linux-kernel - [RFC PATCH 0/2] serial: 8250_dw: IO space + polling mode support

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Message-ID: <1519324923-196857-1-git-send-email-john.garry@huawei.com>
Date:   Fri, 23 Feb 2018 02:42:01 +0800
From:   John Garry <john.garry@...wei.com>
To:     <andriy.shevchenko@...ux.intel.com>, <gregkh@...uxfoundation.org>,
        <slaby@...e.com>, <p.zabel@...gutronix.de>, <heiko@...ech.de>,
        <ed.blake@...drel.com>, <jhogan@...nel.org>
CC:     <linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>
Subject: [RFC PATCH 0/2] serial: 8250_dw: IO space + polling mode support

There is a requirement for supporting an 8250-compatible UART with
the following profile/features:
- platform device
- polling mode (i.e. no interrupt support)
- ACPI FW
- IO port iotype
- 16550-compatible

For OF, we have 8250_of.c, and for PNP device we have 8250_pnp.c
drivers. However there does not seem to any driver satisfying
the above requirements. So this RFC is to find opinion on
modifying the Synopsys DW 8250_dw.c driver to support these
generic features.

With patch 2/2, we're relaxing the interrupt support requirement.
As I mentioned in the commit log, the 8250_of.c driver seems to
ignore the dt bindings, and I do the same.

John Garry (2):
  serial: 8250_dw: add IO space support
  serial: 8250_dw: support polling mode

 drivers/tty/serial/8250/8250_dw.c | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)

-- 
1.9.1