spi: cadence-xspi: support suspend/resume

Add system wide suspend and resume support, the suspend hook
implementation is straightforward, just call spi_controller_suspend()
While the resume hook implementation is a bit complex, we need to redo
something which is done during probe, such as enable the interrupts,
setup clk and config the phy for mrvl hw overlay.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Link: https://patch.msgid.link/20260122155119.12865-1-jszhang@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-cadence-xspi.c b/drivers/spi/spi-cadence-xspi.c
index 72384d90d1133f1c0a342c3afd00e0ba18c5ed88..895b4b3276a56d7b4b436d63cf849e2160f35183 100644 (file)
--- a/drivers/spi/spi-cadence-xspi.c
+++ b/drivers/spi/spi-cadence-xspi.c
@@ -350,6 +350,7 @@ static const int cdns_mrvl_xspi_clk_div_list[] = {
 
 struct cdns_xspi_dev {
        struct platform_device *pdev;
+       struct spi_controller *host;
        struct device *dev;
 
        void __iomem *iobase;
@@ -1159,9 +1160,10 @@ static int cdns_xspi_probe(struct platform_device *pdev)
        }
        host->bus_num = -1;
 
-       platform_set_drvdata(pdev, host);
+       platform_set_drvdata(pdev, cdns_xspi);
 
        cdns_xspi->pdev = pdev;
+       cdns_xspi->host = host;
        cdns_xspi->dev = &pdev->dev;
        cdns_xspi->cur_cs = 0;
 
@@ -1250,6 +1252,30 @@ static int cdns_xspi_probe(struct platform_device *pdev)
        return 0;
 }
 
+static int cdns_xspi_suspend(struct device *dev)
+{
+       struct cdns_xspi_dev *cdns_xspi = dev_get_drvdata(dev);
+
+       return spi_controller_suspend(cdns_xspi->host);
+}
+
+static int cdns_xspi_resume(struct device *dev)
+{
+       struct cdns_xspi_dev *cdns_xspi = dev_get_drvdata(dev);
+
+       if (cdns_xspi->driver_data->mrvl_hw_overlay) {
+               cdns_mrvl_xspi_setup_clock(cdns_xspi, MRVL_DEFAULT_CLK);
+               cdns_xspi_configure_phy(cdns_xspi);
+       }
+
+       cdns_xspi->set_interrupts_handler(cdns_xspi, false);
+
+       return spi_controller_resume(cdns_xspi->host);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(cdns_xspi_pm_ops,
+                               cdns_xspi_suspend, cdns_xspi_resume);
+
 static const struct of_device_id cdns_xspi_of_match[] = {
        {
                .compatible = "cdns,xspi-nor",
@@ -1268,6 +1294,7 @@ static struct platform_driver cdns_xspi_platform_driver = {
        .driver = {
                .name = CDNS_XSPI_NAME,
                .of_match_table = cdns_xspi_of_match,
+               .pm = pm_sleep_ptr(&cdns_xspi_pm_ops),
        },
 };