kernel_samsung_sm7125

jenna

History

Albrecht Dreß 0c2daaafcd powerpc/5200/i2c: improve i2c bus error recovery This patch improves the recovery of the MPC's I2C bus from errors like bus hangs resulting in timeouts: 1. make the bus timeout configurable, as it depends on the bus clock and the attached slave chip(s); default is still 1 second; 2. detect any of the cases indicated by the CF, BB and RXAK MSR flags if a timeout occurs, and add a missing (required) MAL reset; 3. use a more reliable method to fixup the bus if a hang has been detected. The sequence is sent 9 times which seems to be necessary if a slave "misses" more than one clock cycle. For 400 kHz bus speed, the fixup is also ~70us (81us vs. 150us) faster. Tested on a custom Lite5200b derived board, with a Dallas RTC, AD sensors and NXP IO expander chips attached to the i2c. Changes vs. v1: - use improved bus fixup sequence for all chips (not only the 5200) - calculate real clock from defaults if no clock is given in the device tree - better description (I hope) of the changes. I didn't split the changes in this file into three parts as recommended by Grant, as they actually belong together (i.e. they address one single problem, just in three places of one single source file). Signed-off-by: Albrecht Dreß <albrecht.dress@arcor.de> [grant.likely@secretlab.ca: fixup for ->node to ->dev.of_node transition] Signed-off-by: Grant Likely <grant.likely@secretlab.ca>		15 years ago
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4xx	powerpc/4xx: Add optional "reset_type" property to control reboot via dts	15 years ago
can	…
fsl	powerpc/5200/i2c: improve i2c bus error recovery	15 years ago
gpio	…
nintendo	powerpc: wii: device tree	15 years ago
ecm.txt	…
marvell.txt	trivial: fix typo "for for" in multiple files	16 years ago
mmc-spi-slot.txt	…
mtd-physmap.txt	mtd: maps: add mtd-ram support to physmap_of	16 years ago
phy.txt	…
spi-bus.txt	…
usb-ehci.txt	…
xilinx.txt	Fix comment and Kconfig typos for 'require' and 'fragment'	15 years ago