[PATCH v1] spi: spi-nxp-fspi: Add ACPI support

[kuldip dwivedi <kuldip.dwivedi@puresoftware.com>]

Currently NXP fspi  driver has support of DT only. Adding ACPI
support to the driver so that it can be used by UEFI firmware
booting in ACPI mode. This driver will be probed if any firmware
will expose HID "NXP0009" in DSDT table.

Signed-off-by: kuldip dwivedi <kuldip.dwivedi@puresoftware.com>
---

Notes:
    1. Add ACPI match table
    2. Change the DT specific APIs to device property APIs
       so that same API can be used in DT and ACPi mode.
    3. Omit clock configuration part - in ACPI world, the firmware
       is responsible for clock maintenance.
    4. This patch is tested on LX2160A platform

 drivers/spi/spi-nxp-fspi.c | 66 +++++++++++++++++++++++++++-----------
 1 file changed, 47 insertions(+), 19 deletions(-)

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index 1ccda82da206..acdb186ddfb2 100644
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c
@@ -3,7 +3,8 @@
 /*
  * NXP FlexSPI(FSPI) controller driver.
  *
- * Copyright 2019 NXP.
+ * Copyright 2019-2020 NXP
+ * Copyright 2020 Puresoftware Ltd.
  *
  * FlexSPI is a flexsible SPI host controller which supports two SPI
  * channels and up to 4 external devices. Each channel supports
@@ -30,6 +31,7 @@
  *     Frieder Schrempf <frieder.schrempf@kontron.de>
  */
 
+#include <linux/acpi.h>
 #include <linux/bitops.h>
 #include <linux/clk.h>
 #include <linux/completion.h>
@@ -563,6 +565,9 @@ static int nxp_fspi_clk_prep_enable(struct nxp_fspi *f)
 {
 	int ret;
 
+	if (is_acpi_node(f->dev->fwnode))
+		return 0;
+
 	ret = clk_prepare_enable(f->clk_en);
 	if (ret)
 		return ret;
@@ -576,10 +581,15 @@ static int nxp_fspi_clk_prep_enable(struct nxp_fspi *f)
 	return 0;
 }
 
-static void nxp_fspi_clk_disable_unprep(struct nxp_fspi *f)
+static int nxp_fspi_clk_disable_unprep(struct nxp_fspi *f)
 {
+	if (is_acpi_node(f->dev->fwnode))
+		return 0;
+
 	clk_disable_unprepare(f->clk);
 	clk_disable_unprepare(f->clk_en);
+
+	return 0;
 }
 
 /*
@@ -900,6 +910,8 @@ static int nxp_fspi_default_setup(struct nxp_fspi *f)
 		return ret;
 
 	/* Reset the module */
+	fspi_writel(f, FSPI_MCR0_SWRST, (base + FSPI_MCR0));
+
 	/* w1c register, wait unit clear */
 	ret = fspi_readl_poll_tout(f, f->iobase + FSPI_MCR0,
 				   FSPI_MCR0_SWRST, 0, POLL_TOUT, false);
@@ -1001,7 +1013,7 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 
 	f = spi_controller_get_devdata(ctlr);
 	f->dev = dev;
-	f->devtype_data = of_device_get_match_data(dev);
+	f->devtype_data = device_get_match_data(dev);
 	if (!f->devtype_data) {
 		ret = -ENODEV;
 		goto err_put_ctrl;
@@ -1011,6 +1023,8 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 
 	/* find the resources - configuration register address space */
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fspi_base");
+	if (!res)
+		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	f->iobase = devm_ioremap_resource(dev, res);
 	if (IS_ERR(f->iobase)) {
 		ret = PTR_ERR(f->iobase);
@@ -1020,8 +1034,11 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 	/* find the resources - controller memory mapped space */
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fspi_mmap");
 	if (!res) {
-		ret = -ENODEV;
-		goto err_put_ctrl;
+		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+		if (!res) {
+			ret = -ENODEV;
+			goto err_put_ctrl;
+		}
 	}
 
 	/* assign memory mapped starting address and mapped size. */
@@ -1029,22 +1046,24 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 	f->memmap_phy_size = resource_size(res);
 
 	/* find the clocks */
-	f->clk_en = devm_clk_get(dev, "fspi_en");
-	if (IS_ERR(f->clk_en)) {
-		ret = PTR_ERR(f->clk_en);
-		goto err_put_ctrl;
-	}
+	if (dev_of_node(&pdev->dev)) {
+		f->clk_en = devm_clk_get(dev, "fspi_en");
+		if (IS_ERR(f->clk_en)) {
+			ret = PTR_ERR(f->clk_en);
+			goto err_put_ctrl;
+		}
 
-	f->clk = devm_clk_get(dev, "fspi");
-	if (IS_ERR(f->clk)) {
-		ret = PTR_ERR(f->clk);
-		goto err_put_ctrl;
-	}
+		f->clk = devm_clk_get(dev, "fspi");
+		if (IS_ERR(f->clk)) {
+			ret = PTR_ERR(f->clk);
+			goto err_put_ctrl;
+		}
 
-	ret = nxp_fspi_clk_prep_enable(f);
-	if (ret) {
-		dev_err(dev, "can not enable the clock\n");
-		goto err_put_ctrl;
+		ret = nxp_fspi_clk_prep_enable(f);
+		if (ret) {
+			dev_err(dev, "can not enable the clock\n");
+			goto err_put_ctrl;
+		}
 	}
 
 	/* find the irq */
@@ -1127,6 +1146,14 @@ static const struct of_device_id nxp_fspi_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, nxp_fspi_dt_ids);
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id nxp_fspi_acpi_ids[] = {
+	{ "NXP0009", .driver_data = (kernel_ulong_t)&lx2160a_data, },
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, nxp_fspi_acpi_ids);
+#endif
+
 static const struct dev_pm_ops nxp_fspi_pm_ops = {
 	.suspend	= nxp_fspi_suspend,
 	.resume		= nxp_fspi_resume,
@@ -1136,6 +1163,7 @@ static struct platform_driver nxp_fspi_driver = {
 	.driver = {
 		.name	= "nxp-fspi",
 		.of_match_table = nxp_fspi_dt_ids,
+		.acpi_match_table = ACPI_PTR(nxp_fspi_acpi_ids),
 		.pm =   &nxp_fspi_pm_ops,
 	},
 	.probe          = nxp_fspi_probe,
-- 
2.17.1