linux-kernel - Re: [PATCH v14 15/18] media: i2c: ds90ub953: Handle V4L2_MBUS_CSI2_NONCONTINUOUS

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Message-ID: <ZIxyqTdEsS40emBV@smile.fi.intel.com>
Date:   Fri, 16 Jun 2023 17:33:13 +0300
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        Luca Ceresoli <luca.ceresoli@...tlin.com>,
        Matti Vaittinen <Matti.Vaittinen@...rohmeurope.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Wolfram Sang <wsa@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Peter Rosin <peda@...ntia.se>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Michael Tretter <m.tretter@...gutronix.de>,
        Hans Verkuil <hverkuil@...all.nl>,
        Mike Pagano <mpagano@...too.org>,
        Krzysztof Hałasa <khalasa@...p.pl>,
        Marek Vasut <marex@...x.de>,
        Satish Nagireddy <satish.nagireddy@...cruise.com>
Subject: Re: [PATCH v14 15/18] media: i2c: ds90ub953: Handle
 V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK

On Fri, Jun 16, 2023 at 04:59:19PM +0300, Tomi Valkeinen wrote:
> Handle V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK flag to configure the CSI-2 RX
> continuous/non-continuous clock register.

...

>  	struct regmap		*regmap;

I forgot if we discussed this along with i2c_client *client nearby. Since I
reviewed Hans' patches the pure struct device *dev (instead of *client) might
make more sense, despite being duplicative with regmap associated device.

>  	u32			num_data_lanes;
> +	bool			non_cont_clk;
>  
>  	struct gpio_chip	gpio_chip;

And also try to place this as a first member and see (by using bloat-o-meter,
for example) if it saves bytes.

I'm wondering if we have tools like pahole but which suggests the better layout
based on the code generation... Maybe something along with clang?

-- 
With Best Regards,
Andy Shevchenko