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From:   kuldip dwivedi <kuldip.dwivedi@puresoftware.com>
To:     Ashish Kumar <ashish.kumar@nxp.com>,
        Yogesh Gaur <yogeshgaur.83@gmail.com>,
        Mark Brown <broonie@kernel.org>, linux-spi@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     Varun Sethi <V.Sethi@nxp.com>, Arokia Samy <arokia.samy@nxp.com>,
        Ard Biesheuvel <Ard.Biesheuvel@arm.com>,
        Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@arm.com>,
        Paul Yang <Paul.Yang@arm.com>,
        kuldip dwivedi <kuldip.dwivedi@puresoftware.com>
Subject: [PATCH v3] spi: spi-nxp-fspi: Add ACPI support
Date:   Fri, 11 Sep 2020 18:33:31 +0530
Message-Id: <20200911130331.6313-1-kuldip.dwivedi@puresoftware.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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, NXP members are added to confirm HID for FSPI
    2. Change the DT specific APIs to device property APIs
       so that same API can be used in DT and ACPi mode.
    3. Add node specific checks to use indexed based lookup API in case of
       ACPI.
    	if (is_acpi_node(f->dev->fwnode))
    		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    	else
    		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fspi_base");
    4. Omit clock configuration part - in ACPI world, the firmware
       is responsible for clock maintenance.
    5. This patch is tested on LX2160A platform

 drivers/spi/spi-nxp-fspi.c | 69 +++++++++++++++++++++++++++-----------
 1 file changed, 50 insertions(+), 19 deletions(-)

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index 1ccda82da206..0d41406c036d 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;
 }
 
 /*
@@ -1001,7 +1011,7 @@ 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;
@@ -1010,7 +1020,12 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, f);
 
 	/* find the resources - configuration register address space */
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fspi_base");
+	if (is_acpi_node(f->dev->fwnode))
+		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	else
+		res = platform_get_resource_byname(pdev,
+				IORESOURCE_MEM, "fspi_base");
+
 	f->iobase = devm_ioremap_resource(dev, res);
 	if (IS_ERR(f->iobase)) {
 		ret = PTR_ERR(f->iobase);
@@ -1018,7 +1033,12 @@ 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 (is_acpi_node(f->dev->fwnode))
+		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	else
+		res = platform_get_resource_byname(pdev,
+				IORESOURCE_MEM, "fspi_mmap");
+
 	if (!res) {
 		ret = -ENODEV;
 		goto err_put_ctrl;
@@ -1029,22 +1049,24 @@ 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 +1149,14 @@ 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 +1166,7 @@ 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