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ee05fea21b
linux/drivers/i2c/busses
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Noralf Trønnes ee05fea21b i2c: bcm2835: Add support for Repeated Start Condition 
Documentation/i2c/i2c-protocol states that Combined transactions should
separate messages with a Start bit and end the whole transaction with a
Stop bit. This patch adds support for issuing only a Start between
messages instead of a Stop followed by a Start.

This implementation differs from downstream i2c-bcm2708 in 2 respects:
- it uses an interrupt to detect that the transfer is active instead
  of using polling. There is no interrupt for Transfer Active, but by
  not prefilling the FIFO it's possible to use the TXW interrupt.
- when resetting/disabling the controller between transfers it writes
  CLEAR to the control register instead of just zero.
  Using just zero gave many errors. This might be the reason why
  downstream had to disable this feature and make it available with a
  module parameter.

I have run thousands of transfers to a DS1307 (rtc), MMA8451 (accel)
and AT24C32 (eeprom) in parallel without problems.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2016-11-07 01:48:32 +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: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-amd8111.c i2c: remove DEFINE_PCI_DEVICE_TABLE macro 2014-03-13 09:44:59 +01:00
i2c-at91.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-au1550.c i2c: au1550: Convert to devm_kzalloc and devm_ioremap_resource 2015-10-23 23:31:11 +02:00
i2c-axxia.c i2c: axxia: disable clks in case of failure in probe 2016-09-24 11:26:55 +02:00
i2c-bcm2835.c i2c: bcm2835: Add support for Repeated Start Condition 2016-11-07 01:48:32 +01:00
i2c-bcm-iproc.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-bcm-kona.c Merge branch 'i2c/for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2016-10-07 14:12:21 -07:00
i2c-bfin-twi.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-brcmstb.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-cadence.c Merge branch 'i2c/for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2016-10-07 14:12:21 -07:00
i2c-cbus-gpio.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-cpm.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-cros-ec-tunnel.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-davinci.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-designware-baytrail.c i2c: designware-platform: Drop duplicate module information 2016-02-12 20:40:13 +01:00
i2c-designware-core.c i2c: designware: Avoid aborted transfers with fast reacting I2C slaves 2016-10-25 12:09:09 +02:00
i2c-designware-core.h i2c: designware: detect when dynamic tar update is possible 2016-08-26 00:42:15 +02:00
i2c-designware-pcidrv.c i2c: designware-pci: clarify a comment for Merrifield 2016-07-06 00:42:17 +09:00
i2c-designware-platdrv.c i2c: designware: Find bus speed from ACPI 2016-08-26 00:42:11 +02:00
i2c-digicolor.c i2c: digicolor: Fix module autoload 2016-10-25 11:49:01 +02:00
i2c-diolan-u2c.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-dln2.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-efm32.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-eg20t.c i2c-eg20t: fix race between i2c init and interrupt enable 2016-09-21 18:07:51 +02:00
i2c-elektor.c i2c: elektor: Utilize the module_isa_driver macro 2016-06-19 19:45:43 +02:00
i2c-emev2.c i2c: emev2: add slave support 2015-12-05 19:55:36 +01:00
i2c-exynos5.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
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 i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-hydra.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-i801.c i2c: i801: Fix I2C Block Read on 8-Series/C220 and later 2016-10-25 12:00:01 +02:00
i2c-ibm_iic.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-ibm_iic.h
i2c-img-scb.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-imx.c i2c: imx: defer probe if bus recovery GPIOs are not ready 2016-10-25 12:15:00 +02:00
i2c-iop3xx.c i2c: iop3xx: use new 8 bit address helper function 2016-04-11 18:54:59 +02:00
i2c-iop3xx.h i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-isch.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-ismt.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-jz4780.c i2c: jz4780: Fix module autoload 2016-10-25 11:48:58 +02:00
