提交 · 3a205be5e8746aac70d4f5083cef4b3becfbab91 · openeuler / Kernel

15 6月, 2013 6 次提交

i2c: nomadik: support elder Nomadiks · 3a205be5

由 Linus Walleij 提交于 6月 10, 2013

The Nomadik I2C block was introduced with the Nomadik STn8815
SoC (the STn8810 incidentally is identical to the one named
i2c-stu300.c). However as developments have only been tested
on the DB8500 family, it was not properly working with the
STn8815 anymore.

Rectify this by adding some vendor variant data in the same
manner as other PrimeCells, and switch code path depending
on version.

Tested on the S8815 Nomadik dongle.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

3a205be5

i2c: mv64xxx: Add Allwinner sun4i compatible · 3d66ac7d

由 Maxime Ripard 提交于 6月 12, 2013

Add the compatible string for the Allwinner A10 i2c controller and the
associated register layout.
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Tested-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

3d66ac7d

i2c: mv64xxx: make the registers offset configurable · 004e8ed7

由 Maxime Ripard 提交于 6月 12, 2013

The Allwinner i2c controller uses the same logic as the Marvell one, but
with slightly different register offsets.

Introduce a structure that will be passed by either the pdata or
associated to the compatible strings, and that holds the various
registers that might be needed.
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Tested-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

004e8ed7

i2c: mv64xxx: Add macros to access parts of registers · 683e69b8

由 Maxime Ripard 提交于 6月 12, 2013

These macros make it more comprehensive to access to useful masked and
shifted area of the various registers used.
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Tested-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

683e69b8

i2c: vt8500: Add support for I2C bus on Wondermedia SoCs · 560746eb

由 Tony Prisk 提交于 6月 15, 2013

This patch adds support for the I2C bus controllers found on Wondermedia
8xxx-series SoCs. Only master-mode is supported.
Signed-off-by: NTony Prisk <linux@prisktech.co.nz>
[wsa: fixed one macro to shift 8 instead of 16]
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

560746eb

i2c: designware: fix race between subsequent xfers · 38d7fade

由 Christian Ruppert 提交于 6月 07, 2013

The designware block is not always properly disabled in the case of
transfer errors. Interrupts from aborted transfers might be handled
after the data structures for the following transfer are initialised but
before the hardware is set up. This can corrupt the data structures to
the point that the system is stuck in an infinite interrupt loop (where
FIFOs are never emptied because dev->msg_read_idx == dev->msgs_num).

This patch cleanly disables the designware-i2c hardware at the end of
every transfer, be it successful or not.
Signed-off-by: NChristian Ruppert <christian.ruppert@abilis.com>
[wsa: extended the comment]
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

38d7fade

13 6月, 2013 7 次提交

i2c: bfin-twi: Read and write the FIFO in loop · 8419c8de

由 Sonic Zhang 提交于 5月 28, 2013

TWI transfer interrupts may be lost when system is heavily handling other
interrupts, while current transfer handler depends on each accurate interrupt
and misses some data in this case. Because there are 2 2-byte FIFOs in blackfin
TWI controller, the occurrence of the data loss can be reduced by reading till
the RX FIFO is empty and writing till the TX FIFO is full.
Reported-by: NBob Maris <mail@maris-ee.eu>
Signed-off-by: NSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

8419c8de

i2c: core: make it possible to match a pure device tree driver · c80f5284

由 Linus Walleij 提交于 5月 13, 2013

This tries to address an issue found when writing an MFD driver
for the Nomadik STw481x PMICs: as the platform is using device
tree exclusively I want to specify the driver matching like
this:

static const struct of_device_id stw481x_match[] = {
	{ .compatible = "st,stw4810", },
	{ .compatible = "st,stw4811", },
	{},
};

static struct i2c_driver stw481x_driver = {
	.driver = {
		.name	= "stw481x",
		.of_match_table = stw481x_match,
	},
	.probe		= stw481x_probe,
	.remove		= stw481x_remove,
};

However that turns out not to be possible: the I2C probe code
is written so that the probe() call is always passed a match
from i2c_match_id() using non-devicetree matches.

This is probably why most devices using device tree for I2C
clients currently will pass no .of_match_table *at all* but
instead just use .id_table from struct i2c_driver to match
the device. As you realize that means that the whole idea with
compatible strings is discarded, and that is why we find strange
device tree I2C device compatible strings like "product" instead
of "vendor,product" as you could expect.

Let's figure out how to fix this before the mess spreads. This
patch will allow probeing devices with only an of_match_table
as per above, and will pass NULL as the second argument to the
probe() function. If the driver wants to deduce secondary info
from the struct of_device_id .data field, it has to call
of_match_device() on its own match table in the probe function
device tree probe path.

If drivers define both an .of_match_table *AND* a i2c_driver
.id_table, the .of_match_table will take precedence, just
as is done in the i2c_device_match() function in i2c-core.c.

I2C devices probed from device tree should subsequently be
fixed to handle the case where of_match_table() is
used (I think none of them do that today), and platforms should
fix their device trees to use compatible strings for I2C devices
instead of setting the name to Linux device driver names as is
done in multiple cases today.

Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Grant Likely <grant.likely@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

c80f5284

i2c: use platform_{get,set}_drvdata() · c2c64954

由 Jingoo Han 提交于 5月 23, 2013

Use the wrapper functions for getting and setting the driver data using
platform_device instead of using dev_{get,set}_drvdata() with &pdev->dev,
so we can directly pass a struct platform_device.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

c2c64954

drivers/i2c/busses: don't check resource with devm_ioremap_resource · 3cc2d009

由 Wolfram Sang 提交于 5月 10, 2013

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

3cc2d009

i2c: designware: prevent signals from aborting I2C transfers · e42dba56

由 Mika Westerberg 提交于 5月 22, 2013

If a process receives signal while it is waiting for I2C transfer to
complete, an error is returned to the caller and the transfer is aborted.
This can cause the driver to fail subsequent transfers. Also according to
commit d295a86e (i2c: mv64xxx: work around signals causing I2C
transactions to be aborted) I2C drivers aren't supposed to abort
transactions on signals.

To prevent this switch to use wait_for_completion_timeout() instead of
wait_for_completion_interruptible_timeout() in the designware I2C driver.
Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: NChristian Ruppert <christian.ruppert@abilis.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

e42dba56

i2c: mxs: Let device core handle pinctrl · dfda7d8f

由 Fabio Estevam 提交于 5月 06, 2013

Since commit ab78029e (drivers/pinctrl: grab default handles from device core),
we can rely on device core for handling pinctrl.

So remove devm_pinctrl_get_select_default() from the driver.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

dfda7d8f

i2c: imx: Let device core handle pinctrl · 76b1f723

由 Fabio Estevam 提交于 5月 06, 2013

Since commit ab78029e (drivers/pinctrl: grab default handles from device core),
we can rely on device core for handling pinctrl.

So remove devm_pinctrl_get_select_default() from the driver.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

76b1f723

06 6月, 2013 9 次提交

I2C: mv64xxx: fix race between FSM/interrupt and process context · 4243fa0b