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path: root/drivers/gpio/gpio-uclass.c
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* gpio: Drop dm_gpio_set_dir()Simon Glass2021-04-121-11/+0
| | | | | | | This function is not used. Drop it. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
* gpio: Add a way to read 3-way strapping pinsSimon Glass2021-03-031-0/+81
| | | | | | | | | | | | | | | | | | | | | Using the internal vs. external pull resistors it is possible to get 27 different combinations from 3 strapping pins. Add an implementation of this. This involves updating the sandbox GPIO driver to model external and (weaker) internal pull resistors. The get_value() method now takes account of what is driving a pin: sandbox: GPIOD_EXT_DRIVEN - in which case GPIO_EXT_HIGH provides the value outside source - in which case GPIO_EXT_PULL_UP/DOWN indicates the external state and we work the final state using those flags and the internal GPIOD_PULL_UP/DOWN flags Of course the outside source does not really exist in sandbox. We are just modelling it for test purpose. Signed-off-by: Simon Glass <sjg@chromium.org>
* gpio: Define the log category in the uclassSimon Glass2021-03-031-0/+2
| | | | | | This uses log_debug(), etc. but does not define the category. Fix this. Signed-off-by: Simon Glass <sjg@chromium.org>
* gpio: Use an 'ops' variable everywhereSimon Glass2021-03-031-11/+14
| | | | | | | | | | Update this driver to use the common method of putting the driver operations in an 'ops' variable install of calling gpio_get_ops() repeatedly. Make it const since operations do not change. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
* gpio: Replace direction_input() and direction_output()Simon Glass2021-03-031-9/+6
| | | | | | | | | | The new update_flags() method is more flexible since it allows the driver to see the full flags all at once. Use that in preference to these two functions. Add comments to that effect. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
* dm: gpio: Add a way to update flagsSimon Glass2021-03-031-17/+58
| | | | | | | | | | | | | | | | | | | | | | | | | | | It is convenient to be able to adjust some of the flags for a GPIO while leaving others alone. Add a function for this. Update dm_gpio_set_dir_flags() to make use of this. Also update dm_gpio_set_value() to use this also, since this allows the open-drain / open-source features to be implemented directly in the driver, rather than using the uclass workaround. Update the sandbox tests accordingly. This involves a lot of changes to dm_test_gpio_opendrain_opensource() since we no-longer have the direciion being reported differently depending on the open drain/open source flags. Also update the STM32 drivers to let the uclass handle the active low/high logic. Drop the GPIOD_FLAGS_OUTPUT() macro which is no-longer used. Signed-off-by: Simon Glass <sjg@chromium.org> Tested-by: Kory Maincent <kory.maincent@bootlin.com> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Tested-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Tested-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
* gpio: Rename dm_gpio_get_dir_flags() to dm_gpio_get_flags()Simon Glass2021-03-031-1/+1
| | | | | | | | | This function can be used to get any flags, not just direction flags. Rename it to avoid confusion. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
* dm: gpio: Rename get_dir_flags() method to get_flags()Simon Glass2021-03-031-15/+15
| | | | | | | | | | | | | | It is more useful to be able to read all the flags, not just the direction ones. In fact this is what the STM32 driver does. Update the method name to reflect this. Tweak the docs a little and use 'flagsp' as the return argument, as is common in driver model, to indicate it returns a value. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
* dm: gpio: Rename set_dir_flags() method to update_flags()Simon Glass2021-03-031-8/+8
| | | | | | | | | | | | The current method is a misnomer since it is also used (e.g. by stm32) to update pull settings and open source/open drain. Rename it and expand the documentation to cover a few more details. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Pratyush Yadav <p.yadav@ti.com> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
* gpio: Disable functions not used with of-platdataSimon Glass2021-03-031-0/+2
| | | | | | | | | | | | | | | | | | These functions use devicetree and cannot work with of-platdata, which has no runtime devicetree. If they are used, the current linker error is confusing, since it talks about missing functions in the bowels of driver model. Avoid compiling these functions at all with of-platdata, so that a straightforward link error points to the problem. Series-changes; 3 - Fix 'wprl' typo Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
* common: Drop asm/global_data.h from common headerSimon Glass2021-02-021-0/+1
