Re: [PATCH 00/11] ARM: OMAP3: legacy clock data move under clk driver

[Tero Kristo <t-kristo@ti.com>]

On 01/08/2015 01:00 AM, Tony Lindgren wrote:
> * Tero Kristo <t-kristo@ti.com> [141216 08:22]:
>> Hi,
>>
>> These patches move the legacy clock data for omap3 under drivers/clk/ti.
>> After these patches are applied, it should be possible to get rid of
>> clk-private.h (long pending project for Mike.)
>>
>> Testing done (on top of 3.18-rc1):
>>
>> omap3-beagle: boot / suspend-resume (ret/off) / cpuidle (ret/off)
>> omap3-beagle-xm: boot upto fs mount (see note below)
>> sdp3430: boot
>> n900: boot
>>
>> Note: beagle-xm failed with FS mount on the board I have access to, but
>>        this happens with clean 3.18-rc1 and linux-next also at the moment.
>>        The board has probably corrupted filesystem image but I am unable
>>        to fix this atm (remote board.)
>>
>> Test branch:
>> tree: https://github.com/t-kristo/linux-pm.git
>> branch: 3.18-rc1-omap3-clk-rework
>
> Great, hopefully this will finally allow Mike to make the
> generic struct clk private to drivers/clk :)
>
> Seems to boot just fine based on a quick legacy booting test
> on n900.
>
> Mike, assuming no other issues, can you please apply these into a
> immutable branch against v3.19-rc1 that Paul and I can also merge
> in as needed?
>
> Please also feel free to add:
>
> Acked-by: Tony Lindgren <tony@atomide.com>
>

I just rebased these patches on top of 3.19-rc1, and noticed a problem 
with dpll5 on beagle-xm (basically a divide-by-zero error + locking 
issue during boot.) The extra diff at the end of this email fixes the 
problems, I will also send the updated two patches as v2. Updated branch 
available in my tree under name 3.19-rc1-omap3-clk-rework.

- Tero

---------------------

diff --git a/drivers/clk/ti/clk-3xxx-legacy.c 
b/drivers/clk/ti/clk-3xxx-legacy.c
index 81ad510..e0732a4 100644
--- a/drivers/clk/ti/clk-3xxx-legacy.c
+++ b/drivers/clk/ti/clk-3xxx-legacy.c
@@ -136,6 +136,7 @@ static struct ti_clk_dpll dpll3_ck_data = {
  	.idlest_mask = 0x1,
  	.auto_recal_bit = 0x3,
  	.max_divider = 0x80,
+	.min_divider = 0x1,
  	.recal_en_bit = 0x5,
  	.max_multiplier = 0x7ff,
  	.enable_mask = 0x7,
@@ -307,6 +308,7 @@ static struct ti_clk_dpll dpll4_ck_data = {
  	.idlest_mask = 0x2,
  	.auto_recal_bit = 0x13,
  	.max_divider = 0x80,
+	.min_divider = 0x1,
  	.recal_en_bit = 0x6,
  	.max_multiplier = 0x7ff,
  	.enable_mask = 0x70000,
@@ -507,6 +509,7 @@ static struct ti_clk_dpll dpll5_ck_data = {
  	.idlest_mask = 0x1,
  	.auto_recal_bit = 0x3,
  	.max_divider = 0x80,
+	.min_divider = 0x1,
  	.recal_en_bit = 0x19,
  	.max_multiplier = 0x7ff,
  	.enable_mask = 0x7,
@@ -1271,6 +1274,7 @@ static struct ti_clk_dpll dpll1_ck_data = {
  	.idlest_mask = 0x1,
  	.auto_recal_bit = 0x3,
  	.max_divider = 0x80,
+	.min_divider = 0x1,
  	.recal_en_bit = 0x7,
  	.max_multiplier = 0x7ff,
  	.enable_mask = 0x7,
@@ -2154,6 +2158,7 @@ static struct ti_clk_dpll dpll2_ck_data = {
  	.idlest_mask = 0x1,
  	.auto_recal_bit = 0x3,
  	.max_divider = 0x80,
+	.min_divider = 0x1,
  	.recal_en_bit = 0x8,
  	.max_multiplier = 0x7ff,
  	.enable_mask = 0x7,
@@ -2513,6 +2518,7 @@ static struct ti_clk_dpll dpll4_ck_omap36xx_data = {
  	.idlest_mask = 0x2,
  	.auto_recal_bit = 0x13,
  	.max_divider = 0x80,
+	.min_divider = 0x1,
  	.recal_en_bit = 0x6,
  	.max_multiplier = 0xfff,
  	.enable_mask = 0x70000,
diff --git a/drivers/clk/ti/clock.h b/drivers/clk/ti/clock.h
index 8d9c603..404158d 100644
--- a/drivers/clk/ti/clock.h
+++ b/drivers/clk/ti/clock.h
@@ -148,6 +148,7 @@ struct ti_clk_dpll {
  	u32 sddiv_mask;
  	u16 max_multiplier;
  	u16 max_divider;
+	u8 min_divider;
  	u8 auto_recal_bit;
  	u8 recal_en_bit;
  	u8 recal_st_bit;
diff --git a/drivers/clk/ti/dpll.c b/drivers/clk/ti/dpll.c
index 7d67639..47ebff7 100644
--- a/drivers/clk/ti/dpll.c
+++ b/drivers/clk/ti/dpll.c
@@ -243,6 +243,7 @@ struct clk *ti_clk_register_dpll(struct ti_clk *setup)
  	dd->sddiv_mask = dpll->sddiv_mask;
  	dd->dco_mask = dpll->dco_mask;
  	dd->max_divider = dpll->max_divider;
+	dd->min_divider = dpll->min_divider;
  	dd->max_multiplier = dpll->max_multiplier;
  	dd->auto_recal_bit = dpll->auto_recal_bit;
  	dd->recal_en_bit = dpll->recal_en_bit;