add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/spi/spi-bcm63xx.c
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@@ -1,18 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Broadcom BCM63xx SPI controller support
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  *
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  * Copyright (C) 2009-2012 Florian Fainelli <florian@openwrt.org>
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  * Copyright (C) 2010 Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version 2
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- * of the License, or (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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  */
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 #include <linux/kernel.h>
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@@ -27,6 +18,7 @@
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 #include <linux/err.h>
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 #include <linux/pm_runtime.h>
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 #include <linux/of.h>
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+#include <linux/reset.h>
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 /* BCM 6338/6348 SPI core */
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 #define SPI_6348_RSET_SIZE		64
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@@ -134,7 +126,7 @@
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 	SPI_MSG_DATA_SIZE,
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 };
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-#define BCM63XX_SPI_MAX_PREPEND		15
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+#define BCM63XX_SPI_MAX_PREPEND		7
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 #define BCM63XX_SPI_MAX_CS		8
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 #define BCM63XX_SPI_BUS_NUM		0
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@@ -377,7 +369,7 @@
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 		}
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 		/* CS will be deasserted directly after transfer */
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-		if (t->delay_usecs) {
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+		if (t->delay_usecs || t->delay.value) {
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 			dev_err(&spi->dev, "unable to keep CS asserted after transfer\n");
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 			status = -EINVAL;
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 			goto exit;
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@@ -502,6 +494,7 @@
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 	struct bcm63xx_spi *bs;
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 	int ret;
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 	u32 num_cs = BCM63XX_SPI_MAX_CS;
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+	struct reset_control *reset;
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 	if (dev->of_node) {
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 		const struct of_device_id *match;
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@@ -529,16 +522,18 @@
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 	}
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 	irq = platform_get_irq(pdev, 0);
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-	if (irq < 0) {
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-		dev_err(dev, "no irq: %d\n", irq);
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+	if (irq < 0)
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 		return irq;
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-	}
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 	clk = devm_clk_get(dev, "spi");
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 	if (IS_ERR(clk)) {
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 		dev_err(dev, "no clock for device\n");
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 		return PTR_ERR(clk);
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 	}
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+
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+	reset = devm_reset_control_get_optional_exclusive(dev, NULL);
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+	if (IS_ERR(reset))
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+		return PTR_ERR(reset);
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 	master = spi_alloc_master(dev, sizeof(*bs));
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 	if (!master) {
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@@ -590,6 +585,12 @@
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 	if (ret)
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 		goto out_err;
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+	ret = reset_control_reset(reset);
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+	if (ret) {
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+		dev_err(dev, "unable to reset device: %d\n", ret);
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+		goto out_clk_disable;
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+	}
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+
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 	bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
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 	/* register and we are done */