i2c: designware: Add SPDX license tag

Replace short statement in comment with proper SPDX license tag.

Note, for i2c-desingware-slave.c the identifier is chosen
in accordance with MODULE_LICENSE() macro since it is visible to user.
Another point to this choice is that the header seems to be copy'n'paste
from the other file of this very driver.
Acked-by: Luis Oliveira <Luis.Oliveira@synopsys.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-designware-baytrail.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel BayTrail PMIC I2C bus semaphore implementaion
  * Copyright (c) 2014, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 #include <linux/delay.h>
 #include <linux/device.h>

drivers/i2c/busses/i2c-designware-common.c

+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Synopsys DesignWare I2C adapter driver.
  *
@@ -6,20 +7,6 @@
  * Copyright (C) 2006 Texas Instruments.
  * Copyright (C) 2007 MontaVista Software Inc.
  * Copyright (C) 2009 Provigent Ltd.
- *
- * ----------------------------------------------------------------------------
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * ----------------------------------------------------------------------------
- *
  */
 #include <linux/clk.h>
 #include <linux/delay.h>

drivers/i2c/busses/i2c-designware-core.h

+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * Synopsys DesignWare I2C adapter driver.
  *
@@ -6,20 +7,6 @@
  * Copyright (C) 2006 Texas Instruments.
  * Copyright (C) 2007 MontaVista Software Inc.
  * Copyright (C) 2009 Provigent Ltd.
- *
- * ----------------------------------------------------------------------------
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * ----------------------------------------------------------------------------
- *
  */
 
 #include <linux/i2c.h>

drivers/i2c/busses/i2c-designware-master.c

+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Synopsys DesignWare I2C adapter driver (master only).
  *
@@ -6,20 +7,6 @@
  * Copyright (C) 2006 Texas Instruments.
  * Copyright (C) 2007 MontaVista Software Inc.
  * Copyright (C) 2009 Provigent Ltd.
- *
- * ----------------------------------------------------------------------------
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * ----------------------------------------------------------------------------
- *
  */
 #include <linux/delay.h>
 #include <linux/err.h>

drivers/i2c/busses/i2c-designware-pcidrv.c

+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Synopsys DesignWare I2C adapter driver (master only).
  *
@@ -7,22 +8,7 @@
  * Copyright (C) 2007 MontaVista Software Inc.
  * Copyright (C) 2009 Provigent Ltd.
  * Copyright (C) 2011, 2015, 2016 Intel Corporation.
- *
- * ----------------------------------------------------------------------------
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * ----------------------------------------------------------------------------
- *
  */
-
 #include <linux/acpi.h>
 #include <linux/delay.h>
 #include <linux/err.h>

drivers/i2c/busses/i2c-designware-platdrv.c

+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Synopsys DesignWare I2C adapter driver.
  *
@@ -6,20 +7,6 @@
  * Copyright (C) 2006 Texas Instruments.
  * Copyright (C) 2007 MontaVista Software Inc.
  * Copyright (C) 2009 Provigent Ltd.
- *
- * ----------------------------------------------------------------------------
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * ----------------------------------------------------------------------------
- *
  */
 #include <linux/acpi.h>
 #include <linux/clk-provider.h>

drivers/i2c/busses/i2c-designware-slave.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Synopsys DesignWare I2C adapter driver (slave only).
  *
  * Based on the Synopsys DesignWare I2C adapter driver (master).
  *
  * Copyright (C) 2016 Synopsys Inc.
- *
- * ----------------------------------------------------------------------------
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * ----------------------------------------------------------------------------
- *
  */
 #include <linux/delay.h>
 #include <linux/err.h>