diff options
| author | Andrew Lunn <andrew@lunn.ch> | 2012-02-19 11:01:22 +0100 |
|---|---|---|
| committer | Mike Turquette <mturquette@linaro.org> | 2012-05-08 16:33:59 -0700 |
| commit | 9c2bd504b55ce3e680ae0d3768e78c15fef3448d (patch) | |
| tree | 01ca9fcb81c8d0bdf6680ceeb071f0120ad89c44 /drivers/mtd/nand/orion_nand.c | |
| parent | 8c869edaee07c623066266827371235fb9c12e01 (diff) | |
ARM: Orion: NAND: Add support for clk, if there is one.
Not all orion platforms can gate the clock, but if it does exist,
enable/disable it as appropriate.
v2: Fix the name of the clkdev entry.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Jamie Lentin <jm@lentin.co.uk>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers/mtd/nand/orion_nand.c')
| -rw-r--r-- | drivers/mtd/nand/orion_nand.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/mtd/nand/orion_nand.c b/drivers/mtd/nand/orion_nand.c index 1d3bfb26080c..fdc4786ea3e5 100644 --- a/drivers/mtd/nand/orion_nand.c +++ b/drivers/mtd/nand/orion_nand.c @@ -16,6 +16,8 @@ #include <linux/mtd/mtd.h> #include <linux/mtd/nand.h> #include <linux/mtd/partitions.h> +#include <linux/clk.h> +#include <linux/err.h> #include <asm/io.h> #include <asm/sizes.h> #include <mach/hardware.h> @@ -77,6 +79,7 @@ static int __init orion_nand_probe(struct platform_device *pdev) struct nand_chip *nc; struct orion_nand_data *board; struct resource *res; + struct clk *clk; void __iomem *io_base; int ret = 0; @@ -123,6 +126,14 @@ static int __init orion_nand_probe(struct platform_device *pdev) platform_set_drvdata(pdev, mtd); + /* Not all platforms can gate the clock, so it is not + an error if the clock does not exists. */ + clk = clk_get(&pdev->dev, NULL); + if (!IS_ERR(clk)) { + clk_prepare_enable(clk); + clk_put(clk); + } + if (nand_scan(mtd, 1)) { ret = -ENXIO; goto no_dev; @@ -151,6 +162,7 @@ static int __devexit orion_nand_remove(struct platform_device *pdev) { struct mtd_info *mtd = platform_get_drvdata(pdev); struct nand_chip *nc = mtd->priv; + struct clk *clk; nand_release(mtd); @@ -158,6 +170,12 @@ static int __devexit orion_nand_remove(struct platform_device *pdev) kfree(nc); + clk = clk_get(&pdev->dev, NULL); + if (!IS_ERR(clk)) { + clk_disable_unprepare(clk); + clk_put(clk); + } + return 0; } |