[PATCH 2/3] arch/arm/boards/avnet-zedboard/lowlevel.c: added SDIO clk frequency configuration

[Gwenhael Goavec-Merou <gwenj@trabucayre.com>]

From: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>

As mentionned in [1] MMC sometime fails to be initialized/ is not
working with this type of error:

arasan-sdhci e0100000.mmc@e0100000.of: registered as mmc0
malloc space: 0x17e00000 -> 0x1fdfffff (size 128 MiB)
arasan-sdhci e0100000.mmc@e0100000.of: error while transferring data for command 6
arasan-sdhci e0100000.mmc@e0100000.of: state = 0x01ff0202 , interrupt = 0x00208000
mmc0: Card's startup fails with -74
barebox-environment chosen:environment-sd.of: probe failed: No such file or directory
environment load /dev/env0: No such file or directory

This patch adds SDIO clck configuration allowing to have a valid MMC
clock frequency.

[1] https://lore.barebox.org/barebox/VI1PR02MB4429606E3B06D0F53D2B4175AB4DA@VI1PR02MB4429.eurprd02.prod.outlook.com/T/#m1cb8598da4741c0b7a41944e1aecef373dd74319

Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
---
 arch/arm/boards/avnet-zedboard/lowlevel.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boards/avnet-zedboard/lowlevel.c b/arch/arm/boards/avnet-zedboard/lowlevel.c
index 605aab783a..b7a98f5a82 100644
--- a/arch/arm/boards/avnet-zedboard/lowlevel.c
+++ b/arch/arm/boards/avnet-zedboard/lowlevel.c
@@ -241,6 +241,7 @@ static void avnet_zedboard_ps7_init(void)
 	/* poor mans clkctrl */
 	writel(0x00001403, ZYNQ_CLOCK_CTRL_BASE + ZYNQ_UART_CLK_CTRL);
 	writel(0x00000101, ZYNQ_CLOCK_CTRL_BASE + ZYNQ_LQSPI_CLK_CTRL);
+	writel(0x00001401, ZYNQ_CLOCK_CTRL_BASE + ZYNQ_SDIO_CLK_CTRL);
 
 	/* GEM0 */
 	writel(0x00000001, 0xf8000138);
-- 
2.47.2