Re: [PATCH] clk: imx6q: remove unsupported pll4_audio_div

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Hi Lucas,

On 3/11/19 4:37 AM, Lucas Stach wrote:
Hi Eric,

Am Sonntag, den 10.03.2019, 16:18 -0700 schrieb Eric Nelson:
The pll4_audio_div attempted to reflect one bit of a two-bit
divisor (AUDIO_DIV_LSB) in the CCM_ANALOG_MISC2 register.

Unfortunately, this divisor is non-functional at least on the
latest silicon revisions and has been removed from the reference
manual.

This is discussed in this NXP Community thread:

     https://community.nxp.com/thread/462806

Remove the definition of pll4_audio_div to reflect this and
reparent the ssi, cko1, and ESAI/ASRC/SPDIF clocks to the
pll4_post_div clock.

Signed-off-by: Eric Nelson <eric@xxxxxxxxxx>
---
  drivers/clk/imx/clk-imx6q.c               |   7 +-
  include/dt-bindings/clock/imx6qdl-clock.h | 127 +++++++++++++++---------------
  2 files changed, 66 insertions(+), 68 deletions(-)


<snip>

diff --git a/include/dt-bindings/clock/imx6qdl-clock.h b/include/dt-bindings/clock/imx6qdl-clock.h
index b3cef29..dea23a9 100644
--- a/include/dt-bindings/clock/imx6qdl-clock.h
+++ b/include/dt-bindings/clock/imx6qdl-clock.h
@@ -213,69 +213,68 @@
  #define IMX6QDL_CLK_CKO2			200
  #define IMX6QDL_CLK_CKO				201
  #define IMX6QDL_CLK_VDOA			202
-#define IMX6QDL_CLK_PLL4_AUDIO_DIV		203
-#define IMX6QDL_CLK_LVDS1_SEL			204

<snip>

+#define IMX6QDL_CLK_LVDS1_SEL			203
+#define IMX6QDL_CLK_LVDS2_SEL			204
+#define IMX6QDL_CLK_LVDS1_GATE			205

<snip>


You can not renumber the DT clock defines, as this breaks DT backward
compatibility. You can however remove IMX6QDL_CLK_PLL4_AUDIO_DIV and
leave a hole in the numbers, maybe with a comment about why it exists.


Okay. I wasn't aware of this requirement, and I'll send a V2.

It will also make the patch much smaller!



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