From: Fenglin Wu <fengl...@codeaurora.org>
Add support for qcom,gpios-disallowed property which is used to exclude
PMIC GPIOs not owned by the APSS processor from the pinctrl device.
Signed-off-by: Fenglin Wu <fengl...@codeaurora.org>
---
.../devicetree/bindings/pinctrl/qcom,pmic-gpio.txt | 12 ++
drivers/pinctrl/qcom/pinctrl-spmi-gpio.c | 202 +++++++++++++++++----
2 files changed, 176 insertions(+), 38 deletions(-)
diff --git a/Documentation/devicetree/bindings/pinctrl/qcom,pmic-gpio.txt
b/Documentation/devicetree/bindings/pinctrl/qcom,pmic-gpio.txt
index 8d893a8..435efe8 100644
--- a/Documentation/devicetree/bindings/pinctrl/qcom,pmic-gpio.txt
+++ b/Documentation/devicetree/bindings/pinctrl/qcom,pmic-gpio.txt
@@ -43,6 +43,17 @@ PMIC's from Qualcomm.
the first cell will be used to define gpio number and the
second denotes the flags for this gpio
+- qcom,gpios-disallowed:
+ Usage: optional
+ Value type: <prop-encoded-array>
+ Definition: Array of the GPIO hardware numbers corresponding to GPIOs
+ which the APSS processor is not allowed to configure.
+ The hardware numbers are indexed from 1.
+ The interrupt resources for these GPIOs must not be defined
+ in "interrupts" and "interrupt-names" properties.
+ GPIOs defined in this array won't be registered as pins
+ in the pinctrl device or gpios in the gpio chip.
+
Please refer to ../gpio/gpio.txt and ../interrupt-controller/interrupts.txt for
a general description of GPIO and interrupt bindings.
@@ -206,6 +217,7 @@ Example:
gpio-controller;
#gpio-cells = <2>;
+ qcom,gpios-disallowed = <1 20>;
pm8921_gpio_keys: gpio-keys {
volume-keys {
diff --git a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
index 664b641..74821af 100644
--- a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
+++ b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
@@ -96,6 +96,7 @@
* struct pmic_gpio_pad - keep current GPIO settings
* @base: Address base in SPMI device.
* @irq: IRQ number which this GPIO generate.
+ * @gpio_idx: The index in GPIO's hardware number space (1-based)
* @is_enabled: Set to false when GPIO should be put in high Z state.
* @out_value: Cached pin output value
* @have_buffer: Set to true if GPIO output could be configured in push-pull,
@@ -112,6 +113,7 @@
struct pmic_gpio_pad {
u16 base;
int irq;
+ int gpio_idx;
bool is_enabled;
bool out_value;
bool have_buffer;
@@ -130,6 +132,7 @@ struct pmic_gpio_state {
struct regmap *map;
struct pinctrl_dev *ctrl;
struct gpio_chip chip;
+ const char **gpio_groups;
};
static const struct pinconf_generic_params pmic_gpio_bindings[] = {
@@ -231,7 +234,9 @@ static int pmic_gpio_get_function_groups(struct pinctrl_dev
*pctldev,
const char *const **groups,
unsigned *const num_qgroups)
{
- *groups = pmic_gpio_groups;
+ struct pmic_gpio_state *state = pinctrl_dev_get_drvdata(pctldev);
+
+ *groups = state->gpio_groups;
*num_qgroups = pctldev->desc->npins;
return 0;
}
@@ -455,7 +460,7 @@ static void pmic_gpio_config_dbg_show(struct pinctrl_dev
*pctldev,
pad = pctldev->desc->pins[pin].drv_data;
- seq_printf(s, " gpio%-2d:", pin + PMIC_GPIO_PHYSICAL_OFFSET);
+ seq_printf(s, " gpio%-2d:", pad->gpio_idx);
val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_EN_CTL);
@@ -546,13 +551,29 @@ static int pmic_gpio_of_xlate(struct gpio_chip *chip,
const struct of_phandle_args *gpio_desc,