| | | | | | | | | | | | Move this out of the common header and include it only where needed. In a number of cases this requires adding "struct udevice;" to avoid adding another large header or in other cases replacing / adding missing header files that had been pulled in, very indirectly. Finally, we have a few cases where we did not need to include <asm/global_data.h> at all, so remove that include. Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Rini <trini@konsulko.com>
* dm: Rename DM_GET_DRIVER() to DM_DRIVER_GET()Simon Glass2021-01-051-1/+1
| | | | | | | | In the spirit of using the same base name for all of these related macros, rename this to have the operation at the end. This is not widely used so the impact is fairly small. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: Use access methods for dev/uclass private dataSimon Glass2021-01-051-1/+1
| | | | | | | | | | | Most drivers use these access methods but a few do not. Update them. In some cases the access is not permitted, so mark those with a FIXME tag for the maintainer to check. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Pratyush Yadav <p.yadav@ti.com>
* dm: treewide: Rename ofdata_to_platdata() to of_to_plat()Simon Glass2020-12-131-2/+2
| | | | | | | This name is far too long. Rename it to remove the 'data' bits. This makes it consistent with the platdata->plat rename. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: treewide: Rename dev_get_platdata() to dev_get_plat()Simon Glass2020-12-131-2/+2
| | | | | | Rename this to be consistent with the change from 'platdata'. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: treewide: Rename 'platdata' variables to just 'plat'Simon Glass2020-12-131-1/+1
| | | | | | | | | | We use 'priv' for private data but often use 'platdata' for platform data. We can't really use 'pdata' since that is ambiguous (it could mean private or platform data). Rename some of the latter variables to end with 'plat' for consistency. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: treewide: Rename auto_alloc_size members to be shorterSimon Glass2020-12-131-3/+3
| | | | | | | | | | | | This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
* gpio: Convert to use APIs which support live DTPatrick Delaunay2020-12-011-3/+2
| | | | | | | | | Use ofnode_ or dev_ APIs instead of fdt_ and fdtdec_ APIs so that the driver can support live DT. Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Heiko Schocher <hs@denx.de>
* drivers: gpio: Add a managed API to get a GPIO from the device-treeJean-Jacques Hiblot2020-09-301-0/+71
| | | | | | | | | | | | Add managed functions to get a gpio from the devce-tree, based on a property name (minus the '-gpios' suffix) and optionally an index. When the device is unbound, the GPIO is automatically released and the data structure is freed. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
* gpio: Add a method to convert a GPIO to ACPISimon Glass2020-07-171-0/+22
| | | | | | | | | | When generating ACPI tables we need to convert GPIOs in U-Boot to the ACPI structures required by ACPI. This is a SoC-specific conversion and cannot be handled by generic code, so add a new GPIO method to do the conversion. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
* gpio: search for gpio label if gpio is not found through bank nameHeiko Schocher2020-07-071-0/+46
| | | | | | | | | | | | | | | | | | | | | dm_gpio_lookup_name() searches for a gpio through the bank name. But we have also gpio labels, and it makes sense to search for a gpio also in the labels we have defined, if no gpio is found through the bank name definition. This is useful for example if you have a wp pin on different gpios on different board versions. If dm_gpio_lookup_name() searches also for the gpio labels, you can give the gpio an unique label name and search for this label, and do not need to differ between board revisions. Signed-off-by: Heiko Schocher <hs@denx.de> Reviewed-by: Simon Glass <sjg@chromium.org> [trini: Don't enable by default] Signed-off-by: Tom Rini <trini@konsulko.com>
* gpio-uclass.c: save the GPIOD flags also in the gpio descriptorHeiko Schocher2020-07-051-4/+4
| | | | | | | | | | save the GPIOD_ flags also in the gpio descriptor. Signed-off-by: Heiko Schocher <hs@denx.de> Reviewed-by: Patrick Delaunay <patrick.delaunay@st.com> Fixes: 788ea834124b ("gpio: add function _dm_gpio_set_dir_flags") Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Walter Lozano <walter.lozano@collabora.com>
* common: Drop log.h from common headerSimon Glass2020-05-181-1/+2
| | | | | | Move this header out of the common header. Signed-off-by: Simon Glass <sjg@chromium.org>
* gpio: emulate open drain & open source in dm_gpio_set_value()Neil Armstrong2020-05-111-0/+15
| | | | | | | | | | | Handle the GPIOD_OPEN_DRAIN & GPIOD_OPEN_SOURCE flags to emulate open drain and open source by setting the GPIO line as input depending on the requested value. The behaviour is taken from the Linux gpiolib. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* gpio: add ops to set dir flagsPatrick Delaunay2020-04-161-5/+12
