add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/spi/spi-rb4xx.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * SPI controller driver for the Mikrotik RB4xx boards
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  *
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@@ -6,11 +7,6 @@
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  *
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  * This file was based on the patches for Linux 2.6.27.39 published by
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  * MikroTik for their RouterBoard 4xx series devices.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it 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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  */
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 #include <linux/kernel.h>
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@@ -18,6 +14,7 @@
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 #include <linux/platform_device.h>
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 #include <linux/clk.h>
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 #include <linux/spi/spi.h>
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+#include <linux/of.h>
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 #include <asm/mach-ath79/ar71xx_regs.h>
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@@ -139,12 +136,10 @@
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 	struct spi_master *master;
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 	struct clk *ahb_clk;
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 	struct rb4xx_spi *rbspi;
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-	struct resource *r;
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 	int err;
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 	void __iomem *spi_base;
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-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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-	spi_base = devm_ioremap_resource(&pdev->dev, r);
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+	spi_base = devm_platform_ioremap_resource(pdev, 0);
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 	if (IS_ERR(spi_base))
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 		return PTR_ERR(spi_base);
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@@ -156,13 +151,19 @@
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 	if (IS_ERR(ahb_clk))
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 		return PTR_ERR(ahb_clk);
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+	master->dev.of_node = pdev->dev.of_node;
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 	master->bus_num = 0;
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 	master->num_chipselect = 3;
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 	master->mode_bits = SPI_TX_DUAL;
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-	master->bits_per_word_mask = BIT(7);
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+	master->bits_per_word_mask = SPI_BPW_MASK(8);
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 	master->flags = SPI_MASTER_MUST_TX;
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 	master->transfer_one = rb4xx_transfer_one;
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 	master->set_cs = rb4xx_set_cs;
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+
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+	rbspi = spi_master_get_devdata(master);
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+	rbspi->base = spi_base;
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+	rbspi->clk = ahb_clk;
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+	platform_set_drvdata(pdev, rbspi);
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 	err = devm_spi_register_master(&pdev->dev, master);
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 	if (err) {
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@@ -173,11 +174,6 @@
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 	err = clk_prepare_enable(ahb_clk);
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 	if (err)
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 		return err;
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-
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-	rbspi = spi_master_get_devdata(master);
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-	rbspi->base = spi_base;
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-	rbspi->clk = ahb_clk;
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-	platform_set_drvdata(pdev, rbspi);
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 	/* Enable SPI */
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 	rb4xx_write(rbspi, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);
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@@ -194,11 +190,18 @@
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 	return 0;
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 }
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+static const struct of_device_id rb4xx_spi_dt_match[] = {
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+	{ .compatible = "mikrotik,rb4xx-spi" },
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+	{ },
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+};
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+MODULE_DEVICE_TABLE(of, rb4xx_spi_dt_match);
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+
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 static struct platform_driver rb4xx_spi_drv = {
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 	.probe = rb4xx_spi_probe,
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 	.remove = rb4xx_spi_remove,
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 	.driver = {
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 		.name = "rb4xx-spi",
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+		.of_match_table = of_match_ptr(rb4xx_spi_dt_match),
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 	},
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 };
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