u32 *flags)
{
+ int i;
+ struct pmic_gpio_state *state = gpiochip_get_data(chip);
+ struct pinctrl_desc *desc = state->ctrl->desc;
+ struct pmic_gpio_pad *pad;
+
if (chip->of_gpio_n_cells < 2)
return -EINVAL;
if (flags)
*flags = gpio_desc->args[1];
- return gpio_desc->args[0] - PMIC_GPIO_PHYSICAL_OFFSET;
+ for (i = 0; i < chip->ngpio; i++) {
+ pad = desc->pins[i].drv_data;
+ if (pad->gpio_idx == gpio_desc->args[0]) {
+ dev_dbg(state->dev, "gpio%-2d xlate to pin%-2d\n",
+ gpio_desc->args[0], i);
+ return i;
+ }
+ }
+
+ dev_err(state->dev, "Couldn't find pin for gpio %d\n",
+ gpio_desc->args[0]);
+ return -ENODEV;
}
static int pmic_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
@@ -688,43 +709,124 @@ static int pmic_gpio_probe(struct platform_device *pdev)
struct pinctrl_desc *pctrldesc;
struct pmic_gpio_pad *pad, *pads;
struct pmic_gpio_state *state;
- int ret, npins, i;
- u32 reg;
+ int ret, npins, ngpios, i, j, pin_idx;
+ int disallowed_count = 0;
+ u32 reg[2], start, size;
+ u32 *disallowed = NULL;
- ret = of_property_read_u32(dev->of_node, "reg", ®);
+ ret = of_property_read_u32_array(dev->of_node, "reg", reg, 2);
if (ret < 0) {
- dev_err(dev, "missing base address");
+ dev_err(dev, "reg property reading failed\n");
return ret;
}
+ start = reg[0];
+ size = reg[1];
+
+ ngpios = size / PMIC_GPIO_ADDRESS_RANGE;
+ if (ngpios == 0) {
+ dev_err(dev, "no gpios assigned\n");
+ return -ENODEV;
+ }
- npins = platform_irq_count(pdev);
- if (!npins)
+ if (ngpios > ARRAY_SIZE(pmic_gpio_groups)) {
+ dev_err(dev, "reg property defines %d gpios, but only %d are
allowed\n",
+ ngpios, (int)ARRAY_SIZE(pmic_gpio_groups));
return -EINVAL;
- if (npins < 0)
- return npins;
+ }
+
+ if (of_find_property(dev->of_node, "qcom,gpios-disallowed",
+ &disallowed_count)) {
+ disallowed_count /= sizeof(u32);
+ if (disallowed_count == 0) {
+ dev_err(dev, "No data in gpios-disallowed\n");
+ return -EINVAL;
+ }
- BUG_ON(npins > ARRAY_SIZE(pmic_gpio_groups));
+ disallowed = kcalloc(disallowed_count, sizeof(u32), GFP_KERNEL);
+ if (disallowed == NULL)
+ return -ENOMEM;
+
+ ret = of_property_read_u32_array(dev->of_node,
+ "qcom,gpios-disallowed",
+ disallowed, disallowed_count);
+ if (ret < 0) {
+ dev_err(dev, "qcom,gpios-disallowed property reading
failed, ret=%d\n",
+ ret);
+ goto err_free;
+ }
+
+ for (i = 0; i < disallowed_count; i++) {
+ if (disallowed[i] >= ngpios + PMIC_GPIO_PHYSICAL_OFFSET
+ || disallowed[i] < PMIC_GPIO_PHYSICAL_OFFSET) {
+ dev_err(dev, "invalid gpio = %d specified in
qcom,gpios-disallowed, supported values: %d to %d\n",
+ disallowed[i],
+ PMIC_GPIO_PHYSICAL_OFFSET,
+ ngpios - 1 + PMIC_GPIO_PHYSICAL_OFFSET);
+ ret = -EINVAL;
+ goto err_free;
+ }
+ for (j = 0; j < i; j++) {
+ if (disallowed[i] == disallowed[j]) {
+ dev_err(dev, "duplicate gpio = %d
listed in qcom,gpios-disallowed\n",
+ disallowed[i]);
+ ret = -EINVAL;
+ goto err_free;
+ }
+ }
+ dev_dbg(dev, "gpio %d NOT supported\n", disallowed[i]);
+ }
+ } else {
+ disallowed_count = 0;
+ }
+
+ npins = ngpios - disallowed_count;
+ if (npins <= 0) {
+ dev_err(dev, "No pins assigned\n");
+ ret = -ENODEV;
+ goto err_free;
+ }
+ if (platform_irq_count(pdev) != npins) {
+ dev_err(dev, "%d IRQs defined but %d expected\n",
+ platform_irq_count(pdev), npins);
+ ret = -EINVAL;
+ goto err_free;
