Re: [PATCH v4 08/13] clk: imx: Update pllv3 to support i.MXRT1170
From: Jesse Taube
Date: Mon Jun 27 2022 - 12:11:42 EST
On 6/27/22 09:32, Abel Vesa wrote:
On 22-06-26 02:45:18, Jesse Taube wrote:
The i.MXRT1170 has a pll that has the multiplier bits inverted and
cannot be changed add IMX_PLLV3_GENERICV2.
The i.MXRT1170 also has the lock bit moved as well as the
power bit inverted the power bit also is in different locations on each
pll control register.
Signed-off-by: Jesse Taube <Mr.Bossman075@xxxxxxxxx>
---
V1 -> V2:
- Nothing done
V2 -> V3:
- Nothing done
V3 -> V4:
- Nothing done
---
drivers/clk/imx/clk-pllv3.c | 57 +++++++++++++++++++++++++++++++++++--
drivers/clk/imx/clk.h | 4 +++
2 files changed, 59 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/imx/clk-pllv3.c b/drivers/clk/imx/clk-pllv3.c
index eea32f87c60a..740412ea2f7e 100644
--- a/drivers/clk/imx/clk-pllv3.c
+++ b/drivers/clk/imx/clk-pllv3.c
@@ -23,6 +23,7 @@
#define BM_PLL_POWER (0x1 << 12)
#define BM_PLL_LOCK (0x1 << 31)
+#define BM_PLL_LOCK_V2 (0x1 << 29)
#define IMX7_ENET_PLL_POWER (0x1 << 5)
#define IMX7_DDR_PLL_POWER (0x1 << 20)
@@ -34,6 +35,7 @@
* @base: base address of PLL registers
* @power_bit: pll power bit mask
* @powerup_set: set power_bit to power up the PLL
+ * @lock_bit: pll lock bit mask
* @div_mask: mask of divider bits
* @div_shift: shift of divider bits
* @ref_clock: reference clock rate
@@ -48,6 +50,7 @@ struct clk_pllv3 {
void __iomem *base;
u32 power_bit;
bool powerup_set;
+ u32 lock_bit;
u32 div_mask;
u32 div_shift;
unsigned long ref_clock;
@@ -65,7 +68,7 @@ static int clk_pllv3_wait_lock(struct clk_pllv3 *pll)
if ((pll->powerup_set && !val) || (!pll->powerup_set && val))
return 0;
- return readl_relaxed_poll_timeout(pll->base, val, val & BM_PLL_LOCK,
+ return readl_relaxed_poll_timeout(pll->base, val, val & pll->lock_bit,
500, PLL_LOCK_TIMEOUT);
}
@@ -101,7 +104,7 @@ static int clk_pllv3_is_prepared(struct clk_hw *hw)
{
struct clk_pllv3 *pll = to_clk_pllv3(hw);
- if (readl_relaxed(pll->base) & BM_PLL_LOCK)
+ if (readl_relaxed(pll->base) & pll->lock_bit)
return 1;
return 0;
@@ -155,6 +158,39 @@ static const struct clk_ops clk_pllv3_ops = {
.set_rate = clk_pllv3_set_rate,
};
+static int clk_pllv3_genericv2_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+ u32 val, div;
+
+ div = (readl_relaxed(pll->base) >> pll->div_shift) & pll->div_mask;
+ val = (div == 0) ? parent_rate * 22 : parent_rate * 20;
+
+ if (rate == val)
+ return 0;
+
+ return -EINVAL;
+}
+
+static unsigned long clk_pllv3_genericv2_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+ u32 div = (readl_relaxed(pll->base) >> pll->div_shift) & pll->div_mask;
+
+ return (div == 0) ? parent_rate * 22 : parent_rate * 20;
+}
+
+static const struct clk_ops clk_pllv3_genericv2_ops = {
+ .prepare = clk_pllv3_prepare,
+ .unprepare = clk_pllv3_unprepare,
+ .is_prepared = clk_pllv3_is_prepared,
+ .recalc_rate = clk_pllv3_genericv2_recalc_rate,
+ .round_rate = clk_pllv3_round_rate,
+ .set_rate = clk_pllv3_genericv2_set_rate,
+};
+
static unsigned long clk_pllv3_sys_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
@@ -407,6 +443,13 @@ static const struct clk_ops clk_pllv3_enet_ops = {
.recalc_rate = clk_pllv3_enet_recalc_rate,
};
+void imx_clk_hw_pll3_powerbit(struct clk_hw *hw, u8 shift)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+
+ pll->power_bit = shift;
+}
+
I can see why you need this, but I think the approach is not quite
right.
I wasn't sure if modifying the function like that was appropriate for
this, but sense it is I will do like you said.
I suggest we rename the imx_clk_hw_pllv3 to __imx_clk_hw_pllv3 and add
the power_bit parameter to it (and set it accordingly inside).
Then we should do the following in imx/clk.h:
#define imx_clk_hw_pllv3(name, parent_names, num_parents, parent, \
bypass1, bypass2, base, flags) \
__imx_clk_hw_pllv3(name, parent_names, num_parents, parent, \
bypass1, bypass2, base, flags, BM_PLL_POWER)
One problem BM_PLL_POWER will have to be in imx/clk.h, but then it will
be the only macro like it in the file, is line 9 ok for it.
I could also make a function instead of a macro.
thanks,
Jesse Taube
And then, the i.MXRT1170 can use the __imx_clk_hw_pllv3 and pass the
right power_bit shift.
struct clk_hw *imx_clk_hw_pllv3(enum imx_pllv3_type type, const char *name,
const char *parent_name, void __iomem *base,
u32 div_mask)
@@ -422,10 +465,20 @@ struct clk_hw *imx_clk_hw_pllv3(enum imx_pllv3_type type, const char *name,
return ERR_PTR(-ENOMEM);
pll->power_bit = BM_PLL_POWER;
+ pll->lock_bit = BM_PLL_LOCK;
pll->num_offset = PLL_NUM_OFFSET;
pll->denom_offset = PLL_DENOM_OFFSET;
switch (type) {
+ case IMX_PLLV3_GENERICV2:
+ pll->lock_bit = BM_PLL_LOCK_V2;
+ pll->powerup_set = true;
+ ops = &clk_pllv3_genericv2_ops;
+ break;
+ case IMX_PLLV3_SYSV2:
+ pll->lock_bit = BM_PLL_LOCK_V2;
+ pll->powerup_set = true;
+ fallthrough;
case IMX_PLLV3_SYS:
ops = &clk_pllv3_sys_ops;
break;
diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h
index 5061a06468df..31e017248602 100644
--- a/drivers/clk/imx/clk.h
+++ b/drivers/clk/imx/clk.h
@@ -242,6 +242,8 @@ struct clk_hw *imx_clk_hw_sscg_pll(const char *name,
enum imx_pllv3_type {
IMX_PLLV3_GENERIC,
+ IMX_PLLV3_GENERICV2,
+ IMX_PLLV3_SYSV2,
IMX_PLLV3_SYS,
IMX_PLLV3_USB,
IMX_PLLV3_USB_VF610,
@@ -253,6 +255,8 @@ enum imx_pllv3_type {
IMX_PLLV3_AV_IMX7,
};
+void imx_clk_hw_pll3_powerbit(struct clk_hw *hw, u8 shift);
+
struct clk_hw *imx_clk_hw_pllv3(enum imx_pllv3_type type, const char *name,
const char *parent_name, void __iomem *base, u32 div_mask);
--
2.36.1