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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>
This commit is contained in:
Stephan Gerhold 2019-11-25 18:04:25 +01:00 committed by Linus Walleij
parent 96b619e3c1
commit fae284f1bc
4 changed files with 32 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
arch/arm/boot/dts/ste-dbx5x0.dtsi
View File

@ -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 {

4
arch/arm/boot/dts/ste-href.dtsi
View File

@ -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 */

1
arch/arm/boot/dts/ste-hrefprev60.dtsi
View File

@ -58,6 +58,7 @@
*/
pinctrl-names = "default";
pinctrl-0 = <&ssp0_hrefprev60_mode>;
status = "okay";
};
// External Micro SD slot

5
arch/arm/boot/dts/ste-snowball.dts
View File

@ -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 {