[PATCH] clk: imx: fix ahb clock mux 1

* [PATCH] clk: imx: fix ahb clock mux 1
@ 2016-04-28 21:07 Stefan Agner
  2016-04-29  8:19 ` Uwe Kleine-König
  2016-05-03  8:32 ` Shawn Guo
  0 siblings, 2 replies; 6+ messages in thread
From: Stefan Agner @ 2016-04-28 21:07 UTC (permalink / raw)
  To: shawnguo, kernel
  Cc: mturquette, sboyd, linux-arm-kernel, linux-clk, linux-kernel,
	Stefan Agner

The clock parent of the AHB root clock when using mux option 1
is the SYS PLL 270MHz clock. This is specified in  Table 5-11
Clock Root Table of the i.MX 7Dual Applications Processor
Reference Manual.

While it could be a documentation error, the 270MHz parent is
also mentioned in the boot ROM configuration in Table 6-28: The
clock is by default at 135MHz due to a POST_PODF value of 1
(=> divider of 2).

Signed-off-by: Stefan Agner <stefan@agner.ch>
---
Hi Shawn,

I did not found a clock which was based on this clock which I
could measure externally... But the change is backed by the
documentation.

--
Stefan

 drivers/clk/imx/clk-imx7d.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk-imx7d.c b/drivers/clk/imx/clk-imx7d.c
index 7912be8..5229968 100644
--- a/drivers/clk/imx/clk-imx7d.c
+++ b/drivers/clk/imx/clk-imx7d.c
@@ -56,7 +56,7 @@ static const char *nand_usdhc_bus_sel[] = { "osc", "pll_sys_pfd2_270m_clk",
 	"pll_sys_pfd2_135m_clk", "pll_sys_pfd6_clk", "pll_enet_250m_clk",
 	"pll_audio_main_clk", };
 
-static const char *ahb_channel_sel[] = { "osc", "pll_sys_pfd2_135m_clk",
+static const char *ahb_channel_sel[] = { "osc", "pll_sys_pfd2_270m_clk",
 	"pll_dram_533m_clk", "pll_sys_pfd0_392m_clk",
 	"pll_enet_125m_clk", "pll_usb_main_clk", "pll_audio_main_clk",
 	"pll_video_main_clk", };
-- 
2.8.0

^ permalink raw reply related	[flat|nested] 6+ messages in thread