On 09/24/13 08:50, Jürgen Beisert wrote:
> Hi Fabio,
>
> On Monday 23 September 2013 17:13:03 Fabio Estevam wrote:
>> On 09/23/2013 11:36 AM, Juergen Beisert wrote:
>>> + lradc->clk = devm_clk_get(&pdev->dev, NULL);
>>> + clk_prepare_enable(lradc->clk);
>>
>> clk_prepare_enable() may fail, so better check its return value.
>
> Thanks for the comment. Better this way?
>
> commit 825c5bb787a0dc9d25d480178e117be08810639c
> Author: Juergen Beisert <jbe@xxxxxxxxxxxxxx>
> Date: Mon Sep 23 16:10:56 2013 +0200
Applied. If you are going to have a new patch version in the middle of the thread
please generate it with git format-patch and then send it as a reply to the email
you are responding to. Applying a patch like this is no where near as easy.
Applied to the togreg branch of iio.git
Thanks
>
> Staging/iio/adc/touchscreen/MXS: add proper clock handling
>
> The delay units inside the LRADC depend on the presence of a 2 kHz clock.
> This change enables the clock to be able to use the delay unit for the
> touchscreen part of the driver.
>
> Signed-off-by: Juergen Beisert <jbe@xxxxxxxxxxxxxx>
>
> diff --git a/arch/arm/boot/dts/imx23.dtsi b/arch/arm/boot/dts/imx23.dtsi
> index 28b5ce2..07caf76 100644
> --- a/arch/arm/boot/dts/imx23.dtsi
> +++ b/arch/arm/boot/dts/imx23.dtsi
> @@ -430,6 +430,7 @@
> reg = <0x80050000 0x2000>;
> interrupts = <36 37 38 39 40 41 42 43 44>;
> status = "disabled";
> + clocks = <&clks 26>;
> };
>
> spdif@80054000 {
> diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi
> index 7363fde..175deef 100644
> --- a/arch/arm/boot/dts/imx28.dtsi
> +++ b/arch/arm/boot/dts/imx28.dtsi
> @@ -902,6 +902,7 @@
> interrupts = <10 14 15 16 17 18 19
> 20 21 22 23 24 25>;
> status = "disabled";
> + clocks = <&clks 41>;
> };
>
> spdif: spdif@80054000 {
> diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
> index a08c173..eaca1ae 100644
> --- a/drivers/staging/iio/adc/mxs-lradc.c
> +++ b/drivers/staging/iio/adc/mxs-lradc.c
> @@ -35,6 +35,7 @@
> #include <linux/completion.h>
> #include <linux/delay.h>
> #include <linux/input.h>
> +#include <linux/clk.h>
>
> #include <linux/iio/iio.h>
> #include <linux/iio/buffer.h>
> @@ -134,6 +135,8 @@ struct mxs_lradc {
> void __iomem *base;
> int irq[13];
>
> + struct clk *clk;
> +
> uint32_t *buffer;
> struct iio_trigger *trig;
>
> @@ -928,6 +931,17 @@ static int mxs_lradc_probe(struct platform_device *pdev)
> if (IS_ERR(lradc->base))
> return PTR_ERR(lradc->base);
>
> + lradc->clk = devm_clk_get(&pdev->dev, NULL);
> + if (IS_ERR(lradc->clk)) {
> + dev_err(dev, "Failed to get the delay unit clock\n");
> + return PTR_ERR(lradc->clk);
> + }
> + ret = clk_prepare_enable(lradc->clk);
> + if (ret != 0) {
> + dev_err(dev, "Failed to enable the delay unit clock\n");
> + return ret;
> + }
> +
> INIT_WORK(&lradc->ts_work, mxs_lradc_ts_work);
>
> /* Check if touchscreen is enabled in DT. */
> @@ -1020,6 +1034,7 @@ static int mxs_lradc_remove(struct platform_device *pdev)
> iio_triggered_buffer_cleanup(iio);
> mxs_lradc_trigger_remove(iio);
>
> + clk_disable_unprepare(lradc->clk);
> return 0;
> }
>
> Juergen
>
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