| | | | | | | | | | | | | | | | | | | Add the ops for GPIO driver set_dir_flags() to set the dir flags. The user can update the direction and configuration of each GPIO with a only call to dm_gpio_set_dir_flags() or dm_gpio_set_dir() and respecting the configuration provided by device tree (saved in desc->flags). When these optional ops are absent, the gpio uclass use the mandatory ops (direction_output, direction_input, get_value) and desc->flags to manage only the main dir flags: - GPIOD_IS_IN - GPIOD_IS_OUT - GPIOD_IS_OUT_ACTIVE - GPIOD_ACTIVE_LOW Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* gpio: add ops to get dir flagsPatrick Delaunay2020-04-161-6/+25
| | | | | | | | | | | | | | | | | Add the ops for GPIO driver get_dir_flags(), allows to get dynamically the current gpio configuration; it is used by the API function dm_gpio_get_dir_flags(). When these optional ops are absent, the gpio uclass continues to use the mandatory ops (direction_output, direction_input, get_value) and value of desc->flags to manage only the main dir flags: - GPIOD_IS_IN - GPIOD_IS_OUT - GPIOD_IS_OUT_ACTIVE - GPIOD_ACTIVE_LOW Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* gpio: add support of new GPIO direction flagPatrick Delaunay2020-04-161-0/+30
| | | | | | | | | | | | | | | | | | | | | | | | | | | This commit manages the new dir flags that can be used in gpio specifiers to indicate the pull-up or pull-down resistor configuration for output gpio (GPIO_PULL_UP, GPIO_PULL_DOWN) or the Open Drain/Open Source configuration for input gpio (GPIO_OPEN_DRAIN, GPIO_OPEN_SOURCE). These flags are already supported in Linux kernel in gpio lib. This patch only parse and save the direction flags in GPIO descriptor (desc->flags), it prepares the introduction of new ops to manage them. The GPIO uclass supports new GPIO flags from device-tree (GPIO_XXX define in include/dt-bindings/gpio/gpio.h) and translate them in the dir flags (GPIOD_XXX): - GPIO_PULL_UP => GPIOD_PULL_UP - GPIO_PULL_DOWN => GPIOD_PULL_DOWN - GPIO_OPEN_DRAIN => GPIOD_OPEN_DRAIN - GPIO_OPEN_SOURCE => GPIOD_OPEN_SOURCE This patch also adds protection in the check_dir_flags function for new invalid configuration of the dir flags. Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* gpio: update dir_flags managementPatrick Delaunay2020-04-161-2/+25
| | | | | | | | | | | | | | Update the flag management in GPIO uclass: the desc->flags is always combined with the requested flags and the GPIO descriptor is updated for further call. Add a function dm_gpio_get_dir_flags to get dynamically the current dir_flags (configuration and value). This patch prepare introduction of the dir flags support with new ops. Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* gpio: add helper GPIOD_FLAGS_OUTPUTPatrick Delaunay2020-04-161-6/+3
| | | | | | | | Add a macro to provide the GPIO output value according the dir flags content. Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* gpio: add function check_dir_flagsPatrick Delaunay2020-04-161-0/+25
| | | | | | | | Add a dir flags validity check with a new function check_dir_flags. Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* gpio: add function _dm_gpio_set_dir_flagsPatrick Delaunay2020-04-161-13/+25
| | | | | | | | | | | | Introduce the function _dm_gpio_set_dir_flags to set dir flags without check if the GPIO is reserved. Separate the reserved check for "set_dir" and "set_dir_flags". This patch is a preliminary step to add new ops. Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* gpio: add function _gpio_get_valuePatrick Delaunay2020-04-161-4/+10
| | | | | | | | | Introduce the function _gpio_get_value to get the GPIO value without check if it is reserved. This patch prepare new ops introduction. Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* gpio: add gpio descriptor initialization helperPatrick Delaunay2020-04-161-8/+19
| | | | | | | | | | Add a helper function gpio_desc_init() to initialize the gpio descriptor; with this function the flags will be always set to 0. It wasn't the case before this patch in dm_gpio_lookup_name. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
* gpio: remove the open_drain API and opsPatrick Delaunay2020-04-161-36/+0
| | | | | | | | | | | | | | This patch removes the ops get_open_drain/set_open_drain and the API dm_gpio_get_open_drain/dm_gpio_set_open_drain. The ops only provided in one driver (mpc8xxx gpio) and the associated API is never called in boards. This patch prepare a more generic set/get_dir_flags ops, including the open drain property. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
* gpio: Rename free() to rfree()Simon Glass2020-02-051-4/+4
| | | | | | | | This function name conflicts with our desire to #define free() to something else on sandbox. Since it deals with resources, rename it to rfree(). Signed-off-by: Simon Glass <sjg@chromium.org>
* spl: Allow tiny printf() to be controlled in SPL and TPLSimon Glass2019-10-081-2/+2
| | | | | | | | | | | | At present there is only one control for this and it is used for both SPL and TPL. But SPL might have a lot more space than TPL so the extra cost of a full printf() might be acceptable. Split the option into two, providing separate SPL and TPL controls. The TPL setting defaults to the same as SPL. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
* gpio: fixes for gpio-hog supportHeiko Schocher2019-07-291-28/+75
