23 Oct, 2014
40 commits
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Use driver model for exynos5 board SPI flash.
Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
Convert sandbox's spi flash emulation driver to use driver model.
Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
We want the SPI flash probing feature to operate as a standard driver.
Add a driver for the basic probing feature used by most boards. This
will be activated by device_probe() as with any other driver.The 'sf probe' command currently keeps track of the SPI slave that it
last used. This doesn't work with driver model, since some other driver
or system may have probed the device and have access to it too. On the
other hand, if we try to probe a device twice the second probe is a nop
with driver model.Fix this by searching for the matching device, removing it, and then
probing it again. This should work as expected regardless of other device
activity.Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
Add a driver model uclass for SPI flash which supports the common
operations (read, write, erase). Since we must keep support for the
non-dm interface, some modification of the spi_flash header is required.CONFIG_DM_SPI_FLASH is used to enable driver model for SPI flash.
Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
Adjust spi_flash_probe_slave() to return an error value instead of a
pointer so we get the correct error return.Have the caller allocate memory for spi_flash to simplify error handling,
and also so that driver model can use its existing allocated memory.Add a spi.h include in the sf_params file.
Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
Since spi_flash.h is supposed to be the public API for SPI flash, move
private things to sf_internal.h. Also tidy up a few comment nits.Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
Adjust this board to use the driver model soft_spi implementation.
Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
This README is intended to help maintainers move their SPI drivers over to
driver model. It works through the required steps with an example.Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
Move the exynos SPI driver over to driver model. This removes quite a bit
of boilerplate from the driver, although it adds some for driver model.A few device tree additions are needed to make the SPI flash available.
Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
Add a new implementation of soft_spi that uses device tree to specify the
GPIOs. This will replace soft_spi_legacy for boards which use driver model.Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
This feature provides for init of a single SPI port for the soft SPI
feature. It is not really compatible with driver model since it assumes a
single SPI port. Also, inserting SPI init into the driver by means of
a #define is not very nice.This feature is not used by any active boards, so let's remove it.
Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
Reserve the 'normal' name for use by driver model, and rename the old
driver so that it is clear that it is for 'legacy' drivers only.Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
Adjust the sandbox SPI driver to support driver model and move sandbox over
to driver model for SPI.Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
Driver model uses a different way to find the SPI bus and slave from the
numbered devices given on the command line. Adjust the code to suit.We use a generic SPI device, and attach it to the SPI bus before performing
the transaction.Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
Some files are using SPI functions but not explitly including the SPI
header file. Fix this, since driver model needs it.Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
Driver model does its own init, so we don't need this.
There is still a call in board_f.c but it is only enabled by CONFIG_HARD_SPI.
It is easy enough to disable that option when converting boards which use
it to driver model.Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
U-Boot includes a SPI emulation driver already but it is not explicit, and
is hidden in the SPI flash code.Conceptually with sandbox's SPI implementation we have a layer which
creates SPI bus transitions and a layer which interprets them, currently
only for SPI flash. The latter is actually an emulation, and it should be
possible to add more than one emulation - not just SPI flash.Add a SPI emulation uclass so that other emulations can be plugged in to
support different types of emulated devices on difference buses/chip
selects.Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki -
Add a uclass which provides access to SPI buses and includes operations
required by SPI.For a time driver model will need to co-exist with the legacy SPI interface
so some parts of the header file are changed depending on which is in use.
The exports are adjusted also since some functions are not available with
driver model.Boards must define CONFIG_DM_SPI to use driver model for SPI.
Signed-off-by: Simon Glass
Reviewed-by: Jagannadha Sutradharudu Teki
(Discussed some follow-up comments which will address in future add-ons) -
The sequence number is unique within the uclass, so state this clearly.
Signed-off-by: Simon Glass
Acked-by: Jagannadha Sutradharudu Teki -
Buses sometimes want to pass data to their children when they are probed.
For example, a SPI bus may want to tell the slave device about the chip
select it is connected to.Add a new function to permit the parent data to be supplied to the child.
