Date: Thu, 21 Feb 2019 15:22:09 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 MIME-Version: 1.0 In-Reply-To: <1550755929.30363.26.camel@mhfsdcap03> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21/02/2019 14:32, Qii Wang wrote: > On Wed, 2019-02-20 at 16:25 +0100, Matthias Brugger wrote: >> >> On 20/02/2019 13:33, Qii Wang wrote: >>> Add MT8183 i2c binding to binding file. Compare to MT2712 i2c >>> controller, MT8183 has different registers, offsets, and clock. >>> >>> Signed-off-by: Qii Wang >>> --- >>> Documentation/devicetree/bindings/i2c/i2c-mtk.txt | 5 +++-- >>> 1 file changed, 3 insertions(+), 2 deletions(-) >>> >>> diff --git a/Documentation/devicetree/bindings/i2c/i2c-mtk.txt b/Documentation/devicetree/bindings/i2c/i2c-mtk.txt >>> index ee4c324..da2fa60 100644 >>> --- a/Documentation/devicetree/bindings/i2c/i2c-mtk.txt >>> +++ b/Documentation/devicetree/bindings/i2c/i2c-mtk.txt >>> @@ -12,14 +12,15 @@ Required properties: >>> "mediatek,mt7623-i2c", "mediatek,mt6577-i2c": for MediaTek MT7623 >>> "mediatek,mt7629-i2c", "mediatek,mt2712-i2c": for MediaTek MT7629 >>> "mediatek,mt8173-i2c": for MediaTek MT8173 >>> + "mediatek,mt8183-i2c": for MediaTek MT8183 >>> - reg: physical base address of the controller and dma base, length of memory >>> mapped region. >>> - interrupts: interrupt number to the cpu. >>> - clock-div: the fixed value for frequency divider of clock source in i2c >>> module. Each IC may be different. >>> - clocks: clock name from clock manager >>> - - clock-names: Must include "main" and "dma", if enable have-pmic need include >>> - "pmic" extra. >>> + - clock-names: Must include "main" and "dma", "arb" is optional, if enable >>> + have-pmic need include "pmic" extra. >> >> You have to mention that the arb clock is only necessary for mt8183. >> > > Arb clock is not only necessary for mt8183. When two i2c controllers are > internally connected to the same GPIO pins, the arb clock is needed to > ensure that the waveforms do not interfere with each other. > Maybe ""arb" is for multi-master" is better. Not all i2c controller have > multi-master. > Ok, that's value information. I propose to put that into the commit message where you add arb clock to the driver. In any case, the binding description should have this information. As you said, not all i2c controller have multi-master mode, so we don't need arb clock for all controllers. Regards, Matthias >>> >>> Optional properties: >>> - clock-frequency: Frequency in Hz of the bus when transfer, the default value >>> > >