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

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Message-ID: <20250328085607.GE22295@pendragon.ideasonboard.com>
Date: Fri, 28 Mar 2025 10:56:07 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Daniel Baluta <daniel.baluta@...il.com>
Cc: Frank Li <Frank.Li@....com>, 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>,
	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 Fri, Mar 28, 2025 at 10:35:44AM +0200, Daniel Baluta wrote:
> 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 personally find that clear section markers make the code easier to
read. It's a personal preference though, so I leave it to individual
driver maintainers, and aim for consistency within drivers.

> > + * i.MX8MQ GPR
> > + */
> 
> Just say: /* i.MX8MQ GPR */
> 
> This pattern happens in a lot of places.

-- 
Regards,

Laurent Pinchart