linux-kernel - Re: [PATCH] serial: Do not treat the IIR register as a bitfield

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Date:   Thu, 30 Mar 2017 13:27:19 +0530
From:   Vignesh R <vigneshr@...com>
To:     Olliver Schinagl <oliver@...inagl.nl>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Stephen Warren <swarren@...dotorg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Alexandre Courbot <gnurou@...il.com>,
        "David S . Miller" <davem@...emloft.net>
CC:     "dev@...ux-sunxi.org" <dev@...ux-sunxi.org>,
        Ed Blake <ed.blake@...tec.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Alexander Sverdlin <alexander.sverdlin@...ia.com>,
        Yegor Yefremov <yegorslists@...glemail.com>,
        Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@...el.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Jason Uy <jason.uy@...adcom.com>,
        Douglas Anderson <dianders@...omium.org>,
        Peter Hurley <peter@...leysoftware.com>,
        Tony Lindgren <tony@...mide.com>,
        Thor Thayer <tthayer@...nsource.altera.com>,
        David Lechner <david@...hnology.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>
Subject: Re: [PATCH] serial: Do not treat the IIR register as a bitfield



On Thursday 30 March 2017 12:13 PM, Olliver Schinagl wrote:
> 
> 
> On March 30, 2017 8:15:29 AM CEST, Vignesh R <vigneshr@...com> wrote:
>> Hi,
>>
>> On Thursday 30 March 2017 12:14 AM, Olliver Schinagl wrote:
>>> diff --git a/include/uapi/linux/serial_reg.h
>> b/include/uapi/linux/serial_reg.h
>>> index 5db76880b4ad..489522389a10 100644
>>> --- a/include/uapi/linux/serial_reg.h
>>> +++ b/include/uapi/linux/serial_reg.h
>>> @@ -31,18 +31,18 @@
>>>  #define UART_IERX_SLEEP		0x10 /* Enable sleep mode */
>>>  
>>>  #define UART_IIR	2	/* In:  Interrupt ID Register */
>>> -#define UART_IIR_NO_INT		0x01 /* No interrupts pending */
>>> -#define UART_IIR_ID		0x0e /* Mask for the interrupt ID */
>>>  #define UART_IIR_MSI		0x00 /* Modem status interrupt */
>>> +#define UART_IIR_NO_INT		0x01 /* No interrupts pending */
>>>  #define UART_IIR_THRI		0x02 /* Transmitter holding register empty */
>>>  #define UART_IIR_RDI		0x04 /* Receiver data interrupt */
>>>  #define UART_IIR_RLSI		0x06 /* Receiver line status interrupt */
>>> -
>>>  #define UART_IIR_BUSY		0x07 /* DesignWare APB Busy Detect */
>>> +#define UART_IIR_RX_TIMEOUT	0x0c /* DesignWare RX Timeout interrupt
>> */
> It was moved due to sorting. The comment could be changed maybe? I renamed it from omap to dw as i believe the omap also uses the dw ip. But i think it is a defacto standard mapping of the irr register?

AFAIK, OMAP UART does not use DW core, please make these IDs generic to
avoid confusion.

> 
>>> +#define UART_IIR_MASK		0x0f /* DesignWare IIR mask */
>>>  
>>> -#define UART_IIR_RX_TIMEOUT	0x0c /* OMAP RX Timeout interrupt */
>>
>> You are removing UART_IIR_RX_TIMEOUT? Is this intended?
>>
>>>  #define UART_IIR_XOFF		0x10 /* OMAP XOFF/Special Character */
>>>  #define UART_IIR_CTS_RTS_DSR	0x20 /* OMAP CTS/RTS/DSR Change */
>>> +#define UART_IIR_EXT_MASK	0x30 /* OMAP extended IIR mask */
> 

-- 
Regards
Vignesh