diff options
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/adc/stm32-adc.c | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c index 50b253806827..2ba9ca991f0a 100644 --- a/drivers/iio/adc/stm32-adc.c +++ b/drivers/iio/adc/stm32-adc.c @@ -160,6 +160,7 @@ struct stm32_adc; * @regs: registers descriptions * @adc_info: per instance input channels definitions * @trigs: external trigger sources + * @clk_required: clock is required * @start_conv: routine to start conversions * @stop_conv: routine to stop conversions */ @@ -167,6 +168,7 @@ struct stm32_adc_cfg { const struct stm32_adc_regspec *regs; const struct stm32_adc_info *adc_info; struct stm32_adc_trig_info *trigs; + bool clk_required; void (*start_conv)(struct stm32_adc *, bool dma); void (*stop_conv)(struct stm32_adc *); }; @@ -1145,14 +1147,21 @@ static int stm32_adc_probe(struct platform_device *pdev) adc->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(adc->clk)) { - dev_err(&pdev->dev, "Can't get clock\n"); - return PTR_ERR(adc->clk); + ret = PTR_ERR(adc->clk); + if (ret == -ENOENT && !adc->cfg->clk_required) { + adc->clk = NULL; + } else { + dev_err(&pdev->dev, "Can't get clock\n"); + return ret; + } } - ret = clk_prepare_enable(adc->clk); - if (ret < 0) { - dev_err(&pdev->dev, "clk enable failed\n"); - return ret; + if (adc->clk) { + ret = clk_prepare_enable(adc->clk); + if (ret < 0) { + dev_err(&pdev->dev, "clk enable failed\n"); + return ret; + } } ret = stm32_adc_of_get_resolution(indio_dev); @@ -1196,7 +1205,8 @@ err_dma_disable: dma_release_channel(adc->dma_chan); } err_clk_disable: - clk_disable_unprepare(adc->clk); + if (adc->clk) + clk_disable_unprepare(adc->clk); return ret; } @@ -1214,7 +1224,8 @@ static int stm32_adc_remove(struct platform_device *pdev) adc->rx_buf, adc->rx_dma_buf); dma_release_channel(adc->dma_chan); } - clk_disable_unprepare(adc->clk); + if (adc->clk) + clk_disable_unprepare(adc->clk); return 0; } @@ -1223,6 +1234,7 @@ static const struct stm32_adc_cfg stm32f4_adc_cfg = { .regs = &stm32f4_adc_regspec, .adc_info = &stm32f4_adc_info, .trigs = stm32f4_adc_trigs, + .clk_required = true, .start_conv = stm32f4_adc_start_conv, .stop_conv = stm32f4_adc_stop_conv, }; |