linux-kernel - Re: [PATCH v5 18/24] media: i2c: maxim-serdes: add MAX96717 driver

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Message-ID: <026ab4ca4a237e84ce53bfa491bf27268b745fa8.camel@collabora.com>
Date: Thu, 03 Jul 2025 16:03:34 +0200
From: Julien Massot <julien.massot@...labora.com>
To: Cosmin Tanislav <demonsingur@...il.com>, Cosmin Tanislav	
 <cosmin.tanislav@...log.com>, Tomi Valkeinen	
 <tomi.valkeinen+renesas@...asonboard.com>, Mauro Carvalho Chehab	
 <mchehab@...nel.org>, Rob Herring <robh@...nel.org>, Niklas
 Söderlund	 <niklas.soderlund@...natech.se>, Sakari Ailus
 <sakari.ailus@...ux.intel.com>,  Laurent Pinchart
 <laurent.pinchart@...asonboard.com>, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>, Linus Walleij <linus.walleij@...aro.org>
Cc: linux-media@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-staging@...ts.linux.dev, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v5 18/24] media: i2c: maxim-serdes: add MAX96717 driver

On Thu, 2025-07-03 at 15:31 +0300, Cosmin Tanislav wrote:
> 
> 
> On 7/3/25 3:16 PM, Julien Massot wrote:
> > On Wed, 2025-07-02 at 16:20 +0300, Cosmin Tanislav wrote:
> > > Add a new MAX96717 driver that also supports MAX9295A, MAX96717F and
> > > MAX96793.
> > > 
> > > Integrate it with the common serializer framework, while keeping
> > > compatibility with existing usecases, avoiding code duplication, and
> > > also enabling more features across all chips.
> > > 
> > > Signed-off-by: Cosmin Tanislav <demonsingur@...il.com>
> > > ---
> > >   drivers/media/i2c/maxim-serdes/Kconfig    |   16 +
> > >   drivers/media/i2c/maxim-serdes/Makefile   |    1 +
> > >   drivers/media/i2c/maxim-serdes/max96717.c | 1685 +++++++++++++++++++++
> > >   3 files changed, 1702 insertions(+)
> > >   create mode 100644 drivers/media/i2c/maxim-serdes/max96717.c
> > > 
> > > diff --git a/drivers/media/i2c/maxim-serdes/Kconfig b/drivers/media/i2c/maxim-serdes/Kconfig
> > > index cae1d5a1293e..648cb891eefe 100644
> > > --- a/drivers/media/i2c/maxim-serdes/Kconfig
> > > +++ b/drivers/media/i2c/maxim-serdes/Kconfig
> > > @@ -14,3 +14,19 @@ config VIDEO_MAXIM_SERDES
> > >   
> > >   	  To compile this driver as a module, choose M here: the module
> > >   	  will be called max_serdes.
> > > +
> > > +config VIDEO_MAX96717
> > > +	tristate "Maxim MAX96717 Serializer support"
> > > +	depends on COMMON_CLK
> > > +	select VIDEO_MAXIM_SERDES
> > > +	select GENERIC_PINCONF
> > > +	select GENERIC_PINCTRL_GROUPS
> > > +	select GENERIC_PINMUX_FUNCTIONS
> > > +	select GPIOLIB
> > > +	help
> > > +	  This driver supports the Maxim MAX9295A, MAX96717, MAX96717F,
> > > +	  MAX96793 Serializers, which receive video on a MIPI CSI-2
> > > +	  interface and output it on a GMSL2/3 link.
> > > +
> > > +	  To compile this driver as a module, choose M here: the module
> > > +	  will be called max96717.
> > > diff --git a/drivers/media/i2c/maxim-serdes/Makefile b/drivers/media/i2c/maxim-serdes/Makefile
> > > index b54326a5c81b..04abda6a5437 100644
> > > --- a/drivers/media/i2c/maxim-serdes/Makefile
> > > +++ b/drivers/media/i2c/maxim-serdes/Makefile
> > > @@ -1,3 +1,4 @@
> > >   # SPDX-License-Identifier: GPL-2.0
> > >   max-serdes-objs := max_serdes.o max_ser.o max_des.o
> > >   obj-$(CONFIG_VIDEO_MAXIM_SERDES) += max-serdes.o
> > > +obj-$(CONFIG_VIDEO_MAX96717) += max96717.o
> > > diff --git a/drivers/media/i2c/maxim-serdes/max96717.c b/drivers/media/i2c/maxim-
> > > serdes/max96717.c
> > > new file mode 100644
> > > index 000000000000..60b285e547b7
> > > --- /dev/null
> > > +++ b/drivers/media/i2c/maxim-serdes/max96717.c
> > > @@ -0,0 +1,1685 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * Maxim MAX96717 GMSL2 Serializer Driver
> > > + *
> > > + * Copyright (C) 2025 Analog Devices Inc.
> > > + */
> > > +
> > > +#include <linux/clk.h>
> > > +#include <linux/clk-provider.h>
> > > +#include <linux/gpio/driver.h>
> > > +#include <linux/pinctrl/pinctrl.h>
> > > +#include <linux/pinctrl/pinmux.h>
> > > +#include <linux/pinctrl/pinconf.h>
> > > +#include <linux/pinctrl/pinconf-generic.h>
> > > +#include <linux/regmap.h>
> > > +
> > > +#include "max_ser.h"
> > > +
> > > +#define MAX96717_REG0				0x0
> > > +
> > > +#define MAX96717_REG2				0x2
> > > +#define MAX96717_REG2_VID_TX_EN_P(p)		BIT(4 + (p))
> > > +
> > > +#define MAX96717_REG3				0x3
> > > +#define MAX96717_REG3_RCLKSEL			GENMASK(1, 0)
> > > +#define MAX96717_REG3_RCLK_ALT			BIT(2)
> > > +
> > > +#define MAX96717_REG6				0x6
> > > +#define MAX96717_REG6_RCLKEN			BIT(5)
> > > +
> > > +#define MAX96717_I2C_2(x)			(0x42 + (x) * 0x2)
> > > +#define MAX96717_I2C_2_SRC			GENMASK(7, 1)
> > > +
> > > +#define MAX96717_I2C_3(x)			(0x43 + (x) * 0x2)
> > > +#define MAX96717_I2C_3_DST			GENMASK(7, 1)
> > > +
> > > +#define MAX96717_TX3(p)				(0x53 + (p) * 0x4)
> > > +#define MAX96717_TX3_TX_STR_SEL			GENMASK(1, 0)
> > > +
> > > +#define MAX96717_VIDEO_TX0(p)			(0x100 + (p) * 0x8)
> > This is a bit confusing, looks like this register address is valid for MAX9295a VIDEO_TX0
> > but not for MAX96717, VIDEO_TX0 (Z) is at 0x110.
> > 
> 
> See pipe_hw_ids field of max96717_chip_info.
> MAX9295A has pipes 0, 1, 2, 3, MAX96717 has pipe 2 only.
> Registers and strides are the same, just pipes are missing.
You are right my brain is just not really good for math today :)