On Tue, Sep 21, 2010 at 07:37:16PM +0530, Rajendra Nayak wrote: > This patch converts the i2c driver to use PM runtime apis > > Signed-off-by: Rajendra Nayak <rnayak@xxxxxx> > Cc: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx> > Cc: Paul Walmsley <paul@xxxxxxxxx> > --- > drivers/i2c/busses/i2c-omap.c | 67 +++++++++++++---------------------------- > 1 files changed, 21 insertions(+), 46 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c > index 7674efb..126bde9 100644 > --- a/drivers/i2c/busses/i2c-omap.c > +++ b/drivers/i2c/busses/i2c-omap.c > @@ -39,6 +39,7 @@ > #include <linux/io.h> > #include <linux/slab.h> > #include <linux/i2c-omap.h> > +#include <linux/pm_runtime.h> > > /* I2C controller revisions */ > #define OMAP_I2C_REV_2 0x20 > @@ -175,8 +176,6 @@ struct omap_i2c_dev { > void __iomem *base; /* virtual */ > int irq; > int reg_shift; /* bit shift for I2C register addresses */ > - struct clk *iclk; /* Interface clock */ > - struct clk *fclk; /* Functional clock */ > struct completion cmd_complete; > struct resource *ioarea; > u32 latency; /* maximum mpu wkup latency */ > @@ -265,45 +264,18 @@ static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg) > (i2c_dev->regs[reg] << i2c_dev->reg_shift)); > } > > -static int __init omap_i2c_get_clocks(struct omap_i2c_dev *dev) > +static void omap_i2c_unidle(struct omap_i2c_dev *dev) > { > - int ret; > + struct platform_device *pdev; > + struct omap_i2c_bus_platform_data *pdata; > > - dev->iclk = clk_get(dev->dev, "ick"); > - if (IS_ERR(dev->iclk)) { > - ret = PTR_ERR(dev->iclk); > - dev->iclk = NULL; > - return ret; > - } > + WARN_ON(!dev->idle); > > - dev->fclk = clk_get(dev->dev, "fck"); > - if (IS_ERR(dev->fclk)) { > - ret = PTR_ERR(dev->fclk); > - if (dev->iclk != NULL) { > - clk_put(dev->iclk); > - dev->iclk = NULL; > - } > - dev->fclk = NULL; > - return ret; > - } > + pdev = to_platform_device(dev->dev); > + pdata = pdev->dev.platform_data; > > - return 0; > -} > + pm_runtime_get_sync(&pdev->dev); > > -static void omap_i2c_put_clocks(struct omap_i2c_dev *dev) > -{ > - clk_put(dev->fclk); > - dev->fclk = NULL; > - clk_put(dev->iclk); > - dev->iclk = NULL; > -} > - > -static void omap_i2c_unidle(struct omap_i2c_dev *dev) > -{ > - WARN_ON(!dev->idle); > - > - clk_enable(dev->iclk); > - clk_enable(dev->fclk); > if (cpu_is_omap34xx()) { > omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); > omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, dev->pscstate); > @@ -326,10 +298,15 @@ static void omap_i2c_unidle(struct omap_i2c_dev *dev) > > static void omap_i2c_idle(struct omap_i2c_dev *dev) > { > + struct platform_device *pdev; > + struct omap_i2c_bus_platform_data *pdata; > u16 iv; > > WARN_ON(dev->idle); > > + pdev = to_platform_device(dev->dev); > + pdata = pdev->dev.platform_data; > + > dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); > if (dev->rev >= OMAP_I2C_REV_ON_4430) > omap_i2c_write_reg(dev, OMAP_I2C_IRQENABLE_CLR, 1); > @@ -345,8 +322,8 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev) > omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); > } > dev->idle = 1; > - clk_disable(dev->fclk); > - clk_disable(dev->iclk); > + > + pm_runtime_put_sync(&pdev->dev); > } > > static int omap_i2c_init(struct omap_i2c_dev *dev) > @@ -356,6 +333,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) > unsigned long fclk_rate = 12000000; > unsigned long timeout; > unsigned long internal_clk = 0; > + struct clk *fclk; > > if (dev->rev >= OMAP_I2C_REV_2) { > /* Disable I2C controller before soft reset */ > @@ -414,7 +392,8 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) > * always returns 12MHz for the functional clock, we can > * do this bit unconditionally. > */ > - fclk_rate = clk_get_rate(dev->fclk); > + fclk = clk_get(dev->dev, "fck"); > + fclk_rate = clk_get_rate(fclk); > > /* TRM for 5912 says the I2C clock must be prescaled to be > * between 7 - 12 MHz. The XOR input clock is typically > @@ -443,7 +422,8 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) > internal_clk = 9600; > else > internal_clk = 4000; > - fclk_rate = clk_get_rate(dev->fclk) / 1000; > + fclk = clk_get(dev->dev, "fck"); > + fclk_rate = clk_get_rate(fclk) / 1000; You don't put the clk after getting it and using it once? > /* Compute prescaler divisor */ > psc = fclk_rate / internal_clk; > @@ -1046,14 +1026,12 @@ omap_i2c_probe(struct platform_device *pdev) > else > dev->reg_shift = 2; > > - if ((r = omap_i2c_get_clocks(dev)) != 0) > - goto err_iounmap; > - > if (cpu_is_omap44xx()) > dev->regs = (u8 *) omap4_reg_map; > else > dev->regs = (u8 *) reg_map; > > + pm_runtime_enable(&pdev->dev); > omap_i2c_unidle(dev); > > dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff; > @@ -1125,8 +1103,6 @@ err_free_irq: > err_unuse_clocks: > omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); > omap_i2c_idle(dev); > - omap_i2c_put_clocks(dev); > -err_iounmap: > iounmap(dev->base); > err_free_mem: > platform_set_drvdata(pdev, NULL); > @@ -1148,7 +1124,6 @@ omap_i2c_remove(struct platform_device *pdev) > free_irq(dev->irq, dev); > i2c_del_adapter(&dev->adapter); > omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); > - omap_i2c_put_clocks(dev); > iounmap(dev->base); > kfree(dev); > mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > -- > 1.5.4.7 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-i2c" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- -- Ben Q: What's a light-year? A: One-third less calories than a regular year. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html