| | | | | | | | recently added gpio hog patch was "in discussion" state with Simon Glass. This patch now adds most of comments from Simon Glass. Signed-off-by: Heiko Schocher <hs@denx.de>
* gpio: add gpio-hog supportHeiko Schocher2019-07-131-16/+165
| | | | | | | | | | | | | add gpio-hog support. GPIO hogging is a mechanism providing automatic GPIO request and configuration as part of the gpio-controller's driver probe function. for more infos see: doc/device-tree-bindings/gpio/gpio.txt Signed-off-by: Heiko Schocher <hs@denx.de> Tested-by: Michal Simek <michal.simek@xilinx.com> (zcu102) Tested-by: Patrick Delaunay <patrick.delaunay@st.com>
* gpio: dm: Support manual relocation for gpioMichal Simek2018-07-191-0/+35
| | | | | | | | | Relocate gpio ops as was done by: "dm: Add support for all targets which requires MANUAL_RELOC" (sha1: 484fdf5ba058b07be5ca82763aa2b72063540ef3) Signed-off-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* SPDX: Convert all of our single license tags to Linux Kernel styleTom Rini2018-05-071-2/+1
| | | | | | | | | | | | | | | | | | | | When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
* gpio: uclass: Fix debug stringMario Six2018-04-061-1/+1
| | | | | | | | A debug string still has the old name of a function being called; update it. Signed-off-by: Mario Six <mario.six@gdsys.cc> Reviewed-by: Simon Glass <sjg@chromium.org>
* gpio: add static to get_function()Masahiro Yamada2017-07-061-2/+2
| | | | | | Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* dm: gpio: Add live tree supportSimon Glass2017-06-011-28/+23
| | | | | | | | | | | Add support for requesting GPIOs with a live device tree. This involves adjusting the function signature for the legacy function gpio_request_by_name_nodev(), so fix up all callers. Signed-off-by: Simon Glass <sjg@chromium.org> Fixes to stm32f746-disco.c: Signed-off-by: Tom Rini <trini@konsulko.com>
* dm: gpio: Refactor to prepare for live tree supportSimon Glass2017-06-011-21/+30
| | | | | | | | | | Move the main part of the GPIO request function into a separate function so that it can be used by the live tree function when added. Update the xlate method to use a node reference. Update all GPIO drivers to handle the modified xlate() method. Signed-off-by: Simon Glass <sjg@chromium.org>
* gpio-uclass.c: Fix comparison of unsigned expression warningTom Rini2017-05-121-1/+1
| | | | | | | | | | | We declare that gpio_base (which is the base for counting gpios, not an address) is unsigned. Therefore the comparison with >= 0 is always true. As the desire is to allow for this base number to be 0, we can just drop this check. Reported by clang-3.8. Cc: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* dm: core: Replace of_offset with accessorSimon Glass2017-02-081-3/+3
| | | | | | | | | At present devices use a simple integer offset to record the device tree node associated with the device. In preparation for supporting a live device tree, which uses a node pointer instead, refactor existing code to access this field through an inline function. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: gpio: Add methods for open drain settingmario.six@gdsys.cc2016-06-031-0/+32
| | | | | | | | | | | | | | | | Certain GPIO devices have the capability to switch their GPIOs into open-drain mode, that is, instead of actively driving the output (Push-pull output), the pin is connected to the collector (for a NPN transistor) or the drain (for a MOSFET) of a transistor, respectively. The pin then either forms an open circuit or a connection to ground, depending on the state of the transistor. This patch adds functions to the GPIO uclass to switch GPIOs to open-drain mode on devices that support it. Signed-off-by: Mario Six <mario.six@gdsys.cc> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: York Sun <york.sun@nxp.com>
* dm: gpio: add a default gpio xlate routineEric Nelson2016-05-171-7/+23
| | | | | | | | | | | | | | | | | Many drivers use a common form of offset + flags for device tree nodes. e.g.: <&gpio1 2 GPIO_ACTIVE_LOW> This patch adds a common implementation of this type of parsing and calls it when a gpio driver doesn't supply its' own xlate routine. This will allow removal of the driver-specific versions in a handful of drivers and simplify the addition of new drivers. Signed-off-by: Eric Nelson <eric@nelint.com> Reviewed-by: Stephen Warren <swarren@nvidia.com> Acked-by: Simon Glass <sjg@chromium.org>
* gpio: Use const where possibleSimon Glass2016-03-171-5/+5
| | | | | | | | Some functions do not change the struct gpio_desc parameter. Update these to use const so this is clear. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
* gpio: Add a function to obtain a GPIO vector valueSimon Glass2016-03-171-0/+18
| | | | | | | | | | We can use GPIOs as binary digits for reading 'strapping' values. Each GPIO is assigned a single bit and can be set high or low on the circuit board. We already have a legacy function for reading these values. Add one that supports driver model. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
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