spi: omap2-mcspi: Activate pinctrl idle state during runtime suspend

Set the (optional) idle pinctrl state during runtime suspend. This is the
same schema used in PL022 driver and can help with HW designs sharing
the SPI lines for different purposes.
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Link: https://lore.kernel.org/r/20210222023243.491432-1-alexander.sverdlin@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-omap2-mcspi.c

@@ -1327,6 +1327,17 @@ static int omap2_mcspi_controller_setup(struct omap2_mcspi *mcspi)
 	return 0;
 }
 
+static int omap_mcspi_runtime_suspend(struct device *dev)
+{
+	int error;
+
+	error = pinctrl_pm_select_idle_state(dev);
+	if (error)
+		dev_warn(dev, "%s: failed to set pins: %i\n", __func__, error);
+
+	return 0;
+}
+
 /*
  * When SPI wake up from off-mode, CS is in activate state. If it was in
  * inactive state when driver was suspend, then force it to inactive state at
@@ -1338,6 +1349,11 @@ static int omap_mcspi_runtime_resume(struct device *dev)
 	struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
 	struct omap2_mcspi_regs *ctx = &mcspi->ctx;
 	struct omap2_mcspi_cs *cs;
+	int error;
+
+	error = pinctrl_pm_select_default_state(dev);
+	if (error)
+		dev_warn(dev, "%s: failed to set pins: %i\n", __func__, error);
 
 	/* McSPI: context restore */
 	mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, ctx->modulctrl);
@@ -1566,11 +1582,6 @@ static int __maybe_unused omap2_mcspi_resume(struct device *dev)
 	struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
 	int error;
 
-	error = pinctrl_pm_select_default_state(dev);
-	if (error)
-		dev_warn(mcspi->dev, "%s: failed to set pins: %i\n",
-			 __func__, error);
-
 	error = spi_master_resume(master);
 	if (error)
 		dev_warn(mcspi->dev, "%s: master resume failed: %i\n",
@@ -1582,6 +1593,7 @@ static int __maybe_unused omap2_mcspi_resume(struct device *dev)
 static const struct dev_pm_ops omap2_mcspi_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(omap2_mcspi_suspend,
 				omap2_mcspi_resume)
+	.runtime_suspend	= omap_mcspi_runtime_suspend,
 	.runtime_resume		= omap_mcspi_runtime_resume,
 };