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  1. 10 Aug, 2018 7 commits
    • Biju Das's avatar
      gpiolib: Avoid calling chip->request() for unused gpios · 3789f5ac
      Biju Das authored 
      Add a check for unused gpios to avoid chip->request() call to client
driver for unused gpios.
Signed-off-by: default avatarBiju Das <biju.das@bp.renesas.com>
Reviewed-by: default avatarFabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      3789f5ac
    • Linus Walleij's avatar
      gpio: tegra: Include the right header · 21041dab
      Linus Walleij authored 
      This is a GPIO driver so include only <linux/gpio/driver.h>.
Drop the use of GPIOF_* flags: these are for consumers, not
drivers. Just return 0/1.

Cc: Stefan Agner <stefan@agner.ch>
Cc: Thierry Reding <treding@nvidia.com>
Reviewed-by: default avatarDmitry Osipenko <digetx@gmail.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      21041dab
    • Linus Walleij's avatar
      gpio: mmio: Fix up inverted direction registers · d799a4de
      Linus Walleij authored 
      The bgpio_init() takes one of two arguments to specify a register
to set the direction of the GPIO line: either dirout that
indicates that a 1 in the bit in that register sets the
corresponding line to output, or dirin which indicates that
a 1 in the bit in that register sets the corresponding line to
input. Conversely setting the bit to 0 on these will turn the
line into input and output respectively. One of these can
be defined but not both.

This means that a platform that sets a bit to 1 for output
only defines dirout and a platform that sets a bit to 0 for
output only defines dirin. In short this defines the polarity
of the direction register.

Both can also be left as NULL meaning the GPIO chip is either
input only or output only.

Tomer Maimon discovered that for get/set chips (those where the
get and set registers are defined but no separate clear register,
and specifying BGPIOF_READ_OUTPUT_REG_SET so that we say we
want to read the output value from the SET register)
we are unconditionally reading the value from the SET register
when the direction bit is 1 and from the DAT register when the
direction bit is 0, not taking the direction bit polarity into
account.

It would be expected that when the direction bit is inverted
(dirin is defined but not dirout) we read the current value from
the DAT register when the bit is 1 and from the SET register
when the bit is 0.

Currently only some versions of ATH79, brcmstb, some versions of
CLP711x, GE, IOP and Loongson use the dirin mode (a 1 in the
register means input). They are unaffected because
BGPIOF_READ_OUTPUT_REG_SET is not set on any of them. (They
do not read back the SET register to figure out the output
value.) So this is no regression with current drivers.

However the behaviour is wrong and does not work with Tomer's
new driver where he needs to use the BGIOF_READ_OUTPUT_REG_SET.
This fixes the above issue by:

- Instead of defining separate functions for the inverted case,
  set up a flag in the gpio_chip that indicates that the
  direction is inverted.
- Remove the special inverted functions for setting
  input/output and getting the direction, rely on the flag
  instead.
- Respect this flag in bgpio_get_set() and
  bgpio_get_set_multiple()
Reported-by: default avatarTomer Maimon <tmaimon77@gmail.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      d799a4de
    • Linus Walleij's avatar
      gpio: xilinx: Use the right include · 516df4eb
      Linus Walleij authored 
      This is a GPIO driver so use only <linux/gpio/driver.h>.
Acked-by: default avatarMichal Simek <michal.simek@xilinx.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      516df4eb
    • Linus Walleij's avatar
      gpio: timberdale: Include the right header · 50fe83a3
      Linus Walleij authored 
      This is a GPIO driver so include only <linux/gpio/driver.h>.

Cc: Richard Röjfors <richard.rojfors@gmail.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      50fe83a3
    • Linus Walleij's avatar
      gpio: tb10x: Use the right include · 32e49b9a
      Linus Walleij authored 
      This driver includes the legacy <linux/gpio.h> and
<linux/of_gpio.h> but all it needs is really <linux/gpio/driver.h>.
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      32e49b9a
    • Biju Das's avatar
      gpiolib: Fix of_node inconsistency · 6ff04974
      Biju Das authored 
      Some platforms are not setting of_node in the driver. On these platforms
defining gpio-reserved-ranges on device tree leads to kernel crash.

It is due to some parts of the gpio core relying on the driver to set up
of_node,while other parts do themselves.This inconsistent behaviour leads
to a crash.

gpiochip_add_data_with_key() calls gpiochip_init_valid_mask() with of_node
as NULL. of_gpiochip_add() fills "of_node" and calls
of_gpiochip_init_valid_mask().

The fix is to move the assignment to chip->of_node from of_gpiochip_add()
to gpiochip_add_data_with_key().
Signed-off-by: default avatarBiju Das <biju.das@bp.renesas.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Tested-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      6ff04974
  3. 06 Aug, 2018 9 commits
  5. 02 Aug, 2018 1 commit
  7. 30 Jul, 2018 1 commit
  9. 29 Jul, 2018 10 commits
  11. 16 Jul, 2018 2 commits
  13. 13 Jul, 2018 7 commits
  15. 09 Jul, 2018 3 commits
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