AuxXxilium/linux_dsm_epyc7002
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ARM: dts: ux500: Drop pulls on I2C buses

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The I2C block in the Ux500 uses internal pull-ups on the
SoC, in fact it has to: in HS mode, the I2C block will need
to autonomously take control over the pull-up line to do
its job. This can be clearly seen from the SoC manual which
states that the silicon has a line named "en_cspu_hs" which
enables current source pull-up for high speed mode. Another
hint is that the vendor code tree never enabled the pull
up on these lines, despite being deployed on boards that
lack external pull-up resistors.

Tested on the Ux500 reference designs without any problems.

Cc: Stephan Gerhold <stephan@gerhold.net>
Reported-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20191126123116.56244-1-linus.walleij@linaro.org
Reviewed-by: Stephan Gerhold <stephan@gerhold.net>
Tested-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2019-11-26 13:31:16 +01:00
parent b2ee587750
commit 27e7c033d3
1 changed files with 5 additions and 5 deletions
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10
arch/arm/boot/dts/ste-dbx5x0-pinctrl.dtsi
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@ -130,7 +130,7 @@ default_mux {
};
default_cfg1 {
pins = "GPIO147_C15", "GPIO148_B16"; /* SDA/SCL */
ste,config = <&in_pu>;
ste,config = <&in_nopull>;
};
};
@ -150,7 +150,7 @@ default_mux {
};
default_cfg1 {
pins = "GPIO16_AD3", "GPIO17_AD4"; /* SDA/SCL */
ste,config = <&in_pu>;
ste,config = <&in_nopull>;
};
};
@ -170,7 +170,7 @@ default_mux {
};
default_cfg1 {
pins = "GPIO10_AF5", "GPIO11_AG4"; /* SDA/SCL */
ste,config = <&in_pu>;
ste,config = <&in_nopull>;
};
};
@ -190,7 +190,7 @@ default_mux {
};
default_cfg1 {
pins = "GPIO229_AG7", "GPIO230_AF7"; /* SDA/SCL */
ste,config = <&in_pu>;
ste,config = <&in_nopull>;
};
};
@ -214,7 +214,7 @@ default_mux {
};
default_cfg1 {
pins = "GPIO4_AH6", "GPIO5_AG6"; /* SDA/SCL */
ste,config = <&in_pu>;
ste,config = <&in_nopull>;
};
};