add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/spi/spi-pic32.c
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@@ -1,17 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Microchip PIC32 SPI controller driver.
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  *
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  * Purna Chandra Mandal <purna.mandal@microchip.com>
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  * Copyright (c) 2016, Microchip Technology Inc.
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- *
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- * This program is free software; you can distribute it and/or modify it
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- * under the terms of the GNU General Public License (Version 2) as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope it will be useful, but WITHOUT
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- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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- * for more details.
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  */
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8
 
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 #include <linux/clk.h>
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@@ -560,7 +552,7 @@
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 		dev_err(&spi->dev, "wait error/timedout\n");
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 		if (dma_issued) {
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 			dmaengine_terminate_all(master->dma_rx);
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-			dmaengine_terminate_all(master->dma_rx);
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+			dmaengine_terminate_all(master->dma_tx);
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 		}
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 		ret = -ETIMEDOUT;
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 	} else {
..
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@@ -615,25 +607,30 @@
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 	gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
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 }
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-static void pic32_spi_dma_prep(struct pic32_spi *pic32s, struct device *dev)
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+static int pic32_spi_dma_prep(struct pic32_spi *pic32s, struct device *dev)
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 {
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 	struct spi_master *master = pic32s->master;
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-	dma_cap_mask_t mask;
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+	int ret = 0;
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-	dma_cap_zero(mask);
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-	dma_cap_set(DMA_SLAVE, mask);
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+	master->dma_rx = dma_request_chan(dev, "spi-rx");
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+	if (IS_ERR(master->dma_rx)) {
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+		if (PTR_ERR(master->dma_rx) == -EPROBE_DEFER)
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+			ret = -EPROBE_DEFER;
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+		else
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+			dev_warn(dev, "RX channel not found.\n");
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621
 
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-	master->dma_rx = dma_request_slave_channel_compat(mask, NULL, NULL,
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-							  dev, "spi-rx");
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-	if (!master->dma_rx) {
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-		dev_warn(dev, "RX channel not found.\n");
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+		master->dma_rx = NULL;
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 		goto out_err;
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 	}
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-	master->dma_tx = dma_request_slave_channel_compat(mask, NULL, NULL,
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-							  dev, "spi-tx");
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-	if (!master->dma_tx) {
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-		dev_warn(dev, "TX channel not found.\n");
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+	master->dma_tx = dma_request_chan(dev, "spi-tx");
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+	if (IS_ERR(master->dma_tx)) {
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+		if (PTR_ERR(master->dma_tx) == -EPROBE_DEFER)
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+			ret = -EPROBE_DEFER;
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+		else
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+			dev_warn(dev, "TX channel not found.\n");
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+
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+		master->dma_tx = NULL;
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 		goto out_err;
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 	}
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..
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@@ -643,14 +640,20 @@
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 	/* DMA chnls allocated and prepared */
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 	set_bit(PIC32F_DMA_PREP, &pic32s->flags);
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-	return;
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+	return 0;
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 out_err:
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-	if (master->dma_rx)
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+	if (master->dma_rx) {
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 		dma_release_channel(master->dma_rx);
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+		master->dma_rx = NULL;
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+	}
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-	if (master->dma_tx)
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+	if (master->dma_tx) {
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 		dma_release_channel(master->dma_tx);
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+		master->dma_tx = NULL;
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+	}
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+
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+	return ret;
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 }
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 static void pic32_spi_dma_unprep(struct pic32_spi *pic32s)
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@@ -720,22 +723,16 @@
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 	/* get irq resources: err-irq, rx-irq, tx-irq */
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 	pic32s->fault_irq = platform_get_irq_byname(pdev, "fault");
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-	if (pic32s->fault_irq < 0) {
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-		dev_err(&pdev->dev, "fault-irq not found\n");
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+	if (pic32s->fault_irq < 0)
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 		return pic32s->fault_irq;
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-	}
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 	pic32s->rx_irq = platform_get_irq_byname(pdev, "rx");
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-	if (pic32s->rx_irq < 0) {
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-		dev_err(&pdev->dev, "rx-irq not found\n");
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+	if (pic32s->rx_irq < 0)
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 		return pic32s->rx_irq;
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-	}
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 	pic32s->tx_irq = platform_get_irq_byname(pdev, "tx");
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-	if (pic32s->tx_irq < 0) {
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-		dev_err(&pdev->dev, "tx-irq not found\n");
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+	if (pic32s->tx_irq < 0)
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 		return pic32s->tx_irq;
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-	}
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 	/* get clock */
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 	pic32s->clk = devm_clk_get(&pdev->dev, "mck0");
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@@ -775,7 +772,7 @@
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 	if (ret)
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 		goto err_master;
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-	master->dev.of_node	= of_node_get(pdev->dev.of_node);
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+	master->dev.of_node	= pdev->dev.of_node;
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 	master->mode_bits	= SPI_MODE_3 | SPI_MODE_0 | SPI_CS_HIGH;
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 	master->num_chipselect	= 1; /* single chip-select */
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 	master->max_speed_hz	= clk_get_rate(pic32s->clk);
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@@ -791,7 +788,10 @@
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 	master->unprepare_transfer_hardware	= pic32_spi_unprepare_hardware;
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 	/* optional DMA support */
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-	pic32_spi_dma_prep(pic32s, &pdev->dev);
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+	ret = pic32_spi_dma_prep(pic32s, &pdev->dev);
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+	if (ret)
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+		goto err_bailout;
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+
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 	if (test_bit(PIC32F_DMA_PREP, &pic32s->flags))
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 		master->can_dma	= pic32_spi_can_dma;
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