Signed-off-by: Simon Glass
Acked-by: Jagannadha Sutradharudu Teki -
Buses need to iterate through their children in some situations. Add a few
functions to make this easy.Signed-off-by: Simon Glass
Acked-by: Jagannadha Sutradharudu Teki -
Add a SPI device which can be used for testing SPI flash features in
sandbox.Also add a cros_ec device since with driver model the Chrome OS EC
emulation will not otherwise be available.Reviewed-by: Jagannadha Sutradharudu Teki
Signed-off-by: Simon Glass -
Change the Exynos serial driver to work with driver model and switch over
all relevant boards to use it.Signed-off-by: Simon Glass
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We will need the console before relocation, so mark it that way.
Signed-off-by: Simon Glass
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Convert the exynos GPIO driver to driver model. This implements the generic
GPIO interface but not the extra Exynos-specific functions.Signed-off-by: Simon Glass
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With driver model GPIOs must be requested before use. Make sure this is
done correctly.(Note that the soft SPI part of universal is omitted, since this driver
is about to be replaced with a driver-model-aware version)Signed-off-by: Simon Glass
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The defines at the top of the GPIO driver use single-character names for
parameters which are not very descriptive.Improve these to use descriptive parameter names.
Signed-off-by: Simon Glass
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The wrong header is being included, thus requiring the code to re-declare
the generic GPIO interface in each GPIO header.Fix this.
Signed-off-by: Simon Glass
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The generic board deadline is approaching, and we need this feature to
enable driver model. Enable CONFIG_SYS_GENERIC_BOARD for s5p_goni.Signed-off-by: Simon Glass
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The generic board deadline is approaching, and we need this feature to
enable driver model. Enable CONFIG_SYS_GENERIC_BOARD for smdkc100.Signed-off-by: Simon Glass
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These describe the GPIOs in enough detail for U-Boot's GPIO driver to
operate.Signed-off-by: Simon Glass
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These describe the GPIOs in enough detail for U-Boot's GPIO driver to
operate.Signed-off-by: Simon Glass
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The pinctrl bindings used by Linux are an incomplete description of the
hardware. It is possible in most cases to determine the register address
of each, but not in all cases. By adding an additional property we can
fix this, and avoid adding a table to U-Boot for every single Exynos
SOC.Signed-off-by: Simon Glass
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We don't include the pinctrl functions for U-Boot as they use up quite
a bit of space and are not used.We could instead perhaps eliminate this material with fdtgrep, but so far
this tool has not made it to upstream.Signed-off-by: Simon Glass
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Bring in required device tree files for pinctrl from Linux v3.14. These
are initially unchanged and have a number of pieces not needed by U-Boot.Note that exynos5420 is renamed to exynos54xx here since we want to
support exynos5422 also.Signed-off-by: Simon Glass
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We should be consistent about this. The kernel has moved to #include
which breaks error reporting to some extent but does allow us to include
binding files.Signed-off-by: Simon Glass
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Add proper initialization of GPIO pins used by software i2c.
Signed-off-by: Robert Baldyga
Acked-by: Simon Glass -
The driver model supports two ways for passing device parameters;
Device Tree and platform_data (board file).
Each driver should generally support both of them because some
popular IPs are used on various platforms.Assume the following scenario:
- The driver Foo is used on SoC Bar and SoC Baz
- The SoC Bar uses Device Tree control (CONFIG_OF_CONTROL=y)
- The SoC Baz does not support Device Tree; uses a board fileIn this situation, the device driver Foo should work with/without
the device tree control. The driver should have .of_match and
.ofdata_to_platdata members for SoC Bar, while they are meaningless
for SoC Baz; therefore those device-tree control code should go
inside #ifdef CONFIG_OF_CONTROL.The driver code will be like this:
#ifdef CONFIG_OF_CONTROL
static const struct udevice_id foo_of_match = {
{ .compatible = "foo_driver" },
{},
}static int foo_ofdata_to_platdata(struct udevice *dev)
{
...
}
#endifU_BOOT_DRIVER(foo_driver) = {
...
.of_match = of_match_ptr(foo_of_match),
.ofdata_to_platdata = of_match_ptr(foo_ofdata_to_platdata),
...
}This idea has been borrowed from Linux.
(In Linux, this macro is defined in include/linux/of.h)Signed-off-by: Masahiro Yamada
Acked-by: Simon Glass -
Signed-off-by: Masahiro Yamada
Acked-by: Simon Glass -
The header files include/dm/platdata.h and include/dm/uclass.h
use ll_entry_declare(); therefore they depend on
include/linker_lists.h.Signed-off-by: Masahiro Yamada
Acked-by: Simon Glass
