[PATCH 1/4] ARM: dts: ux500: Disable I2C/SPI buses by default

* [PATCH 1/4] ARM: dts: ux500: Disable I2C/SPI buses by default
@ 2019-11-25 17:04 Stephan Gerhold
  2019-11-25 17:04 ` [PATCH 2/4] ARM: dts: ux500: Add aliases for I2C and SPI buses Stephan Gerhold
                   ` (3 more replies)
  0 siblings, 4 replies; 5+ messages in thread
From: Stephan Gerhold @ 2019-11-25 17:04 UTC (permalink / raw)
  To: Linus Walleij
  Cc: Rob Herring, Mark Rutland, linux-arm-kernel, devicetree,
	linux-kernel, Stephan Gerhold

At the moment, all 5 I2C and 6 SPI buses are probed and exposed
to user-space by default - even if they are not muxed to any pins
on the board. This means that user-space sees an I2C/SPI bus that
cannot be actually used properly.

In some cases this was used to put the corresponding pins into
a low power sleep mode - but even then the pins first need to be
configured by the board-specific device tree part.

Avoid exposing unconfigured devices to user-space by disabling
the I2C/SPI buses by default. Enable them in the board device trees
when needed.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
---
 arch/arm/boot/dts/ste-dbx5x0.dtsi     | 22 ++++++++++++++++++++++
 arch/arm/boot/dts/ste-href.dtsi       |  4 ++++
 arch/arm/boot/dts/ste-hrefprev60.dtsi |  1 +
 arch/arm/boot/dts/ste-snowball.dts    |  5 +++++
 4 files changed, 32 insertions(+)

diff --git a/arch/arm/boot/dts/ste-dbx5x0.dtsi b/arch/arm/boot/dts/ste-dbx5x0.dtsi
index a53657b83288..899368aa6ff7 100644
--- a/arch/arm/boot/dts/ste-dbx5x0.dtsi
+++ b/arch/arm/boot/dts/ste-dbx5x0.dtsi
@@ -646,6 +646,8 @@
 			clocks = <&prcc_kclk 3 3>, <&prcc_pclk 3 3>;
 			clock-names = "i2cclk", "apb_pclk";
 			power-domains = <&pm_domains DOMAIN_VAPE>;
+
+			status = "disabled";
 		};
 
 		i2c@80122000 {
@@ -662,6 +664,8 @@
 			clocks = <&prcc_kclk 1 2>, <&prcc_pclk 1 2>;
 			clock-names = "i2cclk", "apb_pclk";
 			power-domains = <&pm_domains DOMAIN_VAPE>;
+
+			status = "disabled";
 		};
 
 		i2c@80128000 {
@@ -678,6 +682,8 @@
 			clocks = <&prcc_kclk 1 6>, <&prcc_pclk 1 6>;
 			clock-names = "i2cclk", "apb_pclk";
 			power-domains = <&pm_domains DOMAIN_VAPE>;
+
+			status = "disabled";
 		};
 
 		i2c@80110000 {
@@ -694,6 +700,8 @@
 			clocks = <&prcc_kclk 2 0>, <&prcc_pclk 2 0>;
 			clock-names = "i2cclk", "apb_pclk";
 			power-domains = <&pm_domains DOMAIN_VAPE>;
+
+			status = "disabled";
 		};
 
 		i2c@8012a000 {
@@ -710,6 +718,8 @@
 			clocks = <&prcc_kclk 1 9>, <&prcc_pclk 1 10>;
 			clock-names = "i2cclk", "apb_pclk";
 			power-domains = <&pm_domains DOMAIN_VAPE>;
+
+			status = "disabled";
 		};
 
 		spi@80002000 {
@@ -724,6 +734,8 @@
 			       <&dma 8 0 0x0>; /* Logical - MemToDev */
 			dma-names = "rx", "tx";
 			power-domains = <&pm_domains DOMAIN_VAPE>;
+
+			status = "disabled";
 		};
 
 		spi@80003000 {
@@ -738,6 +750,8 @@
 			       <&dma 9 0 0x0>; /* Logical - MemToDev */
 			dma-names = "rx", "tx";
 			power-domains = <&pm_domains DOMAIN_VAPE>;
+
+			status = "disabled";
 		};
 
 		spi@8011a000 {
@@ -753,6 +767,8 @@
 			       <&dma 0 0 0x0>; /* Logical - MemToDev */
 			dma-names = "rx", "tx";
 			power-domains = <&pm_domains DOMAIN_VAPE>;
+
+			status = "disabled";
 		};
 
