[PATCH] i2c: imx: convert to use managed functions
Richard Zhao
richard.zhao at freescale.com
Sun May 13 23:09:25 EDT 2012
On Mon, May 14, 2012 at 11:05:03AM +0800, Shawn Guo wrote:
> On Sat, May 12, 2012 at 09:02:23PM +0800, Richard Zhao wrote:
> > Signed-off-by: Richard Zhao <richard.zhao at freescale.com>
> > ---
> > drivers/i2c/busses/i2c-imx.c | 59 ++++++++++--------------------------------
> > 1 file changed, 14 insertions(+), 45 deletions(-)
> >
> Nice cleanup.
>
> > diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
> > index 56bce9a..927da64 100644
> > --- a/drivers/i2c/busses/i2c-imx.c
> > +++ b/drivers/i2c/busses/i2c-imx.c
> > @@ -118,7 +118,6 @@ static u16 __initdata i2c_clk_div[50][2] = {
> >
> > struct imx_i2c_struct {
> > struct i2c_adapter adapter;
> > - struct resource *res;
> > struct clk *clk;
> > void __iomem *base;
> > int irq;
>
> Is it being used elsewhere except i2c_imx_probe()? If not, we can
> remove it from the struct?
Nice catch.
>
> > @@ -473,7 +472,6 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
> > struct imxi2c_platform_data *pdata = pdev->dev.platform_data;
> > struct pinctrl *pinctrl;
> > void __iomem *base;
> > - resource_size_t res_size;
> > int irq, bitrate;
> > int ret;
> >
> > @@ -490,25 +488,16 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
> > return -ENOENT;
> > }
> >
> > - res_size = resource_size(res);
> > -
> > - if (!request_mem_region(res->start, res_size, DRIVER_NAME)) {
> > - dev_err(&pdev->dev, "request_mem_region failed\n");
> > + base = devm_request_and_ioremap(&pdev->dev, res);
> > + if (!base)
> > return -EBUSY;
>
> Since we are moving to devm_request_and_ioremap, I'd recommend change
> the error code to what the function kerneldoc suggests, -EADDRNOTAVAIL.
Correct.
>
> > - }
> > -
> > - base = ioremap(res->start, res_size);
> > - if (!base) {
> > - dev_err(&pdev->dev, "ioremap failed\n");
> > - ret = -EIO;
> > - goto fail1;
> > - }
> >
> > - i2c_imx = kzalloc(sizeof(struct imx_i2c_struct), GFP_KERNEL);
> > + i2c_imx = devm_kzalloc(&pdev->dev, sizeof(struct imx_i2c_struct),
> > + GFP_KERNEL);
> > if (!i2c_imx) {
> > dev_err(&pdev->dev, "can't allocate interface\n");
> > ret = -ENOMEM;
> > - goto fail2;
> > + return ret;
> > }
> >
> > /* Setup i2c_imx driver structure */
> > @@ -520,27 +509,27 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
> > i2c_imx->adapter.dev.of_node = pdev->dev.of_node;
> > i2c_imx->irq = irq;
> > i2c_imx->base = base;
> > - i2c_imx->res = res;
> >
> > pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
> > if (IS_ERR(pinctrl)) {
> > ret = PTR_ERR(pinctrl);
> > - goto fail3;
> > + return ret;
> > }
> >
> > /* Get I2C clock */
> > - i2c_imx->clk = clk_get(&pdev->dev, "i2c_clk");
> > + i2c_imx->clk = devm_clk_get(&pdev->dev, "i2c_clk");
> > if (IS_ERR(i2c_imx->clk)) {
> > ret = PTR_ERR(i2c_imx->clk);
> > dev_err(&pdev->dev, "can't get I2C clock\n");
> > - goto fail3;
> > + return ret;
> > }
>
> Ok, you are basing the patch on two APIs,
> devm_pinctrl_get_select_default and devm_clk_get, that have not hit
> mainline, so it looks like a candidate for the next merge window.
hmm..., If it has to be, that's ok.
Thanks
Richard
>
> Regards,
> Shawn
>
> >
> > /* Request IRQ */
> > - ret = request_irq(i2c_imx->irq, i2c_imx_isr, 0, pdev->name, i2c_imx);
> > + ret = devm_request_irq(&pdev->dev, i2c_imx->irq, i2c_imx_isr, 0,
> > + pdev->name, i2c_imx);
> > if (ret) {
> > dev_err(&pdev->dev, "can't claim irq %d\n", i2c_imx->irq);
> > - goto fail4;
> > + return ret;
> > }
> >
> > /* Init queue */
> > @@ -565,7 +554,7 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
> > ret = i2c_add_numbered_adapter(&i2c_imx->adapter);
> > if (ret < 0) {
> > dev_err(&pdev->dev, "registration failed\n");
> > - goto fail5;
> > + return ret;
> > }
> >
> > of_i2c_register_devices(&i2c_imx->adapter);
> > @@ -575,26 +564,14 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
> >
> > dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", i2c_imx->irq);
> > dev_dbg(&i2c_imx->adapter.dev, "device resources from 0x%x to 0x%x\n",
> > - i2c_imx->res->start, i2c_imx->res->end);
> > + res->start, res->end);
> > dev_dbg(&i2c_imx->adapter.dev, "allocated %d bytes at 0x%x \n",
> > - res_size, i2c_imx->res->start);
> > + resource_size(res), res->start);
> > dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n",
> > i2c_imx->adapter.name);
> > dev_dbg(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
> >
> > return 0; /* Return OK */
> > -
> > -fail5:
> > - free_irq(i2c_imx->irq, i2c_imx);
> > -fail4:
> > - clk_put(i2c_imx->clk);
> > -fail3:
> > - kfree(i2c_imx);
> > -fail2:
> > - iounmap(base);
> > -fail1:
> > - release_mem_region(res->start, resource_size(res));
> > - return ret; /* Return error number */
> > }
> >
> > static int __exit i2c_imx_remove(struct platform_device *pdev)
> > @@ -606,20 +583,12 @@ static int __exit i2c_imx_remove(struct platform_device *pdev)
> > i2c_del_adapter(&i2c_imx->adapter);
> > platform_set_drvdata(pdev, NULL);
> >
> > - /* free interrupt */
> > - free_irq(i2c_imx->irq, i2c_imx);
> > -
> > /* setup chip registers to defaults */
> > writeb(0, i2c_imx->base + IMX_I2C_IADR);
> > writeb(0, i2c_imx->base + IMX_I2C_IFDR);
> > writeb(0, i2c_imx->base + IMX_I2C_I2CR);
> > writeb(0, i2c_imx->base + IMX_I2C_I2SR);
> >
> > - clk_put(i2c_imx->clk);
> > -
> > - iounmap(i2c_imx->base);
> > - release_mem_region(i2c_imx->res->start, resource_size(i2c_imx->res));
> > - kfree(i2c_imx);
> > return 0;
> > }
> >
> > --
> > 1.7.9.5
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel at lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> >
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