From mboxrd@z Thu Jan 1 00:00:00 1970 From: richard.zhao@linaro.org (Richard Zhao) Date: Sun, 13 May 2012 08:59:54 +0800 Subject: [PATCH 2/2] mfd: anatop: permit adata be NULL when access register In-Reply-To: <1336870794-6351-1-git-send-email-richard.zhao@freescale.com> References: <1336870794-6351-1-git-send-email-richard.zhao@freescale.com> Message-ID: <1336870794-6351-2-git-send-email-richard.zhao@freescale.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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 #include +/* 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