diff mbox

[RESEND,1/2] ARM: dts: dra7: Fix clock data for gmac_gmii_ref_clk_div

Message ID 20160830145801.10364-1-grygorii.strashko@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Grygorii Strashko Aug. 30, 2016, 2:58 p.m. UTC 
From: "J.D. Schroeder" <jay.schroeder@garmin.com>

This commit fixes the clock data inside the DRA7xx clocks device tree
structure for the gmac_gmii_ref_clk_div clock. This clock is actually
the GMAC_MAIN_CLK and has nothing to do with the register at address
0x4a0093d0. If CLKSEL_REF bit 24 inside of CM_GMAC_GMAC_CLKCTRL, is
set to 1 in order to use the GMAC_RMII_CLK instead of the
GMAC_RMII_HS_CLK, the kernel generates a clock divider warning:
    WARNING: CPU: 0 PID: 0 at drivers/clk/clk-divider.c:129 clk_divider_recalc_rate+0xa8/0xe0()
    gmac_gmii_ref_clk_div: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set

By properly configuring the gmac_gmii_ref_clk_div (GMAC_MAIN_CLK) to
have the parent of dpll_gmac_m2_ck always divided by 2 the warning is
resolved and the clock tree is fixed up.

Additionally, a new clock called rmii_50mhz_clk_mux is defined that
does utilize CM_GMAC_GMAC_CLKCTRL[24] CLKSEL_REF to configure the
source clock for the RMII_50MHZ_CLK.

Cc: Tero Kristo <t-kristo@ti.com>
Cc: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: J.D. Schroeder <jay.schroeder@garmin.com>
Reviewed-by: Trenton Andres <trenton.andres@garmin.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
Hi Tony,

Originally this patch was posted (and acked) here
https://lkml.org/lkml/2016/4/27/272, 
but it, unfortunatelly, has never been merged. 
So re-send + minor subj change.

 arch/arm/boot/dts/dra7xx-clocks.dtsi | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

Comments

Tony Lindgren Aug. 30, 2016, 6:41 p.m. UTC | #1 
* Grygorii Strashko <grygorii.strashko@ti.com> [160830 07:58]:
> 
> Originally this patch was posted (and acked) here
> https://lkml.org/lkml/2016/4/27/272, 
> but it, unfortunatelly, has never been merged. 
> So re-send + minor subj change.

OK yeah sorry about that. And thanks for the resend. If some patches
have pending discussion as I tend to tag threads that have pending
discussion as read and then forget them. And I miss patches in other
ways too..

Tero, care to take a look and ack?

Regards,

Tony
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Tero Kristo Aug. 31, 2016, 6:08 a.m. UTC | #2 
On 30/08/16 21:41, Tony Lindgren wrote:
> * Grygorii Strashko <grygorii.strashko@ti.com> [160830 07:58]:
>>
>> Originally this patch was posted (and acked) here
>> https://lkml.org/lkml/2016/4/27/272,
>> but it, unfortunatelly, has never been merged.
>> So re-send + minor subj change.
>
> OK yeah sorry about that. And thanks for the resend. If some patches
> have pending discussion as I tend to tag threads that have pending
> discussion as read and then forget them. And I miss patches in other
> ways too..
>
> Tero, care to take a look and ack?

For both patches:

Acked-by: Tero Kristo <t-kristo@ti.com>

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Tony Lindgren Aug. 31, 2016, 2:39 p.m. UTC | #3 
* Tero Kristo <t-kristo@ti.com> [160830 23:09]:
> On 30/08/16 21:41, Tony Lindgren wrote:
> > * Grygorii Strashko <grygorii.strashko@ti.com> [160830 07:58]:
> > > 
> > > Originally this patch was posted (and acked) here
> > > https://lkml.org/lkml/2016/4/27/272,
> > > but it, unfortunatelly, has never been merged.
> > > So re-send + minor subj change.
> > 
> > OK yeah sorry about that. And thanks for the resend. If some patches
> > have pending discussion as I tend to tag threads that have pending
> > discussion as read and then forget them. And I miss patches in other
> > ways too..
> > 
> > Tero, care to take a look and ack?
> 
> For both patches:
> 
> Acked-by: Tero Kristo <t-kristo@ti.com>

Thanks applying both into omap-for-v4.9/dt as the Ethernet works
currently.

Regards,

Tony
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Tero Kristo Aug. 31, 2016, 5:34 p.m. UTC | #4 
On 31/08/16 17:39, Tony Lindgren wrote:
> * Tero Kristo <t-kristo@ti.com> [160830 23:09]:
>> On 30/08/16 21:41, Tony Lindgren wrote:
>>> * Grygorii Strashko <grygorii.strashko@ti.com> [160830 07:58]:
>>>>
>>>> Originally this patch was posted (and acked) here
>>>> https://lkml.org/lkml/2016/4/27/272,
>>>> but it, unfortunatelly, has never been merged.
>>>> So re-send + minor subj change.
>>>
>>> OK yeah sorry about that. And thanks for the resend. If some patches
>>> have pending discussion as I tend to tag threads that have pending
>>> discussion as read and then forget them. And I miss patches in other
>>> ways too..
>>>
>>> Tero, care to take a look and ack?
>>
>> For both patches:
>>
>> Acked-by: Tero Kristo <t-kristo@ti.com>
>
> Thanks applying both into omap-for-v4.9/dt as the Ethernet works
> currently.
>
> Regards,
>
> Tony
>

Yea I think the ethernet clock rate happens to be the same in the 
existing setup, just the hierarchy is wrong. That is at least what I saw 
with quick testing.

-Tero
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diff mbox

Patch

diff --git a/arch/arm/boot/dts/dra7xx-clocks.dtsi b/arch/arm/boot/dts/dra7xx-clocks.dtsi
index 8378b44..3f0c61d 100644
--- a/arch/arm/boot/dts/dra7xx-clocks.dtsi
+++ b/arch/arm/boot/dts/dra7xx-clocks.dtsi
@@ -1718,13 +1718,20 @@ 
 		reg = <0x0c00>;
 	};
 
-	gmac_gmii_ref_clk_div: gmac_gmii_ref_clk_div@13d0 {
+	rmii_50mhz_clk_mux: rmii_50mhz_clk_mux@13d0 {
 		#clock-cells = <0>;
-		compatible = "ti,divider-clock";
-		clocks = <&dpll_gmac_m2_ck>;
+		compatible = "ti,mux-clock";
+		clocks = <&dpll_gmac_h11x2_ck>, <&rmii_clk_ck>;
 		ti,bit-shift = <24>;
 		reg = <0x13d0>;
-		ti,dividers = <2>;
+	};
+
+	gmac_gmii_ref_clk_div: gmac_gmii_ref_clk_div {
+		#clock-cells = <0>;
+		compatible = "fixed-factor-clock";
+		clocks = <&dpll_gmac_m2_ck>;
+		clock-mult = <1>;
+		clock-div = <2>;
 	};
 
 	gmac_rft_clk_mux: gmac_rft_clk_mux@13d0 {