[PATCH] Documentation: spi: add SPDX license identifier

[Diogo Pimenta]

Add missing SPDX-License-Identifier tag to SPI documentation file.

This file is part of the kernel documentation and must include
an SPDX license identifier to comply with kernel documentation
licensing requirements and improve automated license scanning.

No functional changes are introduced.

Signed-off-by: Diogo Pimenta <diogo2003.pimenta@xxxxxxxxx>
---
 Documentation/spi/spi-summary.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/spi/spi-summary.rst b/Documentation/spi/spi-summary.rst
index 6e21e6f86912..23e07ba4f8cc 100644
--- a/Documentation/spi/spi-summary.rst
+++ b/Documentation/spi/spi-summary.rst
@@ -1,3 +1,4 @@
+.. SPDX-License-Identifier: GPL-2.0-only
 ====================================
 Overview of Linux kernel SPI support
 ====================================
-- 
2.53.0