ARM: dts: ux500: Disable I2C/SPI buses by default

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>
Link: https://lore.kernel.org/r/20191125170428.76069-1-stephan@gerhold.net
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/arch/arm/boot/dts/ste-dbx5x0.dtsi b/arch/arm/boot/dts/ste-dbx5x0.dtsi
index bda454d..d0770c0 100644 (file)
--- a/arch/arm/boot/dts/ste-dbx5x0.dtsi
+++ b/arch/arm/boot/dts/ste-dbx5x0.dtsi
@@ -651,6 +651,8 @@
                        clocks = <&prcc_kclk 3 3>, <&prcc_pclk 3 3>;
                        clock-names = "i2cclk", "apb_pclk";
                        power-domains = <&pm_domains DOMAIN_VAPE>;
+
+                       status = "disabled";
                };
 
                i2c@80122000 {
@@ -667,6 +669,8 @@
                        clocks = <&prcc_kclk 1 2>, <&prcc_pclk 1 2>;
                        clock-names = "i2cclk", "apb_pclk";
                        power-domains = <&pm_domains DOMAIN_VAPE>;
+
+                       status = "disabled";
                };
 
                i2c@80128000 {
@@ -683,6 +687,8 @@
                        clocks = <&prcc_kclk 1 6>, <&prcc_pclk 1 6>;
                        clock-names = "i2cclk", "apb_pclk";
                        power-domains = <&pm_domains DOMAIN_VAPE>;
+
+                       status = "disabled";
                };
 
                i2c@80110000 {
@@ -699,6 +705,8 @@
                        clocks = <&prcc_kclk 2 0>, <&prcc_pclk 2 0>;
                        clock-names = "i2cclk", "apb_pclk";
                        power-domains = <&pm_domains DOMAIN_VAPE>;
+
+                       status = "disabled";
                };
 
                i2c@8012a000 {
@@ -715,6 +723,8 @@
                        clocks = <&prcc_kclk 1 9>, <&prcc_pclk 1 10>;
                        clock-names = "i2cclk", "apb_pclk";
                        power-domains = <&pm_domains DOMAIN_VAPE>;
+
+                       status = "disabled";
                };
 
                spi@80002000 {
@@ -729,6 +739,8 @@
                               <&dma 8 0 0x0>; /* Logical - MemToDev */
                        dma-names = "rx", "tx";
                        power-domains = <&pm_domains DOMAIN_VAPE>;
+
+                       status = "disabled";
                };
 
                spi@80003000 {
@@ -743,6 +755,8 @@
                               <&dma 9 0 0x0>; /* Logical - MemToDev */
                        dma-names = "rx", "tx";
                        power-domains = <&pm_domains DOMAIN_VAPE>;
+
+                       status = "disabled";
                };
 
                spi@8011a000 {
@@ -758,6 +772,8 @@
                               <&dma 0 0 0x0>; /* Logical - MemToDev */
                        dma-names = "rx", "tx";
                        power-domains = <&pm_domains DOMAIN_VAPE>;
+
+                       status = "disabled";
                };
 
                spi@80112000 {
@@ -773,6 +789,8 @@
                               <&dma 35 0 0x0>; /* Logical - MemToDev */
                        dma-names = "rx", "tx";
                        power-domains = <&pm_domains DOMAIN_VAPE>;
+
+                       status = "disabled";
                };
 
                spi@80111000 {
@@ -788,6 +806,8 @@
                               <&dma 33 0 0x0>; /* Logical - MemToDev */
                        dma-names = "rx", "tx";
                        power-domains = <&pm_domains DOMAIN_VAPE>;
+
+                       status = "disabled";
                };
 
                spi@80129000 {
@@ -803,6 +823,8 @@
                               <&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 7613a40..5eafd5d 100644 (file)
--- 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 a036def..937f942 100644 (file)
--- 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 8b80dcd..ce13641 100644 (file)
--- 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 {