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Message-ID: <fecb2dd6-9be2-78dc-4598-cc338fbdc2a2@linaro.org> Date: Thu, 24 Nov 2022 14:24:10 +0100 From: Neil Armstrong <neil.armstrong@...aro.org> To: Linus Walleij <linus.walleij@...aro.org>, Abel Vesa <abel.vesa@...aro.org> Cc: Andy Gross <agross@...nel.org>, Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org, "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org> Subject: Re: [PATCH v2 2/4] dt-bindings: pinctrl: qcom,tlmm-common: document i2c pull property Hi Linus, On 24/11/2022 14:11, Linus Walleij wrote: > On Wed, Nov 23, 2022 at 4:20 PM Abel Vesa <abel.vesa@...aro.org> wrote: > >> From: Neil Armstrong <neil.armstrong@...aro.org> >> >> Document the new i2c_pull property introduced for SM8550 setting >> an I2C specific pull mode on I2C able pins. >> >> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org> >> Signed-off-by: Abel Vesa <abel.vesa@...aro.org> > (...) >> + qcom,i2c-pull: >> + type: boolean >> + description: enable bias pull feature designed for I2C on pin > > But what is this? > > I2C buses are usually just plain old bias-high-impedance, high-z > or open drain, wire-or or whatever you want to call it. > > But now there is some special i2c mode, huh? > > The description is pretty much "it is what it is"... can we have > some explanation about what this means electrically speaking > and why you cannot use bias-high-impedance? I'll try to get some more info, but so far I only found what I wrote in the bindings. Neil > > Yours, > Linus Walleij
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