Messages in this thread Patch in this message | | | From | Richard Zhao <> | Subject | [PATCH 2/2] mfd: anatop: permit adata be NULL when access register | Date | Sun, 13 May 2012 08:59:54 +0800 |
| |
It makes anatop register access easier. Anatop has many misc registers, which may not be a specific driver.
There's only one anatop device for a running system, so we use a global variable to store struct anatop.
Signed-off-by: Richard Zhao <richard.zhao@freescale.com> --- drivers/mfd/anatop-mfd.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/mfd/anatop-mfd.c b/drivers/mfd/anatop-mfd.c index 3bb7c49..b0313210 100644 --- a/drivers/mfd/anatop-mfd.c +++ b/drivers/mfd/anatop-mfd.c @@ -41,8 +41,15 @@ #include <linux/of_address.h> #include <linux/mfd/anatop.h> +/* For any running system, there's only one anatop device. */ +static struct anatop *anatop_data; + u32 anatop_read_reg(struct anatop *adata, u32 addr) { + BUG_ON(!anatop_data); + if (!adata) + adata = anatop_data; + return readl(adata->ioreg + addr); } EXPORT_SYMBOL_GPL(anatop_read_reg); @@ -51,6 +58,10 @@ void anatop_write_reg(struct anatop *adata, u32 addr, u32 data, u32 mask) { u32 val; + BUG_ON(!anatop_data); + if (!adata) + adata = anatop_data; + data &= mask; spin_lock(&adata->reglock); @@ -83,6 +94,7 @@ static int __devinit of_anatop_probe(struct platform_device *pdev) drvdata->ioreg = ioreg; spin_lock_init(&drvdata->reglock); platform_set_drvdata(pdev, drvdata); + anatop_data = drvdata; of_platform_populate(np, of_anatop_match, NULL, dev); return 0; -- 1.7.9.5
| |