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  1. 11 9月, 2018 1 次提交
    • L
      gpio: of: Handle SPI chipselect legacy bindings · 6953c57a
      由 Linus Walleij 提交于 
      The SPI chipselects are assumed to be active low in the current
binding, so when we want to use GPIO descriptors and handle
the active low/high semantics in gpiolib, we need a special
parsing quirk to deal with this.

We check for the property "spi-cs-high" and if that is
NOT present we assume the CS line is active low.

If the line is tagged as active low in the device tree and
has no "spi-cs-high" property all is fine, the device
tree and the SPI bindings are in agreement.

If the line is tagged as active high in the device tree with
the second cell flag and has no "spi-cs-high" property we
enforce active low semantics (as this is the exception we can
just tag on the flag).

If the line is tagged as active low with the second cell flag
AND tagged with "spi-cs-high" the SPI active high property
takes precedence and we print a warning.

Cc: Mark Brown <broonie@kernel.org>
Cc: linux-spi@vger.kernel.org
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
      6953c57a
  3. 10 9月, 2018 16 次提交
  5. 04 9月, 2018 7 次提交
  7. 31 8月, 2018 1 次提交
  9. 30 8月, 2018 3 次提交
    • J
      gpio: brcmstb: allow 0 width GPIO banks · bfba223d
      由 Justin Chen 提交于 
      Sometimes we have empty banks within the GPIO block. This commit allows
proper handling of 0 width GPIO banks. We handle 0 width GPIO banks by
incrementing the bank and number of GPIOs, but not initializing them.
This will mean a call into the non-existent GPIOs will return an error.

Also remove "GPIO registered" dev print. This information is misleading
since the incremented banks and gpio_base do not reflect the actual GPIOs
that get initialized. We leave this information out since it is already
printed with dev_dbg.
Signed-off-by: NJustin Chen <justinpopo6@gmail.com>
Acked-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
      bfba223d
    • L
      gpio: ftgpio: Support debounce timer · 36f3f19a
      由 Linus Walleij 提交于 
      The FTGPIO010 has a debounce timer or rather prescaler that
will affect interrupts fireing off the block. We can support
this to get proper debounce on e.g. keypresses.

Since the same prescaler is used across all GPIO lines of
the silicon block, we need to bail out if the prescaler is
already set and in use by another line.

If the prescaler is already set to what we need, fine, we
reuse it. This happens more often than not when the same
debounce time is set for several GPIO keys, so we support
that usecase easily with this code.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
      36f3f19a
    • L
      gpio: ftgpio: Support optional silicon clock · da02d794
      由 Linus Walleij 提交于 
      The GPIO silicon is clocked with a PCLK (peripheral clock)
on all systems, however not all platforms model it and include
it in e.g. the device tree, so add clock handling but make it
optional so we bail out safely if it is e.g. always on.
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
      da02d794
  11. 29 8月, 2018 12 次提交