 		spi@80112000 {
@@ -768,6 +784,8 @@
 			       <&dma 35 0 0x0>; /* Logical - MemToDev */
 			dma-names = "rx", "tx";
 			power-domains = <&pm_domains DOMAIN_VAPE>;
+
+			status = "disabled";
 		};
 
 		spi@80111000 {
@@ -783,6 +801,8 @@
 			       <&dma 33 0 0x0>; /* Logical - MemToDev */
 			dma-names = "rx", "tx";
 			power-domains = <&pm_domains DOMAIN_VAPE>;
+
+			status = "disabled";
 		};
 
 		spi@80129000 {
@@ -798,6 +818,8 @@
 			       <&dma 40 0 0x0>; /* Logical - MemToDev */
 			dma-names = "rx", "tx";
 			power-domains = <&pm_domains DOMAIN_VAPE>;
+
+			status = "disabled";
 		};
 
 		ux500_serial0: uart@80120000 {
diff --git a/arch/arm/boot/dts/ste-href.dtsi b/arch/arm/boot/dts/ste-href.dtsi
index 7613a40421d5..5eafd5d8a8cd 100644
--- a/arch/arm/boot/dts/ste-href.dtsi
+++ b/arch/arm/boot/dts/ste-href.dtsi
@@ -39,18 +39,21 @@
 			pinctrl-names = "default","sleep";
 			pinctrl-0 = <&i2c0_a_1_default>;
 			pinctrl-1 = <&i2c0_a_1_sleep>;
+			status = "okay";
 		};
 
 		i2c@80122000 {
 			pinctrl-names = "default","sleep";
 			pinctrl-0 = <&i2c1_b_2_default>;
 			pinctrl-1 = <&i2c1_b_2_sleep>;
+			status = "okay";
 		};
 
 		i2c@80128000 {
 			pinctrl-names = "default","sleep";
 			pinctrl-0 = <&i2c2_b_2_default>;
 			pinctrl-1 = <&i2c2_b_2_sleep>;
+			status = "okay";
 			lp5521@33 {
 				compatible = "national,lp5521";
 				reg = <0x33>;
@@ -98,6 +101,7 @@
 			pinctrl-names = "default","sleep";
 			pinctrl-0 = <&i2c3_c_2_default>;
 			pinctrl-1 = <&i2c3_c_2_sleep>;
+			status = "okay";
 		};
 
 		/* ST6G3244ME level translator for 1.8/2.9 V */
diff --git a/arch/arm/boot/dts/ste-hrefprev60.dtsi b/arch/arm/boot/dts/ste-hrefprev60.dtsi
index a036defdf164..937f942f0961 100644
--- a/arch/arm/boot/dts/ste-hrefprev60.dtsi
+++ b/arch/arm/boot/dts/ste-hrefprev60.dtsi
@@ -58,6 +58,7 @@
 			 */
 			pinctrl-names = "default";
 			pinctrl-0 = <&ssp0_hrefprev60_mode>;
+			status = "okay";
 		};
 
 		// External Micro SD slot
diff --git a/arch/arm/boot/dts/ste-snowball.dts b/arch/arm/boot/dts/ste-snowball.dts
index 8b80dcdf6e5b..ce136412b6da 100644
--- a/arch/arm/boot/dts/ste-snowball.dts
+++ b/arch/arm/boot/dts/ste-snowball.dts
@@ -307,18 +307,21 @@
 			pinctrl-names = "default","sleep";
 			pinctrl-0 = <&i2c0_a_1_default>;
 			pinctrl-1 = <&i2c0_a_1_sleep>;
+			status = "okay";
 		};
 
 		i2c@80122000 {
 			pinctrl-names = "default","sleep";
 			pinctrl-0 = <&i2c1_b_2_default>;
 			pinctrl-1 = <&i2c1_b_2_sleep>;
+			status = "okay";
 		};
 
 		i2c@80128000 {
 			pinctrl-names = "default","sleep";
 			pinctrl-0 = <&i2c2_b_2_default>;
 			pinctrl-1 = <&i2c2_b_2_sleep>;
+			status = "okay";
 			lsm303dlh@18 {
 				/* Accelerometer */
 				compatible = "st,lsm303dlh-accel";
@@ -369,11 +372,13 @@
 			pinctrl-names = "default","sleep";
 			pinctrl-0 = <&i2c3_c_2_default>;
 			pinctrl-1 = <&i2c3_c_2_sleep>;
+			status = "okay";
 		};
 
 		spi@80002000 {
 			pinctrl-names = "default";
 			pinctrl-0 = <&ssp0_snowball_mode>;
+			status = "okay";
 		};
 
 		prcmu@80157000 {
-- 
2.24.0


^ permalink raw reply related	[flat|nested] 5+ messages in thread