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pinctrl: msm: Add ability for drivers to supply a reserved GPIO list 

When booting MSM based platforms with Device Tree or some ACPI
implementations, it is possible to provide a list of reserved pins
via the 'gpio-reserved-ranges' and 'gpios' properties respectively.
However some ACPI tables are not populated with this information,
thus it has to come from a knowledgable device driver instead.

Here we provide the MSM common driver with additional support to
parse this informtion and correctly populate the widely used
'valid_mask'.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Lee Jones 2019-06-10 09:42:08 +01:00 committed by Linus Walleij
parent a188339ca5
commit 4c0efbfb26
2 changed files with 19 additions and 0 deletions
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18
drivers/pinctrl/qcom/pinctrl-msm.c
View File

@ -607,8 +607,23 @@ static int msm_gpio_init_valid_mask(struct gpio_chip *chip)
int ret;
unsigned int len, i;
unsigned int max_gpios = pctrl->soc->ngpios;
const int *reserved = pctrl->soc->reserved_gpios;
u16 *tmp;
/* Driver provided reserved list overrides DT and ACPI */
if (reserved) {
bitmap_fill(chip->valid_mask, max_gpios);
for (i = 0; reserved[i] >= 0; i++) {
if (i >= max_gpios || reserved[i] >= max_gpios) {
dev_err(pctrl->dev, "invalid list of reserved GPIOs\n");
return -EINVAL;
}
clear_bit(reserved[i], chip->valid_mask);
}
return 0;
}
/* The number of GPIOs in the ACPI tables */
len = ret = device_property_read_u16_array(pctrl->dev, "gpios", NULL,
0);
@ -964,6 +979,9 @@ static void msm_gpio_irq_handler(struct irq_desc *desc)
static bool msm_gpio_needs_valid_mask(struct msm_pinctrl *pctrl)
{
if (pctrl->soc->reserved_gpios)
return true;
return device_property_read_u16_array(pctrl->dev, "gpios", NULL, 0) > 0;
}

1
drivers/pinctrl/qcom/pinctrl-msm.h
View File

@ -121,6 +121,7 @@ struct msm_pinctrl_soc_data {
bool pull_no_keeper;
const char *const *tiles;
unsigned int ntiles;
const int *reserved_gpios;
};
extern const struct dev_pm_ops msm_pinctrl_dev_pm_ops;