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SubjectRe: [PATCH v10 22/28] media: platform: Change the call functions of getting/enable/disable the jpeg's clock
Hi Xia,

On Thu, Jul 23, 2020 at 11:04:45AM +0800, Xia Jiang wrote:
> Use the generic of_property_* helpers to get the clock_nums and clocks
> from device tree.
> Use the generic clk_bulk_* helpers to enable and disable clocks.
>
> Signed-off-by: Xia Jiang <xia.jiang@mediatek.com>
> ---
> v10: new add patch
> ---
> .../media/platform/mtk-jpeg/mtk_jpeg_core.c | 47 +++++++++++++++----
> .../media/platform/mtk-jpeg/mtk_jpeg_core.h | 8 ++--
> 2 files changed, 42 insertions(+), 13 deletions(-)
>

Thank you for the patch. Please see my comments inline.

> diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
> index 7881e9c93df7..921ed21f7db3 100644
> --- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
> +++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
> @@ -783,14 +783,15 @@ static void mtk_jpeg_clk_on(struct mtk_jpeg_dev *jpeg)
> ret = mtk_smi_larb_get(jpeg->larb);
> if (ret)
> dev_err(jpeg->dev, "mtk_smi_larb_get larbvdec fail %d\n", ret);
> - clk_prepare_enable(jpeg->clk_jdec_smi);
> - clk_prepare_enable(jpeg->clk_jdec);
> +
> + ret = clk_bulk_prepare_enable(jpeg->num_clks, jpeg->clks);
> + if (ret)
> + dev_err(jpeg->dev, "Failed to open jpeg clk: %d\n", ret);
> }
>
> static void mtk_jpeg_clk_off(struct mtk_jpeg_dev *jpeg)
> {
> - clk_disable_unprepare(jpeg->clk_jdec);
> - clk_disable_unprepare(jpeg->clk_jdec_smi);
> + clk_bulk_disable_unprepare(jpeg->num_clks, jpeg->clks);
> mtk_smi_larb_put(jpeg->larb);
> }
>
> @@ -939,6 +940,7 @@ static int mtk_jpeg_clk_init(struct mtk_jpeg_dev *jpeg)
> {
> struct device_node *node;
> struct platform_device *pdev;
> + int ret, i;
>
> node = of_parse_phandle(jpeg->dev->of_node, "mediatek,larb", 0);
> if (!node)
> @@ -952,12 +954,39 @@ static int mtk_jpeg_clk_init(struct mtk_jpeg_dev *jpeg)
>
> jpeg->larb = &pdev->dev;
>
> - jpeg->clk_jdec = devm_clk_get(jpeg->dev, "jpgdec");
> - if (IS_ERR(jpeg->clk_jdec))
> - return PTR_ERR(jpeg->clk_jdec);
> + jpeg->num_clks =
> + of_property_count_strings(jpeg->dev->of_node, "clock-names");
> +
> + if (jpeg->num_clks > 0) {
> + jpeg->clks = devm_kcalloc(jpeg->dev, jpeg->num_clks,
> + sizeof(struct clk_bulk_data),
> + GFP_KERNEL);
> + if (!jpeg->clks)
> + return -ENOMEM;
> + } else {
> + dev_err(&pdev->dev, "Failed to get jpeg clock count\n");
> + return -EINVAL;
> + }
> +
> + for (i = 0; i < jpeg->num_clks; i++) {
> + ret = of_property_read_string_index(jpeg->dev->of_node,
> + "clock-names", i,
> + &jpeg->clks->id);

The names of the clocks must be explicitly specified in the driver, as per
the DT bindings.

Best regards,
Tomasz

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