From f389e89c35fbfe17ffcb94378c225c933c28bdb2 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Fri, 22 Nov 2013 23:06:54 -0300 Subject: [PATCH] [media] v4l: atmel-isi: Make the MCK clock optional ISI_MCK is the sensor master clock. It should be handled by the sensor driver directly, as the ISI has no use for that clock. Make the clock optional here while platforms transition to the correct model. Signed-off-by: Laurent Pinchart Acked-by: Josh Wu Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/soc_camera/atmel-isi.c | 36 +++++++++++-------- 1 file changed, 21 insertions(+), 15 deletions(-) diff --git a/drivers/media/platform/soc_camera/atmel-isi.c b/drivers/media/platform/soc_camera/atmel-isi.c index ae2c8c1f3c46..3e8d4129b0ba 100644 --- a/drivers/media/platform/soc_camera/atmel-isi.c +++ b/drivers/media/platform/soc_camera/atmel-isi.c @@ -725,10 +725,12 @@ static int isi_camera_clock_start(struct soc_camera_host *ici) if (ret) return ret; - ret = clk_prepare_enable(isi->mck); - if (ret) { - clk_disable_unprepare(isi->pclk); - return ret; + if (!IS_ERR(isi->mck)) { + ret = clk_prepare_enable(isi->mck); + if (ret) { + clk_disable_unprepare(isi->pclk); + return ret; + } } return 0; @@ -739,7 +741,8 @@ static void isi_camera_clock_stop(struct soc_camera_host *ici) { struct atmel_isi *isi = ici->priv; - clk_disable_unprepare(isi->mck); + if (!IS_ERR(isi->mck)) + clk_disable_unprepare(isi->mck); clk_disable_unprepare(isi->pclk); } @@ -883,7 +886,7 @@ static int atmel_isi_probe(struct platform_device *pdev) struct isi_platform_data *pdata; pdata = dev->platform_data; - if (!pdata || !pdata->data_width_flags || !pdata->mck_hz) { + if (!pdata || !pdata->data_width_flags) { dev_err(&pdev->dev, "No config available for Atmel ISI\n"); return -EINVAL; @@ -905,18 +908,21 @@ static int atmel_isi_probe(struct platform_device *pdev) INIT_LIST_HEAD(&isi->video_buffer_list); INIT_LIST_HEAD(&isi->dma_desc_head); - /* Get ISI_MCK, provided by programmable clock or external clock */ + /* ISI_MCK is the sensor master clock. It should be handled by the + * sensor driver directly, as the ISI has no use for that clock. Make + * the clock optional here while platforms transition to the correct + * model. + */ isi->mck = devm_clk_get(dev, "isi_mck"); - if (IS_ERR(isi->mck)) { - dev_err(dev, "Failed to get isi_mck\n"); - return PTR_ERR(isi->mck); + if (!IS_ERR(isi->mck)) { + /* Set ISI_MCK's frequency, it should be faster than pixel + * clock. + */ + ret = clk_set_rate(isi->mck, pdata->mck_hz); + if (ret < 0) + return ret; } - /* Set ISI_MCK's frequency, it should be faster than pixel clock */ - ret = clk_set_rate(isi->mck, pdata->mck_hz); - if (ret < 0) - return ret; - isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev, sizeof(struct fbd) * MAX_BUFFER_NUM, &isi->fb_descriptors_phys, -- 2.34.1