linux-kernel - Re: [PATCH v2] i2c: axxia: Add I2C driver for AXM55xx

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Date:	Mon, 29 Sep 2014 13:13:00 +0200
From:	Anders Berg <anders.berg@...gotech.com>
To:	Varka Bhadram <varkabhadram@...il.com>
Cc:	Wolfram Sang <wsa@...-dreams.de>,
	devicetree <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH v2] i2c: axxia: Add I2C driver for AXM55xx

On Mon, Sep 29, 2014 at 12:07 PM, Varka Bhadram <varkabhadram@...il.com> wrote:
> On 09/29/2014 03:02 PM, Anders Berg wrote:
>>
>> Add I2C bus driver for the controller found in the LSI Axxia family SoCs.
>> The
>> driver implements 10-bit addressing and SMBus transfer modes via emulation
>> (including SMBus block data read).
>>
>> Signed-off-by: Anders Berg <anders.berg@...gotech.com>
>> ---
>>
(...)
>> +
>> +       if (!idev->msg) {
>> +               dev_warn(idev->dev, "unexpected interrupt");
>
>
> Missed terminating new line '\n'
>

Right, I'll fix that (all occurrences)

>
>> +               goto out;
>> +       }
>> +
>> +       /* RX FIFO needs service? */
>> +       if (i2c_m_rd(idev->msg) && (status & MST_STATUS_RFL))
>> +               axxia_i2c_empty_rx_fifo(idev);
>> +
>> +       /* TX FIFO needs service? */
>> +       if (!i2c_m_rd(idev->msg) && (status & MST_STATUS_TFL)) {
>> +               if (axxia_i2c_fill_tx_fifo(idev) == 0)
>> +                       i2c_int_disable(idev, MST_STATUS_TFL);
>> +       }
>> +
>> +       if (status & MST_STATUS_SCC) {
>> +               /* Stop completed */
>> +               i2c_int_disable(idev, ~0);
>> +               complete(&idev->msg_complete);
>> +       } else if (status & MST_STATUS_SNS) {
>> +               /* Transfer done */
>> +               i2c_int_disable(idev, ~0);
>> +               if (i2c_m_rd(idev->msg) && idev->msg_xfrd <
>> idev->msg->len)
>> +                       axxia_i2c_empty_rx_fifo(idev);
>> +               complete(&idev->msg_complete);
>> +       } else if (unlikely(status & MST_STATUS_ERR)) {
>> +               /* Transfer error */
>> +               i2c_int_disable(idev, ~0);
>> +               if (status & MST_STATUS_AL)
>> +                       idev->msg_err = -EAGAIN;
>> +               else if (status & MST_STATUS_NAK)
>> +                       idev->msg_err = -ENXIO;
>> +               else
>> +                       idev->msg_err = -EIO;
>> +               dev_dbg(idev->dev, "error %#x, addr=%#x rx=%u/%u
>> tx=%u/%u\n",
>> +                       status,
>> +                       idev->msg->addr,
>> +                       readl(idev->base + MST_RX_BYTES_XFRD),
>> +                       readl(idev->base + MST_RX_XFER),
>> +                       readl(idev->base + MST_TX_BYTES_XFRD),
>> +                       readl(idev->base + MST_TX_XFER));
>> +               complete(&idev->msg_complete);
>> +       }
>> +
>> +out:
>> +       /* Clear interrupt */
>> +       writel(INT_MST, idev->base + INTERRUPT_STATUS);
>> +
>> +       return IRQ_HANDLED;
>> +}
>> +
>
>
> Its looks good if we move the entire ISR above probe/remove
> functionalities...
>

Not sure what you mean here... The ISR _is_ above probe/remove.

/Anders
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