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

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Message-ID: <5fad0945-27a5-4c49-8f20-59c197fc1ba0@gmail.com>
Date: Thu, 3 Jul 2025 15:31:58 +0300
From: Cosmin Tanislav <demonsingur@...il.com>
To: Julien Massot <julien.massot@...labora.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 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.

> 
>