+ }
state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
- if (!state)
- return -ENOMEM;
+ if (!state) {
+ ret = -ENOMEM;
+ goto err_free;
+ }
platform_set_drvdata(pdev, state);
state->dev = &pdev->dev;
state->map = dev_get_regmap(dev->parent, NULL);
+ state->gpio_groups = devm_kcalloc(dev, sizeof(*state->gpio_groups),
+ npins, GFP_KERNEL);
+ if (!state->gpio_groups) {
+ ret = -ENOMEM;
+ goto err_free;
+ }
+
pindesc = devm_kcalloc(dev, npins, sizeof(*pindesc), GFP_KERNEL);
- if (!pindesc)
- return -ENOMEM;
+ if (!pindesc) {
+ ret = -ENOMEM;
+ goto err_free;
+ }
pads = devm_kcalloc(dev, npins, sizeof(*pads), GFP_KERNEL);
- if (!pads)
- return -ENOMEM;
+ if (!pads) {
+ ret = -ENOMEM;
+ goto err_free;
+ }
pctrldesc = devm_kzalloc(dev, sizeof(*pctrldesc), GFP_KERNEL);
- if (!pctrldesc)
- return -ENOMEM;
+ if (!pctrldesc) {
+ ret = -ENOMEM;
+ goto err_free;
+ }
pctrldesc->pctlops = &pmic_gpio_pinctrl_ops;
pctrldesc->pmxops = &pmic_gpio_pinmux_ops;
@@ -738,22 +840,42 @@ static int pmic_gpio_probe(struct platform_device *pdev)
#ifdef CONFIG_DEBUG_FS
pctrldesc->custom_conf_items = pmic_conf_items;
#endif
+ for (pin_idx = 0, i = 0; i < ngpios; i++) {
+ for (j = 0; j < disallowed_count; j++) {
+ if (i + PMIC_GPIO_PHYSICAL_OFFSET == disallowed[j])
+ break;
+ }
+ if (j != disallowed_count)
+ continue;
- for (i = 0; i < npins; i++, pindesc++) {
- pad = &pads[i];
+ pad = &pads[pin_idx];
pindesc->drv_data = pad;
- pindesc->number = i;
+ pindesc->number = pin_idx;
pindesc->name = pmic_gpio_groups[i];
- pad->irq = platform_get_irq(pdev, i);
- if (pad->irq < 0)
- return pad->irq;
+ pad->gpio_idx = i + PMIC_GPIO_PHYSICAL_OFFSET;
+ pad->irq = platform_get_irq(pdev, pin_idx);
+ if (pad->irq < 0) {
+ dev_err(state->dev,
+ "failed to get irq for gpio %d (pin %d),
ret=%d\n",
+ pad->gpio_idx, pin_idx, pad->irq);
+ ret = pad->irq;
+ goto err_free;
+ }
+ /* Every pin is a group */
+ state->gpio_groups[pin_idx] = pmic_gpio_groups[i];
- pad->base = reg + i * PMIC_GPIO_ADDRESS_RANGE;
+ pad->base = start + i * PMIC_GPIO_ADDRESS_RANGE;
ret = pmic_gpio_populate(state, pad);
- if (ret < 0)
- return ret;
+ if (ret < 0) {
+ dev_err(state->dev,
+ "failed to populate gpio %d, ret=%d\n",
+ i, ret);
+ goto err_free;
+ }
+ pindesc++;
+ pin_idx++;
}
state->chip = pmic_gpio_gpio_template;
@@ -765,25 +887,29 @@ static int pmic_gpio_probe(struct platform_device *pdev)
state->chip.can_sleep = false;
state->ctrl = devm_pinctrl_register(dev, pctrldesc, state);
- if (IS_ERR(state->ctrl))
- return PTR_ERR(state->ctrl);
+ if (IS_ERR(state->ctrl)) {
+ ret = PTR_ERR(state->ctrl);
+ dev_err(state->dev, "failed to register pinctrl device,
ret=%d\n",
+ ret);
+ goto err_free;
+ }
ret = gpiochip_add_data(&state->chip, state);
if (ret) {
- dev_err(state->dev, "can't add gpio chip\n");
- return ret;
+ dev_err(state->dev, "can't add gpio chip, ret=%d\n", ret);
+ goto err_free;
}
ret = gpiochip_add_pin_range(&state->chip, dev_name(dev), 0, 0, npins);
if (ret) {
- dev_err(dev, "failed to add pin range\n");
- goto err_range;
+ dev_err(dev, "failed to add pin range\n, ret=%d\n", ret);
+ gpiochip_remove(&state->chip);
+ goto err_free;
}
- return 0;
+err_free:
+ kfree(disallowed);
-err_range:
- gpiochip_remove(&state->chip);
return ret;
}
--
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.
