linux-kernel - Re: [RFC PATCH v1 13/18] gpu: host1x: mipi: Add of_tegra_mipi

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Date:   Wed, 10 Jun 2020 16:33:44 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, frankc@...dia.com,
        hverkuil@...all.nl, sakari.ailus@....fi, robh+dt@...nel.org,
        helen.koike@...labora.com
Cc:     sboyd@...nel.org, gregkh@...uxfoundation.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org
Subject: Re: [RFC PATCH v1 13/18] gpu: host1x: mipi: Add
 of_tegra_mipi_request() API

10.06.2020 09:02, Sowjanya Komatineni пишет:
> This patch adds an API of_tegra_mipi_request() to allow creating
> mipi device for specific device node rather than a device so Tegra
> CSI driver can use it for calibrating MIPI pads for each stream
> independently.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>  drivers/gpu/host1x/mipi.c | 10 ++++++++--
>  include/linux/host1x.h    |  2 ++
>  2 files changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/host1x/mipi.c b/drivers/gpu/host1x/mipi.c
> index e00809d..f51fe69 100644
> --- a/drivers/gpu/host1x/mipi.c
> +++ b/drivers/gpu/host1x/mipi.c
> @@ -206,9 +206,9 @@ static int tegra_mipi_power_down(struct tegra_mipi *mipi)
>  	return 0;
>  }
>  
> -struct tegra_mipi_device *tegra_mipi_request(struct device *device)
> +struct tegra_mipi_device *of_tegra_mipi_request(struct device *device,
> +						struct device_node *np)
>  {
> -	struct device_node *np = device->of_node;
>  	struct tegra_mipi_device *dev;
>  	struct of_phandle_args args;
>  	int err;
> @@ -252,6 +252,12 @@ struct tegra_mipi_device *tegra_mipi_request(struct device *device)
>  	of_node_put(args.np);
>  	return ERR_PTR(err);
>  }
> +EXPORT_SYMBOL(of_tegra_mipi_request);
> +
> +struct tegra_mipi_device *tegra_mipi_request(struct device *device)
> +{
> +	return of_tegra_mipi_request(device, device->of_node);
> +}
>  EXPORT_SYMBOL(tegra_mipi_request);
>  
>  void tegra_mipi_free(struct tegra_mipi_device *device)
> diff --git a/include/linux/host1x.h b/include/linux/host1x.h
> index c230b4e..a61ca52 100644
> --- a/include/linux/host1x.h
> +++ b/include/linux/host1x.h
> @@ -325,6 +325,8 @@ int host1x_client_resume(struct host1x_client *client);
>  
>  struct tegra_mipi_device;
>  
> +struct tegra_mipi_device *of_tegra_mipi_request(struct device *device,
> +						struct device_node *np);

Looks like adding a new function here is a bit of overkill. What about
to change tegra_mipi_request() to take the node argument?