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1330e29105
linux/drivers/i2c/busses
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addy ke 1330e29105 i2c: rk3x: fix bug that cause measured high_ns doesn't meet I2C specification 
The number of clock cycles to be written into the CLKDIV register
that determines the I2C clk high phase includes the rise time.
So to meet the timing requirements defined in the I2C specification
which defines the minimal time SCL has to be high, the rise time
has to taken into account. The same applies to the low phase with
falling time.

In my test on RK3288-Pink2 board, which is not an upstream board yet,
if external pull-up resistor is 4.7K, rise_ns is about 700ns.
So the measured high_ns is about 3900ns, which is less than 4000ns
(the minimum high_ns in I2C specification for Standard-mode).

To fix this bug min_low_ns should include fall time and min_high_ns
should include rise time.

This patch merged the patch from chromium project which can get the
rise and fall times for signals from the device tree. This allows us
to more accurately calculate timings. see:
https://chromium-review.googlesource.com/#/c/232774/

Signed-off-by: Addy Ke <addy.ke@rock-chips.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Tested-by: Doug Anderson <dianders@chromium.org>
[wsa: fixed a typo in the docs]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2015-01-13 16:21:04 +01:00
..
i2c-acorn.c i2c: acorn: is tristate and should use module.h 2014-01-24 18:21:11 +01:00
i2c-ali15x3.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-ali1535.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-ali1563.c i2c: ali1563: fix checkpatch.pl issues 2014-05-22 10:09:21 +02:00
i2c-amd756-s4882.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-amd756.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-amd8111.c i2c: remove DEFINE_PCI_DEVICE_TABLE macro 2014-03-13 09:44:59 +01:00
i2c-at91.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-au1550.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-axxia.c i2c: axxia: Add I2C driver for AXM55xx 2014-10-03 14:11:53 +02:00
i2c-bcm2835.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-bcm-kona.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-bfin-twi.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-cadence.c i2c: cadence: Handle > 252 byte transfers 2015-01-13 16:21:03 +01:00
i2c-cbus-gpio.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-cpm.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-cros-ec-tunnel.c Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2014-10-19 12:50:44 -07:00
i2c-davinci.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-designware-core.c i2c: designware: prevent early stop on TX FIFO empty 2014-11-21 08:06:32 +01:00
i2c-designware-core.h i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-designware-pcidrv.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-designware-platdrv.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-diolan-u2c.c i2c: remove unnecessary OOM messages 2014-06-02 19:24:33 +02:00
i2c-dln2.c i2c: dln2: Simplify return flow for dln2_i2c_enable 2014-11-19 17:12:37 +00:00
i2c-efm32.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-eg20t.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-elektor.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-exynos5.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-gpio.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-highlander.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-hix5hd2.c PM: Merge the SET*_RUNTIME_PM_OPS() macros 2014-12-04 00:51:30 +01:00
i2c-hydra.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-i801.c i2c: i801: Add DeviceIDs for SunrisePoint LP 2014-11-12 17:19:13 +01:00
i2c-ibm_iic.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-ibm_iic.h
i2c-img-scb.c i2c: img-scb: Add Imagination Technologies I2C SCB driver 2014-11-17 19:54:24 +01:00
i2c-imx.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-iop3xx.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-iop3xx.h i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-isch.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-ismt.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-kempld.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-meson.c i2c: add support for Amlogic Meson I2C controller 2014-11-18 16:16:44 +01:00
i2c-mpc.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-mv64xxx.c i2c: mv64xxx: rework offload support to fix several problems 2014-12-17 19:26:03 +01:00
i2c-mxs.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-nforce2-s4985.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-nforce2.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-nomadik.c PM: Merge the SET*_RUNTIME_PM_OPS() macros 2014-12-04 00:51:30 +01:00
i2c-ocores.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-octeon.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-omap.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-opal.c i2c: Driver to expose PowerNV platform i2c busses 2014-12-14 12:44:46 +11:00
i2c-parport-light.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-parport.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-parport.h i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-pasemi.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-pca-isa.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-pca-platform.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-piix4.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-pmcmsp.c i2c: pmcmsp: remove dead code 2015-01-13 10:37:43 +01:00
i2c-pnx.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-powermac.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-puv3.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-pxa-pci.c i2c: remove DEFINE_PCI_DEVICE_TABLE macro 2014-03-13 09:44:59 +01:00
i2c-pxa.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-qup.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-rcar.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-riic.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-rk3x.c i2c: rk3x: fix bug that cause measured high_ns doesn't meet I2C specification 2015-01-13 16:21:04 +01:00
i2c-robotfuzz-osif.c i2c: Add bus driver for for OSIF USB i2c device. 2014-01-13 13:56:56 +01:00
i2c-s3c2410.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-scmi.c i2c: delete non-required instances of include <linux/init.h> 2014-01-24 18:24:31 +01:00
i2c-sh7760.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-sh_mobile.c i2c: sh_mobile: fix uninitialized var when debug is enabled 2014-12-20 09:28:09 +01:00
i2c-sibyte.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-simtec.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-sirf.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-sis96x.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-sis630.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-sis5595.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-st.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-stu300.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-sun6i-p2wi.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-taos-evm.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-tegra.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-tiny-usb.c i2c: i2c-tiny-usb: Remove RobotFuzz USB vendor:product ID 2014-01-13 13:56:52 +01:00
i2c-versatile.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-via.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-viapro.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-viperboard.c i2c: viperboard: remove superfluous assignment 2014-01-09 22:18:33 +01:00
i2c-wmt.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-xiic.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-xlr.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
Kconfig Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2014-12-20 13:52:52 -08:00
Makefile powerpc updates for 3.19 batch 2 2014-12-19 12:57:45 -08:00
scx200_acb.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00