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gpiolib: Support 'gpio-reserved-ranges' property

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Some qcom platforms make some GPIOs or pins unavailable for use by
non-secure operating systems, and thus reading or writing the registers
for those pins will cause access control issues. Add support for a DT
property to describe the set of GPIOs that are available for use so that
higher level OSes are able to know what pins to avoid reading/writing.
Non-DT platforms can add support by directly updating the
chip->valid_mask.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Tested-by: Timur Tabi <timur@codeaurora.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Stephen Boyd 2018-03-23 09:34:52 -07:00 • committed by Linus Walleij
parent ace56935ff
commit 726cb3ba49
3 changed files with 86 additions and 0 deletions
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16
include/linux/gpio/driver.h
View file

@ -288,6 +288,21 @@ struct gpio_chip {
struct gpio_irq_chip irq;
#endif
/**
* @need_valid_mask:
*
* If set core allocates @valid_mask with all bits set to one.
*/
bool need_valid_mask;
/**
* @valid_mask:
*
* If not %NULL holds bitmask of GPIOs which are valid to be used
* from the chip.
*/
unsigned long *valid_mask;
#if defined(CONFIG_OF_GPIO)
/*
* If CONFIG_OF is enabled, then all GPIO controllers described in the
@ -384,6 +399,7 @@ bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset);
/* Sleep persistence inquiry for drivers */
bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset);
bool gpiochip_line_is_valid(const struct gpio_chip *chip, unsigned int offset);
/* get driver data */
void *gpiochip_get_data(struct gpio_chip *chip);