linux-kernel - [RFT PATCH 14/21] hte: tegra194: don't access struct gpio

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Message-Id: <20230905185309.131295-15-brgl@bgdev.pl>
Date:   Tue,  5 Sep 2023 20:53:02 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Aaro Koskinen <aaro.koskinen@....fi>,
        Janusz Krzysztofik <jmkrzyszt@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Dipen Patel <dipenp@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-acpi@...r.kernel.org, timestamp@...ts.linux.dev,
        linux-tegra@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [RFT PATCH 14/21] hte: tegra194: don't access struct gpio_chip

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

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@...aro.org>
---
 drivers/hte/hte-tegra194.c | 36 +++++++++++++++++++++++-------------
 1 file changed, 23 insertions(+), 13 deletions(-)

diff --git a/drivers/hte/hte-tegra194.c b/drivers/hte/hte-tegra194.c
index 9fd3c00ff695..d83ef30c9588 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[] = {
@@ -676,16 +679,18 @@ 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)
-{
-	return !strcmp(chip->label, data);
-}
-
 static int tegra_gpiochip_match(struct gpio_chip *chip, void *data)
 {
 	return chip->fwnode == of_node_to_fwnode(data);
 }
 
+static void tegra_hte_put_gpio_device(void *data)
+{
+	struct gpio_device *gdev = data;
+
+	gpio_device_put(gdev);
+}
+
 static int tegra_hte_probe(struct platform_device *pdev)
 {
 	int ret;
@@ -763,8 +768,8 @@ 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 +780,19 @@ 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(gpio_ctrl,
+							 tegra_gpiochip_match);
 			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;
-- 
2.39.2