[PATCH 3/8] pinctrl: msm: Add ability for drivers to supply a reserved GPIO list

Lee Jones
2019-06-04T10:45:04Z

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>
---
drivers/pinctrl/qcom/pinctrl-msm.c | 18 ++++++++++++++++++
drivers/pinctrl/qcom/pinctrl-msm.h | 1 +
2 files changed, 19 insertions(+)

diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index ee8119879c4c..b77f22348907 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -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; i < max_gpios && 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;
}

diff --git a/drivers/pinctrl/qcom/pinctrl-msm.h b/drivers/pinctrl/qcom/pinctrl-msm.h
index c12048e54a6f..23b93ae92269 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.h
+++ b/drivers/pinctrl/qcom/pinctrl-msm.h
@@ -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;
--
2.17.1