diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0764-overlays-i2c-gpio-Avoid-open-drain-warnings.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0764-overlays-i2c-gpio-Avoid-open-drain-warnings.patch | 93 |
1 files changed, 0 insertions, 93 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0764-overlays-i2c-gpio-Avoid-open-drain-warnings.patch b/target/linux/bcm27xx/patches-5.4/950-0764-overlays-i2c-gpio-Avoid-open-drain-warnings.patch deleted file mode 100644 index 9b6cb1d564..0000000000 --- a/target/linux/bcm27xx/patches-5.4/950-0764-overlays-i2c-gpio-Avoid-open-drain-warnings.patch +++ /dev/null @@ -1,93 +0,0 @@ -From 11f89a12530471a2b25c71416e106eaa014818c0 Mon Sep 17 00:00:00 2001 -From: Phil Elwell <phil@raspberrypi.com> -Date: Fri, 5 Jun 2020 16:07:07 +0100 -Subject: [PATCH] overlays: i2c-gpio: Avoid open-drain warnings - -The i2c-gpio driver expects to use a GPIO in open-drain mode. Failure -to configure it in that way causes alarming warnings in the kernel log. -The BCM283x and BCM2711 GPIO blocks don't support open-drain mode, but -gpiolib can emulate it in software if configured correctly. - -Silence the warning by declaring the GPIOs as requiring open-drain -mode, trusting gpiolib to manage the emulation. The previous -incarnation of this patch took the other approach of telling the -i2c-gpio driver that the GPIOs were configured for open-drain, but -this had the effect of disabling the emulation. In some cases this -appears to work, but examining the waveforms as analogue voltages -shows contention, the success or failure depending on drive strengths. - -See: https://github.com/raspberrypi/firmware/issues/1381 -See: https://github.com/raspberrypi/firmware/issues/1401 - -Signed-off-by: Phil Elwell <phil@raspberrypi.com> ---- - arch/arm/boot/dts/overlays/balena-fin-overlay.dts | 5 ++++- - arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts | 6 ++++-- - arch/arm/boot/dts/overlays/i2c-rtc-gpio-overlay.dts | 6 ++++-- - 3 files changed, 12 insertions(+), 5 deletions(-) - ---- a/arch/arm/boot/dts/overlays/balena-fin-overlay.dts -+++ b/arch/arm/boot/dts/overlays/balena-fin-overlay.dts -@@ -1,6 +1,8 @@ - /dts-v1/; - /plugin/; - -+#include <dt-bindings/gpio/gpio.h> -+ - /{ - compatible = "brcm,bcm2835"; - -@@ -48,7 +50,8 @@ - - i2c_soft: i2c@0 { - compatible = "i2c-gpio"; -- gpios = <&gpio 43 0 /* sda */ &gpio 42 0 /* scl */>; -+ gpios = <&gpio 43 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN) /* sda */ -+ &gpio 42 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN) /* scl */>; - i2c-gpio,delay-us = <5>; - i2c-gpio,scl-open-drain; - i2c-gpio,sda-open-drain; ---- a/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts -+++ b/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts -@@ -2,6 +2,8 @@ - /dts-v1/; - /plugin/; - -+#include <dt-bindings/gpio/gpio.h> -+ - / { - compatible = "brcm,bcm2835"; - -@@ -12,8 +14,8 @@ - i2c_gpio: i2c@0 { - reg = <0xffffffff>; - compatible = "i2c-gpio"; -- gpios = <&gpio 23 0 /* sda */ -- &gpio 24 0 /* scl */ -+ gpios = <&gpio 23 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN) /* sda */ -+ &gpio 24 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN) /* scl */ - >; - i2c-gpio,delay-us = <2>; /* ~100 kHz */ - #address-cells = <1>; ---- a/arch/arm/boot/dts/overlays/i2c-rtc-gpio-overlay.dts -+++ b/arch/arm/boot/dts/overlays/i2c-rtc-gpio-overlay.dts -@@ -3,6 +3,8 @@ - /dts-v1/; - /plugin/; - -+#include <dt-bindings/gpio/gpio.h> -+ - / { - compatible = "brcm,bcm2835"; - -@@ -11,8 +13,8 @@ - __overlay__ { - i2c_gpio: i2c-gpio-rtc@0 { - compatible = "i2c-gpio"; -- gpios = <&gpio 23 0 /* sda */ -- &gpio 24 0 /* scl */ -+ gpios = <&gpio 23 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN) /* sda */ -+ &gpio 24 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN) /* scl */ - >; - i2c-gpio,delay-us = <2>; /* ~100 kHz */ - #address-cells = <1>; |