[PATCH] mtd: nand: atmel_nand: retrieve NFC clock

[Alexandre Belloni]

From: Boris BREZILLON <boris.brezil...@free-electrons.com>

Signed-off-by: Boris BREZILLON <boris.brezil...@free-electrons.com>
---
 drivers/mtd/nand/atmel_nand.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 9c5f717bda54..ba64b1c91314 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -27,6 +27,7 @@
  *
  */
 
+#include <linux/clk.h>
 #include <linux/dma-mapping.h>
 #include <linux/slab.h>
 #include <linux/module.h>
@@ -96,6 +97,8 @@ struct atmel_nfc {
        bool                    use_nfc_sram;
        bool                    write_by_sram;
 
+       struct clk              *clk;
+
        bool                    is_initialized;
        struct completion       comp_ready;
        struct completion       comp_cmd_done;
@@ -2248,6 +2251,7 @@ static int atmel_nand_nfc_probe(struct platform_device 
*pdev)
 {
        struct atmel_nfc *nfc = &nand_nfc;
        struct resource *nfc_cmd_regs, *nfc_hsmc_regs, *nfc_sram;
+       int ret;
 
        nfc_cmd_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        nfc->base_cmd_regs = devm_ioremap_resource(&pdev->dev, nfc_cmd_regs);
@@ -2276,6 +2280,16 @@ static int atmel_nand_nfc_probe(struct platform_device 
*pdev)
                }
        }
 
+       nfc->clk = devm_clk_get(&pdev->dev, NULL);
+       if (IS_ERR(nfc->clk)) {
+               dev_warn(&pdev->dev, "NFC clock is missing");
+               return 0;
+       }
+
+       ret = clk_prepare_enable(nfc->clk);
+       if (ret)
+               return ret;
+
        nfc_writel(nfc->hsmc_regs, IDR, 0xffffffff);
        nfc_readl(nfc->hsmc_regs, SR);  /* clear the NFC_SR */
 
@@ -2284,6 +2298,16 @@ static int atmel_nand_nfc_probe(struct platform_device 
*pdev)
        return 0;
 }
 
+static int atmel_nand_nfc_remove(struct platform_device *pdev)
+{
+       struct atmel_nfc *nfc = &nand_nfc;
+
+       if (!IS_ERR(nfc->clk))
+               clk_disable_unprepare(nfc->clk);
+
+       return 0;
+}
+
 static const struct of_device_id atmel_nand_nfc_match[] = {
        { .compatible = "atmel,sama5d3-nfc" },
        { /* sentinel */ }
@@ -2297,6 +2321,7 @@ static struct platform_driver atmel_nand_nfc_driver = {
                .of_match_table = of_match_ptr(atmel_nand_nfc_match),
        },
        .probe = atmel_nand_nfc_probe,
+       .remove = atmel_nand_nfc_remove,
 };
 
 static struct platform_driver atmel_nand_driver = {
-- 
1.9.1

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