linux-kernel - Re: [PATCH 3/5] media: imx8mq-mipi-csi2: Use devm_clk_bulk_get

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Message-ID: <aJtsearbkc52vzAV@lizhi-Precision-Tower-5810>
Date: Tue, 12 Aug 2025 12:31:53 -0400
From: Frank Li <Frank.li@....com>
To: guoniu.zhou@....nxp.com
Cc: linux-media@...r.kernel.org, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, rmfrfs@...il.com,
	laurent.pinchart@...asonboard.com, martink@...teo.de,
	kernel@...i.sm, mchehab@...nel.org, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, shawnguo@...nel.org,
	s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com
Subject: Re: [PATCH 3/5] media: imx8mq-mipi-csi2: Use devm_clk_bulk_get_all()
 to fetch clocks

On Tue, Aug 12, 2025 at 04:19:24PM +0800, guoniu.zhou@....nxp.com wrote:
> From: Guoniu Zhou <guoniu.zhou@....com>
>
> Use devm_clk_bulk_get_all() helper to simplify clock handle code.
>
> No functional changes intended.
>
> Signed-off-by: Guoniu Zhou <guoniu.zhou@....com>

Reviewed-by: Frank Li <Frank.Li@....com>

> ---
>  drivers/media/platform/nxp/imx8mq-mipi-csi2.c | 52 ++++++-------------
>  1 file changed, 15 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> index ed6578f7f0f9..be07ff27071f 100644
> --- a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> +++ b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> @@ -72,21 +72,6 @@ enum {
>  	ST_SUSPENDED	= 4,
>  };
>
> -enum imx8mq_mipi_csi_clk {
> -	CSI2_CLK_CORE,
> -	CSI2_CLK_ESC,
> -	CSI2_CLK_UI,
> -	CSI2_NUM_CLKS,
> -};
> -
> -static const char * const imx8mq_mipi_csi_clk_id[CSI2_NUM_CLKS] = {
> -	[CSI2_CLK_CORE] = "core",
> -	[CSI2_CLK_ESC] = "esc",
> -	[CSI2_CLK_UI] = "ui",
> -};
> -
> -#define CSI2_NUM_CLKS	ARRAY_SIZE(imx8mq_mipi_csi_clk_id)
> -
>  struct imx8mq_plat_data {
>  	int (*enable)(struct csi_state *state, u32 hs_settle);
>  	void (*disable)(struct csi_state *state);
> @@ -112,7 +97,8 @@ struct csi_state {
>  	struct device *dev;
>  	const struct imx8mq_plat_data *pdata;
>  	void __iomem *regs;
> -	struct clk_bulk_data clks[CSI2_NUM_CLKS];
> +	struct clk_bulk_data *clks;
> +	int num_clks;
>  	struct reset_control *rst;
>  	struct regulator *mipi_phy_regulator;
>
> @@ -417,24 +403,16 @@ static void imx8mq_mipi_csi_set_params(struct csi_state *state)
>  			      CSI2RX_SEND_LEVEL);
>  }
>
> -static int imx8mq_mipi_csi_clk_enable(struct csi_state *state)
> -{
> -	return clk_bulk_prepare_enable(CSI2_NUM_CLKS, state->clks);
> -}
> -
> -static void imx8mq_mipi_csi_clk_disable(struct csi_state *state)
> +static struct clk *find_esc_clk(struct csi_state *state)
>  {
> -	clk_bulk_disable_unprepare(CSI2_NUM_CLKS, state->clks);
> -}
> -
> -static int imx8mq_mipi_csi_clk_get(struct csi_state *state)
> -{
> -	unsigned int i;
> +	int i;
>
> -	for (i = 0; i < CSI2_NUM_CLKS; i++)
> -		state->clks[i].id = imx8mq_mipi_csi_clk_id[i];
> +	for (i = 0; i < state->num_clks; i++) {
> +		if (!strcmp(state->clks[i].id, "esc"))
> +			return state->clks[i].clk;
> +	}
>
> -	return devm_clk_bulk_get(state->dev, CSI2_NUM_CLKS, state->clks);
> +	return NULL;
>  }
>
>  static int imx8mq_mipi_csi_calc_hs_settle(struct csi_state *state,
> @@ -489,7 +467,7 @@ static int imx8mq_mipi_csi_calc_hs_settle(struct csi_state *state,
>  	 * documentation recommends picking a value away from the boundaries.
>  	 * Let's pick the average.
>  	 */
> -	esc_clk_rate = clk_get_rate(state->clks[CSI2_CLK_ESC].clk);
> +	esc_clk_rate = clk_get_rate(find_esc_clk(state));
>  	if (!esc_clk_rate) {
>  		dev_err(state->dev, "Could not get esc clock rate.\n");
>  		return -EINVAL;
> @@ -848,7 +826,7 @@ static void imx8mq_mipi_csi_pm_suspend(struct device *dev)
>
>  	if (state->state & ST_POWERED) {
>  		imx8mq_mipi_csi_stop_stream(state);
> -		imx8mq_mipi_csi_clk_disable(state);
> +		clk_bulk_disable_unprepare(state->num_clks, state->clks);
>  		state->state &= ~ST_POWERED;
>  	}
>
> @@ -866,7 +844,7 @@ static int imx8mq_mipi_csi_pm_resume(struct device *dev)
>
>  	if (!(state->state & ST_POWERED)) {
>  		state->state |= ST_POWERED;
> -		ret = imx8mq_mipi_csi_clk_enable(state);
> +		ret = clk_bulk_prepare_enable(state->num_clks, state->clks);
>  	}
>  	if (state->state & ST_STREAMING) {
>  		sd_state = v4l2_subdev_lock_and_get_active_state(sd);
> @@ -1092,9 +1070,9 @@ static int imx8mq_mipi_csi_probe(struct platform_device *pdev)
>  	if (IS_ERR(state->regs))
>  		return PTR_ERR(state->regs);
>
> -	ret = imx8mq_mipi_csi_clk_get(state);
> -	if (ret < 0)
> -		return ret;
> +	state->num_clks = devm_clk_bulk_get_all(dev, &state->clks);
> +	if (state->num_clks < 0)
> +		return dev_err_probe(dev, state->num_clks, "Failed to get clocks\n");
>
>  	platform_set_drvdata(pdev, &state->sd);
>
> --
> 2.34.1
>