commit 7e26335b1a3fb2400fcf6d5eb35328257ea2e139
author Jerome Brunet <jbrunet@baylibre.com> Fri Nov 09 15:04:45 2018 +0100
committer Kevin Hilman <khilman@baylibre.com> Wed Nov 28 16:41:11 2018 -0800
tree 1cda79f89edb32f06334e25a0e7b0f0ea0aa7cf6
parent 340cda67ed80d976c6bec143979cb34bef4c9c85

ARM: dts: meson: consistently disable pin bias

On Amlogic chipsets, the bias set through pinconf applies to the pad
itself, not only the GPIO function. This means that even when we change
the function of the pad from GPIO to anything else, the bias previously
set still applies.

As we have seen with the eMMC, depending on the bias type and the function,
it may trigger problems.

The underlying issue is that we inherit whatever was left by previous user
of the pad (pinconf, u-boot or the ROM code). As a consequence, the actual
setup we will get is undefined.

There is nothing mentioned in the documentation about pad bias and pinmux
function, however leaving it undefined is not an option.

This change consistently disable the pad bias for every pinmux functions.
It seems to work well, we can only assume that the necessary bias (if any)
is already provided by the pin function itself.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Acked-by: Martin Blumenstingl<martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm/boot/dts/meson8b.dtsi

diff --git a/arch/arm/boot/dts/meson8b.dtsi b/arch/arm/boot/dts/meson8b.dtsi
index cd1ca9d..46b3564 100644
--- a/arch/arm/boot/dts/meson8b.dtsi
+++ b/arch/arm/boot/dts/meson8b.dtsi
@@ -146,6 +146,7 @@
 			mux {
 				groups = "uart_tx_ao_a", "uart_rx_ao_a";
 				function = "uart_ao";
+				bias-disable;
 			};
 		};
 
@@ -153,6 +154,7 @@
 			mux {
 				groups = "remote_input";
 				function = "remote";
+				bias-disable;
 			};
 		};
 	};
@@ -220,6 +222,7 @@
 					 "eth_txd2",
 					 "eth_txd3";
 				function = "ethernet";
+				bias-disable;
 			};
 		};
 
@@ -235,6 +238,7 @@
 					 "eth_mdio_en",
 					 "eth_mdc";
 				function = "ethernet";
+				bias-disable;
 			};
 		};
 
@@ -242,6 +246,7 @@
 			mux {
 				groups = "i2c_sda_a", "i2c_sck_a";
 				function = "i2c_a";
+				bias-disable;
 			};
 		};
 
@@ -250,6 +255,7 @@
 				groups = "sd_d0_b", "sd_d1_b", "sd_d2_b",
 					"sd_d3_b", "sd_clk_b", "sd_cmd_b";
 				function = "sd_b";
+				bias-disable;
 			};
 		};
 
@@ -257,6 +263,7 @@
 			mux {
 				groups = "pwm_c1";
 				function = "pwm_c";
+				bias-disable;
 			};
 		};
 
@@ -265,6 +272,7 @@
 				groups = "uart_tx_b0",
 				       "uart_rx_b0";
 				function = "uart_b";
+				bias-disable;
 			};
 		};
 
@@ -273,6 +281,7 @@
 				groups = "uart_cts_b0",
 				       "uart_rts_b0";
 				function = "uart_b";
+				bias-disable;
 			};
 		};
 	};