ramips: clean up rt2880 spi probe/remove

* fill struct according to the member order
* add error clean up
* set min/max spi speed. so we don't need to check again

Signed-off-by: Michael Lee <igvtee@gmail.com>

SVN-Revision: 47576

target/linux/ramips/patches-3.18/0050-SPI-ralink-add-Ralink-SoC-spi-driver.patch

@@ -41,7 +41,7 @@ Acked-by: John Crispin <blogic@openwrt.org>
  spi-s3c24xx-hw-$(CONFIG_SPI_S3C24XX_FIQ) += spi-s3c24xx-fiq.o
 --- /dev/null
 +++ b/drivers/spi/spi-rt2880.c
-@@ -0,0 +1,479 @@
+@@ -0,0 +1,488 @@
 +/*
 + * spi-rt2880.c -- Ralink RT288x/RT305x SPI controller driver
 + *
@@ -166,6 +166,9 @@ Acked-by: John Crispin <blogic@openwrt.org>
 +#define SPI1_POR			BIT(1)
 +#define SPI0_POR			BIT(0)
 +
++#define RT2880_SPI_MODE_BITS	(SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | \
++		SPI_CS_HIGH)
++
 +struct rt2880_spi {
 +	struct spi_master	*master;
 +	void __iomem		*base;
@@ -223,13 +226,6 @@ Acked-by: John Crispin <blogic@openwrt.org>
 +	rate = roundup_pow_of_two(rate);
 +	dev_dbg(&spi->dev, "rate-2:%u\n", rate);
 +
-+	/* check if requested speed is too small */
-+	if (rate > 128)
-+		return -EINVAL;
-+
-+	if (rate < 2)
-+		rate = 2;
-+
 +	/* Convert the rate to SPI clock divisor value.	*/
 +	prescale = ilog2(rate / 2);
 +	dev_dbg(&spi->dev, "prescale:%u\n", prescale);
@@ -430,11 +426,10 @@ Acked-by: John Crispin <blogic@openwrt.org>
 +{
 +	struct spi_master *master;
 +	struct rt2880_spi *rs;
-+	unsigned long flags;
 +	void __iomem *base;
 +	struct resource *r;
-+	int status = 0;
 +	struct clk *clk;
++	int ret;
 +
 +	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 +	base = devm_ioremap_resource(&pdev->dev, r);
@@ -443,36 +438,37 @@ Acked-by: John Crispin <blogic@openwrt.org>
 +
 +	clk = devm_clk_get(&pdev->dev, NULL);
 +	if (IS_ERR(clk)) {
-+		dev_err(&pdev->dev, "unable to get SYS clock, err=%d\n",
-+			status);
++		dev_err(&pdev->dev, "unable to get SYS clock\n");
 +		return PTR_ERR(clk);
 +	}
 +
-+	status = clk_prepare_enable(clk);
-+	if (status)
-+		return status;
++	ret = clk_prepare_enable(clk);
++	if (ret)
++		goto err_clk;
 +
 +	master = spi_alloc_master(&pdev->dev, sizeof(*rs));
 +	if (master == NULL) {
 +		dev_dbg(&pdev->dev, "master allocation failed\n");
-+		return -ENOMEM;
++		ret = -ENOMEM;
++		goto err_clk;
 +	}
 +
-+	/* we support only mode 0, and no options */
-+	master->mode_bits = 0;
-+
++	master->dev.of_node = pdev->dev.of_node;
++	master->mode_bits = RT2880_SPI_MODE_BITS;
++	master->bits_per_word_mask = SPI_BPW_MASK(8);
++	master->min_speed_hz = clk_get_rate(clk) / 128;
++	master->max_speed_hz = clk_get_rate(clk) / 2;
++	master->flags = SPI_MASTER_HALF_DUPLEX;
 +	master->setup = rt2880_spi_setup;
 +	master->transfer_one_message = rt2880_spi_transfer_one_message;
 +	master->num_chipselect = RALINK_NUM_CHIPSELECTS;
-+	master->bits_per_word_mask = SPI_BPW_MASK(8);
-+	master->dev.of_node = pdev->dev.of_node;
 +
 +	dev_set_drvdata(&pdev->dev, master);
 +
 +	rs = spi_master_get_devdata(master);
++	rs->master = master;
 +	rs->base = base;
 +	rs->clk = clk;
-+	rs->master = master;
 +	rs->sys_freq = clk_get_rate(rs->clk);
 +	dev_dbg(&pdev->dev, "sys_freq: %u\n", rs->sys_freq);
 +
@@ -480,7 +476,21 @@ Acked-by: John Crispin <blogic@openwrt.org>
 +
 +	rt2880_spi_reset(rs);
 +
-+	return spi_register_master(master);
++	ret = devm_spi_register_master(&pdev->dev, master);
++	if (ret < 0) {
++		dev_err(&pdev->dev, "devm_spi_register_master error.\n");
++		goto err_master;
++	}
++
++	return ret;
++
++err_master:
++	spi_master_put(master);
++	kfree(master);
++err_clk:
++	clk_disable_unprepare(clk);
++
++	return ret;
 +}
 +
 +static int rt2880_spi_remove(struct platform_device *pdev)
@@ -491,8 +501,7 @@ Acked-by: John Crispin <blogic@openwrt.org>
 +	master = dev_get_drvdata(&pdev->dev);
 +	rs = spi_master_get_devdata(master);
 +
-+	clk_disable(rs->clk);
-+	spi_unregister_master(master);
++	clk_disable_unprepare(rs->clk);
 +
 +	return 0;
 +}