On 10/10/23 9:19 AM, Dipen Patel wrote:
> On 10/10/23 8:17 AM, Andy Shevchenko wrote:
>> From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
>>
>> Using struct gpio_chip is not safe as it will disappear if the
>> underlying driver is unbound for any reason. Switch to using reference
>> counted struct gpio_device and its dedicated accessors.
>>
>> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
>> Tested-by: Dipen Patel <dipenp@xxxxxxxxxx>
>> Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
>> [andy: used gpio_device_find_by_fwnode()]
>> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
>> ---
>> drivers/hte/hte-tegra194.c | 33 +++++++++++++++++++--------------
>> 1 file changed, 19 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/hte/hte-tegra194.c b/drivers/hte/hte-tegra194.c
>> index 9fd3c00ff695..339ff5921ec8 100644
>> --- a/drivers/hte/hte-tegra194.c
>> +++ b/drivers/hte/hte-tegra194.c
>> @@ -132,7 +132,7 @@ struct tegra_hte_soc {
>> const struct tegra_hte_data *prov_data;
>> struct tegra_hte_line_data *line_data;
>> struct hte_chip *chip;
>> - struct gpio_chip *c;
>> + struct gpio_device *gdev;
>> void __iomem *regs;
>> };
>>
>> @@ -421,7 +421,7 @@ static int tegra_hte_line_xlate(struct hte_chip *gc,
>> * HTE/GTE namespace.
>> */
>> if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO && !args) {
>> - line_id = desc->attr.line_id - gs->c->base;
>> + line_id = desc->attr.line_id - gpio_device_get_base(gs->gdev);
>> map = gs->prov_data->map;
>> map_sz = gs->prov_data->map_sz;
>> } else if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO && args) {
>> @@ -643,12 +643,15 @@ static irqreturn_t tegra_hte_isr(int irq, void *dev_id)
>> static bool tegra_hte_match_from_linedata(const struct hte_chip *chip,
>> const struct hte_ts_desc *hdesc)
>> {
>> + struct gpio_device *gdev __free(gpio_device_put) = NULL;
>> struct tegra_hte_soc *hte_dev = chip->data;
>>
>> if (!hte_dev || (hte_dev->prov_data->type != HTE_TEGRA_TYPE_GPIO))
>> return false;
>>
>> - return hte_dev->c == gpiod_to_chip(hdesc->attr.line_data);
>> + gdev = gpiod_to_device(hdesc->attr.line_data);
>> +
>> + return hte_dev->gdev == gdev;
>> }
>>
>> static const struct of_device_id tegra_hte_of_match[] = {
>> @@ -676,14 +679,11 @@ static void tegra_gte_disable(void *data)
>> tegra_hte_writel(gs, HTE_TECTRL, 0);
>> }
>>
>> -static int tegra_get_gpiochip_from_name(struct gpio_chip *chip, void *data)
>> +static void tegra_hte_put_gpio_device(void *data)
>> {
>> - return !strcmp(chip->label, data);
>> -}
>> + struct gpio_device *gdev = data;
>>
>> -static int tegra_gpiochip_match(struct gpio_chip *chip, void *data)
>> -{
>> - return chip->fwnode == of_node_to_fwnode(data);
>> + gpio_device_put(gdev);
>> }
>>
>> static int tegra_hte_probe(struct platform_device *pdev)
>> @@ -763,8 +763,8 @@ static int tegra_hte_probe(struct platform_device *pdev)
>>
>> if (of_device_is_compatible(dev->of_node,
>> "nvidia,tegra194-gte-aon")) {
>> - hte_dev->c = gpiochip_find("tegra194-gpio-aon",
>> - tegra_get_gpiochip_from_name);
>> + hte_dev->gdev =
>> + gpio_device_find_by_label("tegra194-gpio-aon");
>> } else {
>> gpio_ctrl = of_parse_phandle(dev->of_node,
>> "nvidia,gpio-controller",
>> @@ -775,14 +775,19 @@ static int tegra_hte_probe(struct platform_device *pdev)
>> return -ENODEV;
>> }
>>
>> - hte_dev->c = gpiochip_find(gpio_ctrl,
>> - tegra_gpiochip_match);
>> + hte_dev->gdev =
>> + gpio_device_find_by_fwnode(of_fnode_handle(gpio_ctrl));
I think there is typo for of_fnode*. Should it be of_fwnode*?
>> of_node_put(gpio_ctrl);
>> }
>>
>> - if (!hte_dev->c)
>> + if (!hte_dev->gdev)
>> return dev_err_probe(dev, -EPROBE_DEFER,
>> "wait for gpio controller\n");
>> +
>> + ret = devm_add_action_or_reset(dev, tegra_hte_put_gpio_device,
>> + hte_dev->gdev);
>> + if (ret)
>> + return ret;
>> }
>>
>> hte_dev->chip = gc;
>
> Looks good to me, I will wait for others to comment and will test out (2,3,4
> also) probably end of the day 11th Oct.
>
