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0285f8f5fd
linux/drivers/i2c/busses
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addy ke 0285f8f5fd i2c: rk3x: adjust the LOW divison based on characteristics of SCL 
As show in I2C specification:
- Standard-mode: the minimum HIGH period of the scl clock is 4.0us
                 the minimum LOW period of the scl clock is 4.7us
- Fast-mode: the minimum HIGH period of the scl clock is 0.6us
             the minimum LOW period of the scl clock is 1.3us

I have measured i2c SCL waveforms in fast-mode by oscilloscope
on rk3288-pinky board. the LOW period of the scl clock is 1.3us.
It is so critical that we must adjust LOW division to increase
the LOW period of the scl clock.

Thanks Doug for the suggestion about division formulas.

Signed-off-by: Addy Ke <addy.ke@rock-chips.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Max Schwarz <max.schwarz@online.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-11-10 15:56:26 +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 i2c: at91: add support for system PM 2014-11-10 09:35:00 +01:00
i2c-au1550.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-axxia.c i2c: axxia: Add I2C driver for AXM55xx 2014-10-03 14:11:53 +02:00
i2c-bcm2835.c i2c: i2c-bcm2835: Drop class based scanning to improve bootup time 2014-07-16 22:59:57 +02:00
i2c-bcm-kona.c i2c: i2c-bcm-kona: Fix module build 2013-11-26 14:00:57 +01:00
i2c-bfin-twi.c i2c: i2c-bfin-twi: Drop class based scanning to improve bootup time 2014-07-16 22:59:58 +02:00
i2c-cadence.c i2c: Add driver for Cadence I2C controller 2014-04-06 17:47:19 +02:00
i2c-cbus-gpio.c i2c: delete non-required instances of include <linux/init.h> 2014-01-24 18:24:31 +01:00
i2c-cpm.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
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 i2c: davinci: don't use interruptible completion 2014-11-10 09:35:01 +01:00
i2c-designware-core.c i2c: remove FSF address 2014-11-07 18:35:33 +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 i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-diolan-u2c.c i2c: remove unnecessary OOM messages 2014-06-02 19:24:33 +02:00
i2c-efm32.c i2c: efm32: correct namespacing of location property 2014-07-17 15:38:49 +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 i2c: exynos5: use proper errno for timeout 2014-11-10 09:34:59 +01:00
i2c-gpio.c i2c: gpio: Drop dead code in i2c_gpio_remove 2014-08-01 20:01:41 +02:00
i2c-highlander.c i2c: delete non-required instances of include <linux/init.h> 2014-01-24 18:24:31 +01:00
i2c-hix5hd2.c i2c: hix5hd2: add i2c controller driver 2014-10-16 09:14:17 +02:00
i2c-hydra.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-i801.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-ibm_iic.c i2c: delete non-required instances of include <linux/init.h> 2014-01-24 18:24:31 +01:00
i2c-ibm_iic.h
i2c-imx.c i2c: imx+mxs: Use the preferred form for passing a size of a struct 2014-11-10 09:34:54 +01:00
i2c-iop3xx.c i2c: delete non-required instances of include <linux/init.h> 2014-01-24 18:24:31 +01:00
i2c-iop3xx.h i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-isch.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-ismt.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-kempld.c i2c: Fix Kontron PLD prescaler calculation 2013-08-05 10:31:18 +02:00
i2c-mpc.c i2c: mpc: delete unneeded test before of_node_put 2014-08-08 18:45:30 +02:00
i2c-mv64xxx.c i2c: mv64xxx: continue probe when clock-frequency is missing 2014-09-02 12:34:08 +02:00
i2c-mxs.c i2c: imx+mxs: Use the preferred form for passing a size of a struct 2014-11-10 09:34:54 +01:00
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 i2c: i2c-nomadik: Drop class based scanning to improve bootup time 2014-07-16 23:00:01 +02:00
i2c-ocores.c i2c: i2c-ocores: Drop class based scanning to improve bootup time 2014-07-16 23:00:02 +02:00
i2c-octeon.c i2c: delete non-required instances of include <linux/init.h> 2014-01-24 18:24:31 +01:00
i2c-omap.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-parport-light.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
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: delete non-required instances of include <linux/init.h> 2014-01-24 18:24:31 +01:00
i2c-piix4.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-pmcmsp.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-pnx.c i2c: pnx: Use devm_*() functions 2014-01-16 11:15:50 +01:00
i2c-powermac.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-puv3.c i2c: delete non-required instances of include <linux/init.h> 2014-01-24 18:24:31 +01:00
i2c-pxa-pci.c i2c: remove DEFINE_PCI_DEVICE_TABLE macro 2014-03-13 09:44:59 +01:00
i2c-pxa.c i2c: Make of_device_id array const 2014-06-02 19:29:37 +02:00
i2c-qup.c i2c: qup: Fix order of runtime pm initialization 2014-10-03 03:20:47 +02:00
i2c-rcar.c i2c: rcar: remove sign-compare flaw 2014-09-29 22:43:25 +02:00
i2c-riic.c i2c: Make of_device_id array const 2014-06-02 19:29:37 +02:00
i2c-rk3x.c i2c: rk3x: adjust the LOW divison based on characteristics of SCL 2014-11-10 15:56:26 +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 i2c: remove FSF address 2014-11-07 18:35:33 +01:00
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: delete non-required instances of include <linux/init.h> 2014-01-24 18:24:31 +01:00
i2c-sh_mobile.c i2c: sh_mobile: Add support for r8a73a4 and sh73a0 2014-11-10 09:34:56 +01:00
i2c-sibyte.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-simtec.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-sirf.c i2c: i2c-sirf: Drop class based scanning to improve bootup time 2014-07-16 23:00:06 +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: st: Update i2c timings 2014-08-01 19:47:17 +02:00
i2c-stu300.c i2c: i2c-stu300: Drop class based scanning to improve bootup time 2014-07-16 23:00:06 +02:00
i2c-sun6i-p2wi.c i2c: sun6i-p2wi: Remove duplicate inclusion of module.h 2014-06-27 14:39:36 +02:00
i2c-taos-evm.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-tegra.c i2c: tegra: Move clk_prepare/clk_set_rate to probe 2014-09-20 11:15:23 +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: move OF helpers into the core 2013-08-23 10:22:20 +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: Make of_device_id array const 2014-06-02 19:29:37 +02:00
i2c-xiic.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-xlr.c i2c: delete non-required instances of include <linux/init.h> 2014-01-24 18:24:31 +01:00
Kconfig 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
Makefile i2c: hix5hd2: add i2c controller driver 2014-10-16 09:14:17 +02:00
scx200_acb.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00