mfd: tc6393xb: Make disable callback return void

All implementations return 0, so simplify accordingly.

This is a preparation for making platform remove callbacks return void.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220619082655.53728-1-u.kleine-koenig@pengutronix.de

arch/arm/mach-pxa/eseries.c

@@ -86,11 +86,10 @@ int eseries_tmio_enable(struct platform_device *dev)
 	return 0;
 }
 
-int eseries_tmio_disable(struct platform_device *dev)
+void eseries_tmio_disable(struct platform_device *dev)
 {
 	gpio_set_value(GPIO_ESERIES_TMIO_SUSPEND, 0);
 	gpio_set_value(GPIO_ESERIES_TMIO_PCLR, 0);
-	return 0;
 }
 
 int eseries_tmio_suspend(struct platform_device *dev)

arch/arm/mach-pxa/tosa.c

@@ -678,13 +678,11 @@ static int tosa_tc6393xb_enable(struct platform_device *dev)
 	return rc;
 }
 
-static int tosa_tc6393xb_disable(struct platform_device *dev)
+static void tosa_tc6393xb_disable(struct platform_device *dev)
 {
 	gpio_free(TOSA_GPIO_TC6393XB_L3V_ON);
 	gpio_free(TOSA_GPIO_TC6393XB_SUSPEND);
 	gpio_free(TOSA_GPIO_TC6393XB_REST_IN);
-
-	return 0;
 }
 
 static int tosa_tc6393xb_resume(struct platform_device *dev)

drivers/mfd/tc6393xb.c

@@ -798,20 +798,19 @@ static int tc6393xb_remove(struct platform_device *dev)
 {
 	struct tc6393xb_platform_data *tcpd = dev_get_platdata(&dev->dev);
 	struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
-	int ret;
 
 	mfd_remove_devices(&dev->dev);
 
 	tc6393xb_detach_irq(dev);
 
-	ret = tcpd->disable(dev);
+	tcpd->disable(dev);
 	clk_disable_unprepare(tc6393xb->clk);
 	iounmap(tc6393xb->scr);
 	release_resource(&tc6393xb->rscr);
 	clk_put(tc6393xb->clk);
 	kfree(tc6393xb);
 
-	return ret;
+	return 0;
 }
 
 #ifdef CONFIG_PM

include/linux/mfd/tc6393xb.h

@@ -22,7 +22,7 @@ struct tc6393xb_platform_data {
 	u16	scr_gper;	/* GP Enable */
 
 	int	(*enable)(struct platform_device *dev);
-	int	(*disable)(struct platform_device *dev);
+	void	(*disable)(struct platform_device *dev);
 	int	(*suspend)(struct platform_device *dev);
 	int	(*resume)(struct platform_device *dev);