target/linux/bcm27xx/patches-6.1/950-1263-ARM-dts-rp1-Boost-the-I2C-drive-strength.patch

   1 From ea9b088747d379256e2582dd5c29638bf4ff9928 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Wed, 31 Jan 2024 17:20:07 +0000
   4 Subject: [PATCH 1263/1295] ARM: dts: rp1: Boost the I2C drive strength
   5
   6 Boosting the drive strength on I2C pins allows SCL to achieve safe
   7 voltage swings, even at 1MHz.
   8
   9 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  10 ---
  11  arch/arm/boot/dts/rp1.dtsi | 13 +++++++++++++
  12  1 file changed, 13 insertions(+)
  13
  14 --- a/arch/arm/boot/dts/rp1.dtsi
  15 +++ b/arch/arm/boot/dts/rp1.dtsi
  16 @@ -650,66 +650,79 @@
  17                         rp1_i2c4_34_35: rp1_i2c4_34_35 {
  18                                 function = "i2c4";
  19                                 pins = "gpio34", "gpio35";
  20 +                               drive-strength = <12>;
  21                                 bias-pull-up;
  22                         };
  23                         rp1_i2c6_38_39: rp1_i2c6_38_39 {
  24                                 function = "i2c6";
  25                                 pins = "gpio38", "gpio39";
  26 +                               drive-strength = <12>;
  27                                 bias-pull-up;
  28                         };
  29                         rp1_i2c4_40_41: rp1_i2c4_40_41 {
  30                                 function = "i2c4";
  31                                 pins = "gpio40", "gpio41";
  32 +                               drive-strength = <12>;
  33                                 bias-pull-up;
  34                         };
  35                         rp1_i2c5_44_45: rp1_i2c5_44_45 {
  36                                 function = "i2c5";
  37                                 pins = "gpio44", "gpio45";
  38 +                               drive-strength = <12>;
  39                                 bias-pull-up;
  40                         };
  41                         rp1_i2c0_0_1: rp1_i2c0_0_1 {
  42                                 function = "i2c0";
  43                                 pins = "gpio0", "gpio1";
  44 +                               drive-strength = <12>;
  45                                 bias-pull-up;
  46                         };
  47                         rp1_i2c0_8_9: rp1_i2c0_8_9 {
  48                                 function = "i2c0";
  49                                 pins = "gpio8", "gpio9";
  50 +                               drive-strength = <12>;
  51                                 bias-pull-up;
  52                         };
  53                         rp1_i2c1_2_3: rp1_i2c1_2_3 {
  54                                 function = "i2c1";
  55                                 pins = "gpio2", "gpio3";
  56 +                               drive-strength = <12>;
  57                                 bias-pull-up;
  58                         };
  59                         rp1_i2c1_10_11: rp1_i2c1_10_11 {
  60                                 function = "i2c1";
  61                                 pins = "gpio10", "gpio11";
  62 +                               drive-strength = <12>;
  63                                 bias-pull-up;
  64                         };
  65                         rp1_i2c2_4_5: rp1_i2c2_4_5 {
  66                                 function = "i2c2";
  67                                 pins = "gpio4", "gpio5";
  68 +                               drive-strength = <12>;
  69                                 bias-pull-up;
  70                         };
  71                         rp1_i2c2_12_13: rp1_i2c2_12_13 {
  72                                 function = "i2c2";
  73                                 pins = "gpio12", "gpio13";
  74 +                               drive-strength = <12>;
  75                                 bias-pull-up;
  76                         };
  77                         rp1_i2c3_6_7: rp1_i2c3_6_7 {
  78                                 function = "i2c3";
  79                                 pins = "gpio6", "gpio7";
  80 +                               drive-strength = <12>;
  81                                 bias-pull-up;
  82                         };
  83                         rp1_i2c3_14_15: rp1_i2c3_14_15 {
  84                                 function = "i2c3";
  85                                 pins = "gpio14", "gpio15";
  86 +                               drive-strength = <12>;
  87                                 bias-pull-up;
  88                         };
  89                         rp1_i2c3_22_23: rp1_i2c3_22_23 {
  90                                 function = "i2c3";
  91                                 pins = "gpio22", "gpio23";
  92 +                               drive-strength = <12>;
  93                                 bias-pull-up;
  94                         };
  95