[source] ar71xx: spi-rb4xx fix.

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/?p=source.git;a=commitdiff;h=c312cef223ddc164b8d3fd3a195eb88a43ede901

commit c312cef223ddc164b8d3fd3a195eb88a43ede901
Author: Sergey Sergeev <adron at yapic.net>
AuthorDate: Thu Jun 30 13:23:15 2016 +0300

    ar71xx: spi-rb4xx fix.
    
    In new kernels we should use clk_prepare_enable instead of clk_enable
    since clk_enable does not make proper initialization that leads
    to rise WARN_ON messages and not working spi bus on the device.
    
    Signed-off-by: Sergey Sergeev <adron at yapic.net>
---
 target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c b/target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c
index 56260ff..357fd41 100644
--- a/target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c
+++ b/target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c
@@ -413,7 +413,7 @@ static int rb4xx_spi_probe(struct platform_device *pdev)
 		goto err_put_master;
 	}
 
-	err = clk_enable(rbspi->ahb_clk);
+	err = clk_prepare_enable(rbspi->ahb_clk);
 	if (err)
 		goto err_clk_put;