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| Both sides previous revision Previous revision Next revision | Previous revision Last revision Both sides next revision | ||
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en:xu3_hardware_i2c [2017/06/19 17:31] neal [How to change the I2C clock speed] |
en:xu3_hardware_i2c [2017/07/07 11:28] john1117 [How to change the I2C clock speed] |
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| Line 101: | Line 101: | ||
| Make a backup of DTB file. | Make a backup of DTB file. | ||
| + | * kernel 4.9.y | ||
| <code> | <code> | ||
| cp /media/boot/exynos5422-odroidxu4.dtb /media/boot/exynos5422-odroidxu4.dtb.org | cp /media/boot/exynos5422-odroidxu4.dtb /media/boot/exynos5422-odroidxu4.dtb.org | ||
| + | </code> | ||
| + | * kernel 3.10.y | ||
| + | <code> | ||
| + | cp /media/boot/exynos5422-odroidxu3.dtb /media/boot/exynos5422-odroidxu3.dtb.org | ||
| </code> | </code> | ||
| Using dtc command, you can make "dts" type of device tree from "dtb" type. | Using dtc command, you can make "dts" type of device tree from "dtb" type. | ||
| + | * kernel 4.9.y | ||
| <code> | <code> | ||
| dtc -I dtb -O dts -o exynos5422-odroidxu4.dts exynos5422-odroidxu4.dtb | dtc -I dtb -O dts -o exynos5422-odroidxu4.dts exynos5422-odroidxu4.dtb | ||
| + | </code> | ||
| + | * kernel 3.10.y | ||
| + | <code> | ||
| + | dtc -I dtb -O dts -o exynos5422-odroidxu3.dts exynos5422-odroidxu3.dtb | ||
| </code> | </code> | ||
| Line 126: | Line 136: | ||
| Check current maximum bus frequency of i2c@12C70000 | Check current maximum bus frequency of i2c@12C70000 | ||
| + | * kernel 4.9.y | ||
| <code> | <code> | ||
| fdtget /media/boot/exynos5422-odroidxu4.dtb /soc/i2c@12C70000 samsung,i2c-max-bus-freq | fdtget /media/boot/exynos5422-odroidxu4.dtb /soc/i2c@12C70000 samsung,i2c-max-bus-freq | ||
| + | </code> | ||
| + | * kernel 3.10.y | ||
| + | <code> | ||
| + | fdtget /media/boot/exynos5422-odroidxu3.dtb /i2c@12C70000 samsung,i2c-max-bus-freq | ||
| </code> | </code> | ||
| Change the DTB file for i2c-1 (i2c channel #1) | Change the DTB file for i2c-1 (i2c channel #1) | ||
| + | * kernel 4.9.y | ||
| <code> | <code> | ||
| fdtput -t i /media/boot/exynos5422-odroidxu4.dtb /soc/i2c@12c70000 samsung,i2c-max-bus-freq "10000" | fdtput -t i /media/boot/exynos5422-odroidxu4.dtb /soc/i2c@12c70000 samsung,i2c-max-bus-freq "10000" | ||
| + | sync | ||
| + | reboot | ||
| + | </code> | ||
| + | * kernel 3.10.y | ||
| + | <code> | ||
| + | fdtput -t i /media/boot/exynos5422-odroidxu3.dtb /i2c@12C70000 samsung,i2c-max-bus-freq "10000" | ||
| sync | sync | ||
| reboot | reboot | ||
