linux-kernel - Re: [PATCH v3 07/12] media: imx8mq-mipi-csi2: Add imx8mq_plat

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Message-ID: <CAEnQRZAmCrZ=OmMLWF80mrMih+uFDKMp3dGsEosJe0vCHgEEYw@mail.gmail.com>
Date: Fri, 28 Mar 2025 10:35:44 +0200
From: Daniel Baluta <daniel.baluta@...il.com>
To: Frank Li <Frank.Li@....com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Dong Aisheng <aisheng.dong@....com>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Shawn Guo <shawnguo@...nel.org>, 
	Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>, 
	Fabio Estevam <festevam@...il.com>, Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, Rui Miguel Silva <rmfrfs@...il.com>, 
	Martin Kepplinger <martink@...teo.de>, Purism Kernel Team <kernel@...i.sm>, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org, 
	Robert Chiras <robert.chiras@....com>, "Guoniu.zhou" <guoniu.zhou@....com>
Subject: Re: [PATCH v3 07/12] media: imx8mq-mipi-csi2: Add imx8mq_plat_data
 for different compatible strings

On Mon, Feb 10, 2025 at 11:02 PM Frank Li <Frank.Li@....com> wrote:
>
> From: "Guoniu.zhou" <guoniu.zhou@....com>
>
> Introduce `imx8mq_plat_data` along with enable/disable callback operations
> to facilitate support for new chips. No functional changes.
>
> Signed-off-by: Guoniu.zhou <guoniu.zhou@....com>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> Change from v2 to v3
> - none
> change from v1 to v2
> - remove internal review tags
> ---
>  drivers/media/platform/nxp/imx8mq-mipi-csi2.c | 60 ++++++++++++++++++++-------
>  1 file changed, 46 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> index 1f2657cf6e824..b5eae56d92f49 100644
> --- a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> +++ b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> @@ -62,6 +62,8 @@
>  #define CSI2RX_CFG_VID_P_FIFO_SEND_LEVEL       0x188
>  #define CSI2RX_CFG_DISABLE_PAYLOAD_1           0x130
>
> +struct csi_state;
> +
>  enum {
>         ST_POWERED      = 1,
>         ST_STREAMING    = 2,
> @@ -83,11 +85,11 @@ static const char * const imx8mq_mipi_csi_clk_id[CSI2_NUM_CLKS] = {
>
>  #define CSI2_NUM_CLKS  ARRAY_SIZE(imx8mq_mipi_csi_clk_id)
>
> -#define        GPR_CSI2_1_RX_ENABLE            BIT(13)
> -#define        GPR_CSI2_1_VID_INTFC_ENB        BIT(12)
> -#define        GPR_CSI2_1_HSEL                 BIT(10)
> -#define        GPR_CSI2_1_CONT_CLK_MODE        BIT(8)
> -#define        GPR_CSI2_1_S_PRG_RXHS_SETTLE(x) (((x) & 0x3f) << 2)
> +struct imx8mq_plat_data {
> +       const char *name;
> +       int (*enable)(struct csi_state *state, u32 hs_settle);
> +       void (*disable)(struct csi_state *state);
> +};
>
>  /*
>   * The send level configures the number of entries that must accumulate in
> @@ -106,6 +108,7 @@ static const char * const imx8mq_mipi_csi_clk_id[CSI2_NUM_CLKS] = {
>
>  struct csi_state {
>         struct device *dev;
> +       const struct imx8mq_plat_data *pdata;
>         void __iomem *regs;
>         struct clk_bulk_data clks[CSI2_NUM_CLKS];
>         struct reset_control *rst;
> @@ -137,6 +140,35 @@ struct csi2_pix_format {
>         u8 width;
>  };
>
> +/* -----------------------------------------------------------------------------

I would drop this line. It doesn't make code easier to read.
> + * i.MX8MQ GPR
> + */

Just say: /* i.MX8MQ GPR */

This pattern happens in a lot of places.