thermal: ti-soc-thermal: Use GPIO descriptors

This switches the TI SoC thermal driver to use GPIO
descriptors instead of retrieveing a GPIO number from the
device tree and requesting the GPIO separately.

Cc: Keerthy <j-keerthy@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200229210532.173430-1-linus.walleij@linaro.org

drivers/thermal/ti-soc-thermal/ti-bandgap.c

@@ -15,7 +15,7 @@
 #include <linux/kernel.h>
 #include <linux/interrupt.h>
 #include <linux/clk.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/err.h>
 #include <linux/types.h>
@@ -24,7 +24,6 @@
 #include <linux/of_device.h>
 #include <linux/of_platform.h>
 #include <linux/of_irq.h>
-#include <linux/of_gpio.h>
 #include <linux/io.h>
 
 #include "ti-bandgap.h"
@@ -743,27 +742,13 @@ int ti_bandgap_get_trend(struct ti_bandgap *bgp, int id, int *trend)
 static int ti_bandgap_tshut_init(struct ti_bandgap *bgp,
 				 struct platform_device *pdev)
 {
-	int gpio_nr = bgp->tshut_gpio;
 	int status;
 
-	/* Request for gpio_86 line */
-	status = gpio_request(gpio_nr, "tshut");
-	if (status < 0) {
-		dev_err(bgp->dev, "Could not request for TSHUT GPIO:%i\n", 86);
-		return status;
-	}
-	status = gpio_direction_input(gpio_nr);
-	if (status) {
-		dev_err(bgp->dev, "Cannot set input TSHUT GPIO %d\n", gpio_nr);
-		return status;
-	}
-
-	status = request_irq(gpio_to_irq(gpio_nr), ti_bandgap_tshut_irq_handler,
+	status = request_irq(gpiod_to_irq(bgp->tshut_gpiod),
+			     ti_bandgap_tshut_irq_handler,
 			     IRQF_TRIGGER_RISING, "tshut", NULL);
-	if (status) {
-		gpio_free(gpio_nr);
+	if (status)
 		dev_err(bgp->dev, "request irq failed for TSHUT");
-	}
 
 	return 0;
 }
@@ -860,11 +845,10 @@ static struct ti_bandgap *ti_bandgap_build(struct platform_device *pdev)
 	} while (res);
 
 	if (TI_BANDGAP_HAS(bgp, TSHUT)) {
-		bgp->tshut_gpio = of_get_gpio(node, 0);
-		if (!gpio_is_valid(bgp->tshut_gpio)) {
-			dev_err(&pdev->dev, "invalid gpio for tshut (%d)\n",
-				bgp->tshut_gpio);
-			return ERR_PTR(-EINVAL);
+		bgp->tshut_gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN);
+		if (IS_ERR(bgp->tshut_gpiod)) {
+			dev_err(&pdev->dev, "invalid gpio for tshut\n");
+			return ERR_CAST(bgp->tshut_gpiod);
 		}
 	}
 
@@ -1046,10 +1030,8 @@ int ti_bandgap_probe(struct platform_device *pdev)
 put_fclock:
 	clk_put(bgp->fclock);
 free_irqs:
-	if (TI_BANDGAP_HAS(bgp, TSHUT)) {
-		free_irq(gpio_to_irq(bgp->tshut_gpio), NULL);
-		gpio_free(bgp->tshut_gpio);
-	}
+	if (TI_BANDGAP_HAS(bgp, TSHUT))
+		free_irq(gpiod_to_irq(bgp->tshut_gpiod), NULL);
 
 	return ret;
 }
@@ -1079,10 +1061,8 @@ int ti_bandgap_remove(struct platform_device *pdev)
 	if (TI_BANDGAP_HAS(bgp, TALERT))
 		free_irq(bgp->irq, bgp);
 
-	if (TI_BANDGAP_HAS(bgp, TSHUT)) {
-		free_irq(gpio_to_irq(bgp->tshut_gpio), NULL);
-		gpio_free(bgp->tshut_gpio);
-	}
+	if (TI_BANDGAP_HAS(bgp, TSHUT))
+		free_irq(gpiod_to_irq(bgp->tshut_gpiod), NULL);
 
 	return 0;
 }

drivers/thermal/ti-soc-thermal/ti-bandgap.h

@@ -13,6 +13,8 @@
 #include <linux/types.h>
 #include <linux/err.h>
 
+struct gpio_desc;
+
 /**
  * DOC: bandgap driver data structure
  * ==================================
@@ -199,7 +201,7 @@ struct ti_bandgap {
 	struct clk			*div_clk;
 	spinlock_t			lock; /* shields this struct */
 	int				irq;
-	int				tshut_gpio;
+	struct gpio_desc		*tshut_gpiod;
 	u32				clk_rate;
 };