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Message-ID: <YrmxdaSqHnEg28uG@linaro.org>
Date: Mon, 27 Jun 2022 16:32:37 +0300
From: Abel Vesa <abel.vesa@...aro.org>
To: Jesse Taube <mr.bossman075@...il.com>
Cc: linux-imx@....com, robh+dt@...nel.org, mturquette@...libre.com,
sboyd@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
kernel@...gutronix.de, festevam@...il.com, aisheng.dong@....com,
stefan@...er.ch, linus.walleij@...aro.org,
daniel.lezcano@...aro.org, tglx@...utronix.de, olof@...om.net,
linux@...linux.org.uk, abel.vesa@....com, dev@...xeye.de,
marcel.ziswiler@...adex.com, tharvey@...eworks.com,
leoyang.li@....com, sebastian.reichel@...labora.com,
cniedermaier@...electronics.com, clin@...e.com,
giulio.benetti@...ettiengineering.com, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v4 08/13] clk: imx: Update pllv3 to support i.MXRT1170
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@...il.com>
> ---
> 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 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)
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
>
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