Merge series "Some bug fix for lpspi" from Clark Wang <xiaoning.wang@…

…nxp.com>:

Hi,

This patchset mainly fixes some recently discovered problems about CS for
LPSPI module on i.MX8DXLEVK.

Add the dt-bindings description for the new property.

Clark Wang (4):
  spi: lpspi: Fix kernel warning dump when probe fail after calling
    spi_register
  spi: lpspi: remove unused fsl_lpspi->chipselect
  spi: lpspi: fix using CS discontinuously on i.MX8DXLEVK
  dt-bindings: lpspi: New property in document DT bindings for LPSPI

 .../bindings/spi/spi-fsl-lpspi.yaml           |  7 ++++++
 drivers/spi/spi-fsl-lpspi.c                   | 25 +++++++++++--------
 2 files changed, 21 insertions(+), 11 deletions(-)

--
2.17.1

drivers/spi/spi-fsl-lpspi.c

@@ -98,6 +98,7 @@ struct fsl_lpspi_data {
 	struct clk *clk_ipg;
 	struct clk *clk_per;
 	bool is_slave;
+	bool is_only_cs1;
 	bool is_first_byte;
 
 	void *rx_buf;
@@ -119,8 +120,6 @@ struct fsl_lpspi_data {
 	bool usedma;
 	struct completion dma_rx_completion;
 	struct completion dma_tx_completion;
-
-	int chipselect[];
 };
 
 static const struct of_device_id fsl_lpspi_dt_ids[] = {
@@ -259,10 +258,9 @@ static void fsl_lpspi_set_cmd(struct fsl_lpspi_data *fsl_lpspi)
 
 	temp |= fsl_lpspi->config.bpw - 1;
 	temp |= (fsl_lpspi->config.mode & 0x3) << 30;
+	temp |= (fsl_lpspi->config.chip_select & 0x3) << 24;
 	if (!fsl_lpspi->is_slave) {
 		temp |= fsl_lpspi->config.prescale << 27;
-		temp |= (fsl_lpspi->config.chip_select & 0x3) << 24;
-
 		/*
 		 * Set TCR_CONT will keep SS asserted after current transfer.
 		 * For the first transfer, clear TCR_CONTC to assert SS.
@@ -423,7 +421,10 @@ static int fsl_lpspi_setup_transfer(struct spi_controller *controller,
 	fsl_lpspi->config.mode = spi->mode;
 	fsl_lpspi->config.bpw = t->bits_per_word;
 	fsl_lpspi->config.speed_hz = t->speed_hz;
-	fsl_lpspi->config.chip_select = spi->chip_select;
+	if (fsl_lpspi->is_only_cs1)
+		fsl_lpspi->config.chip_select = 1;
+	else
+		fsl_lpspi->config.chip_select = spi->chip_select;
 
 	if (!fsl_lpspi->config.speed_hz)
 		fsl_lpspi->config.speed_hz = spi->max_speed_hz;
@@ -837,6 +838,8 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
 	fsl_lpspi = spi_controller_get_devdata(controller);
 	fsl_lpspi->dev = &pdev->dev;
 	fsl_lpspi->is_slave = is_slave;
+	fsl_lpspi->is_only_cs1 = of_property_read_bool((&pdev->dev)->of_node,
+						"fsl,spi-only-use-cs1-sel");
 
 	controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32);
 	controller->transfer_one = fsl_lpspi_transfer_one;
@@ -850,12 +853,6 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
 	if (!fsl_lpspi->is_slave)
 		controller->use_gpio_descriptors = true;
 
-	ret = devm_spi_register_controller(&pdev->dev, controller);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "spi_register_controller error.\n");
-		goto out_controller_put;
-	}
-
 	init_completion(&fsl_lpspi->xfer_done);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -913,6 +910,12 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
 	if (ret < 0)
 		dev_err(&pdev->dev, "dma setup error %d, use pio\n", ret);
 
+	ret = devm_spi_register_controller(&pdev->dev, controller);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "spi_register_controller error.\n");
+		goto out_pm_get;
+	}
+
 	pm_runtime_mark_last_busy(fsl_lpspi->dev);
 	pm_runtime_put_autosuspend(fsl_lpspi->dev);