i2c-kempld.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-lpc2k.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-meson.c i2c: meson: add gxbb compatible string 2016-09-15 21:37:16 +02:00
i2c-mpc.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-mt65xx.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-mv64xxx.c i2c: mv64xxx: remove CONFIG_HAVE_CLK conditionals 2016-04-27 19:03:15 +02:00
i2c-mxs.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-nforce2-s4985.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-nforce2.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-nomadik.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-ocores.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-octeon-core.c i2c: octeon: thunderx: Limit register access retries 2016-09-24 11:22:24 +02:00
i2c-octeon-core.h i2c: octeon: thunderx: Limit register access retries 2016-09-24 11:22:24 +02:00
i2c-octeon-platdrv.c i2c: octeon: Sort include files alphabetically 2016-08-26 00:41:58 +02:00
i2c-omap.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-opal.c powerpc/opal: Add inline function to get rc from an ASYNC_COMP opal_msg 2016-06-29 17:33:18 +10:00
i2c-parport-light.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-parport.c i2c: parport: start using pr_fmt 2015-08-10 08:37:28 +02:00
i2c-parport.h i2c: parport: Add VCT-jig adapter 2015-08-10 08:37:34 +02:00
i2c-pasemi.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-pca-isa.c i2c: pca-isa: Utilize the module_isa_driver macro 2016-06-19 19:49:29 +02:00
i2c-pca-platform.c i2c: pca-platform: fix broken email address 2015-04-23 19:35:30 +02:00
i2c-piix4.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-pmcmsp.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-pnx.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-powermac.c i2c: powermac: use new 8 bit address helper function 2016-04-11 18:54:59 +02:00
i2c-puv3.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-pxa-pci.c i2c: remove DEFINE_PCI_DEVICE_TABLE macro 2014-03-13 09:44:59 +01:00
i2c-pxa.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-qup.c i2c: qup: skip qup_i2c_suspend if the device is already runtime suspended 2016-09-22 20:11:14 +02:00
i2c-rcar.c Merge branch 'i2c/for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2016-10-07 14:12:21 -07:00
i2c-riic.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-rk3x.c i2c: rk3x: Give the tuning value 0 during rk3x_i2c_v0_calc_timings 2016-10-25 11:11:46 +02:00
i2c-robotfuzz-osif.c i2c: robotfuzz-osif: Constify osif_table 2016-06-13 22:32:09 +02:00
i2c-s3c2410.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
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: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-sh_mobile.c Merge branch 'i2c/for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2016-10-07 14:12:21 -07:00
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: don't print error when adding adapter fails 2016-08-22 08:19:55 +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: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-stu300.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +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: taos-evm: replace simple_strtoul by kstrtou8 2015-11-30 18:37:22 +01:00
i2c-tegra.c i2c: tegra: Fix assignment of boolean variables 2016-09-08 22:36:18 +02:00
i2c-thunderx-pcidrv.c i2c: octeon,thunderx: Move register offsets to struct 2016-08-26 00:41:57 +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-uniphier-f.c i2c: uniphier-f: fix misdetection of incomplete STOP condition 2016-09-24 11:19:15 +02:00
i2c-uniphier.c i2c: uniphier: avoid WARN_ON() of clk_disable() in failure path 2016-09-08 22:40:32 +02:00
i2c-versatile.c i2c: versatile: Convert to use resource managed devm_* APIs 2016-07-14 21:21:56 +09:00
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: clean up inconsistent indenting 2015-08-10 08:37:38 +02:00
i2c-wmt.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-xgene-slimpro.c i2c: xgene: Avoid dma_buffer overrun 2016-10-25 11:50:52 +02:00
i2c-xiic.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-xlp9xx.c i2c: xlp9xx: Fix module autoload 2016-10-25 11:48:59 +02:00
i2c-xlr.c i2c: xlr: Fix module autoload for OF registration 2016-10-25 11:49:00 +02:00
Kconfig i2c: allow configuration of imx driver for ColdFire architecture 2016-10-25 11:48:57 +02:00
Makefile i2c: thunderx: Add i2c driver for ThunderX SOC 2016-08-26 00:41:55 +02:00
scx200_acb.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00