On Tue, Apr 28, 2015 at 02:55:46AM +0300, Dmitry Eremin-Solenikov wrote:

+static int locomospi_reg_open(struct locomospi_dev *spidev)
+{

+static int locomospi_reg_release(struct locomospi_dev *spidev)
+{

These are a bit weird - as far as I can tell they're just doing some
init done on probe and release?  I think I'd expect to see them either
inlined there or done as part of the PM operations too (including
runtime ones).

+	for (j = 0; j < wait; j++) {
+		regmap_read(spidev->regmap, LOCOMO_SPIST, &r);
+		if (r & LOCOMO_SPI_RFW)
+			break;
+	}
+	if (j == wait)
+		dev_err(&spi->dev, "rfw timeout\n");

But we don't return an error if we time out?

+static int locomo_spi_setup_transfer(struct spi_device *spi,
+		struct spi_transfer *t)
+{
+	struct locomospi_dev *spidev;
+	u32 hz = 0;
+
+	if (t)
+		hz = t->speed_hz;
+	if (!hz)
+		hz = spi->max_speed_hz;

The core will set a speed on every transfer for you.

+	if (!tx && !rx && t->len)
+		return -EINVAL;

Put this in the core if it's needed.

+static int locomo_spi_remove(struct platform_device *pdev)
+{
+	struct spi_master *master = platform_get_drvdata(pdev);
+	struct locomospi_dev *spidev = spi_master_get_devdata(master);
+
+	return locomospi_reg_release(spidev);

We're doing this release before we free the master which is potentially
racy - but do we even need to do it at all?