linux-kernel - Re: [PATCH] serial: 8250_tegra: Create Tegra specific 8250 driver

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Date:   Tue, 21 Jan 2020 19:37:57 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Jon Hunter <jonathanh@...dia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, Jeff Brasen <jbrasen@...dia.com>
Subject: Re: [PATCH] serial: 8250_tegra: Create Tegra specific 8250 driver

21.01.2020 19:31, Dmitry Osipenko пишет:
> Hello Jon,
> 
> 20.01.2020 19:01, Jon Hunter пишет:
> 
> [snip]
> 
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	if (!res)
>> +		return -ENODEV;
>> +
>> +	port->membase = devm_ioremap(&pdev->dev, res->start,
>> +				     resource_size(res));
> 
> devm_platform_ioremap_resource()
> 
>> +	if (!port->membase)
>> +		return -ENOMEM;
>> +
>> +	port->mapbase = res->start;
>> +	port->mapsize = resource_size(res);
>> +
>> +	uart->rst = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
> 
> Why reset is shared? It shall not be shared at least on T20/30/124/210..
> 
> [snip]
> 

Actually, looks like use of a shared reset for a not-really-shared reset
should be fine.