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7ef97e9a31
Having a board where the I2C bus locks up occasionally made it clear that the bus recovery in the i2c-davinci driver will only work on some boards, because on regular boards, this will only toggle GPIO lines that aren't muxed to the actual pins. The I2C controller on SoCs like da850 (and da830), Keystone 2 has the built-in capability to bit-bang its lines by using the ICPFUNC registers of the i2c controller. Implement the suggested procedure by toggling SCL and checking SDA using the ICPFUNC registers of the I2C controller when present. Allow platforms to indicate the presence of the ICPFUNC registers with a has_pfunc platform data flag and add optional DT property "ti,has-pfunc" to indicate the same in DT. Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Alexander Sverdlin <alexander.sverdlin@nokia.com> Tested-by: Michael Lawnick <michael.lawnick@nokia.com> Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca> Signed-off-by: Mike Looijmans <milo-software@users.sourceforge.net> [grygorii.strashko@ti.com: combined patches from Ben Gardiner and Mike Looijmans and reimplemented ICPFUNC bus recovery using I2C bus recovery infrastructure] Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
28 lines
913 B
C
28 lines
913 B
C
/*
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* DaVinci I2C controller platform_device info
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*
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* Author: Vladimir Barinov, MontaVista Software, Inc. <source@mvista.com>
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*
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* 2007 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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#ifndef __ASM_ARCH_I2C_H
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#define __ASM_ARCH_I2C_H
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/* All frequencies are expressed in kHz */
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struct davinci_i2c_platform_data {
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unsigned int bus_freq; /* standard bus frequency (kHz) */
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unsigned int bus_delay; /* post-transaction delay (usec) */
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unsigned int sda_pin; /* GPIO pin ID to use for SDA */
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unsigned int scl_pin; /* GPIO pin ID to use for SCL */
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bool has_pfunc; /*chip has a ICPFUNC register */
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};
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/* for board setup code */
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void davinci_init_i2c(struct davinci_i2c_platform_data *);
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#endif /* __ASM_ARCH_I2C_H */
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