[PATCH v5 08/24] clk: mediatek: Add configurable enable control to mtk_pll_data

Weiyi Lu
2020-11-09T02:04:16Z

In all MediaTek PLL design, bit0 of CON0 register is always
the enable bit.
However, there's a special case of usbpll on MT8192.
The enable bit of usbpll is moved to bit2 of other register.
Add configurable en_reg and pll_en_bit for enable control or
default 0 where pll data are static variables.
Hence, CON0_BASE_EN could also be removed.
And there might have another special case on other chips,
the enable bit is still on CON0 register but not at bit0.

Signed-off-by: Weiyi Lu <weiyi.lu@mediatek.com>
---
drivers/clk/mediatek/clk-mtk.h | 2 ++
drivers/clk/mediatek/clk-pll.c | 15 ++++++++++-----
2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
index c3d6756..c580663 100644
--- a/drivers/clk/mediatek/clk-mtk.h
+++ b/drivers/clk/mediatek/clk-mtk.h
@@ -233,6 +233,8 @@ struct mtk_pll_data {
uint32_t pcw_chg_reg;
const struct mtk_pll_div_table *div_table;
const char *parent_name;
+ uint32_t en_reg;
+ uint8_t pll_en_bit; /* Assume 0, indicates BIT(0) by default */
};

void mtk_clk_register_plls(struct device_node *node,
diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
index 11ed5d1..7fb001a 100644
--- a/drivers/clk/mediatek/clk-pll.c
+++ b/drivers/clk/mediatek/clk-pll.c
@@ -44,6 +44,7 @@ struct mtk_clk_pll {
void __iomem *tuner_en_addr;
void __iomem *pcw_addr;
void __iomem *pcw_chg_addr;
+ void __iomem *en_addr;
const struct mtk_pll_data *data;
};

@@ -56,7 +57,7 @@ static int mtk_pll_is_prepared(struct clk_hw *hw)
{
struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);

- return (readl(pll->base_addr + REG_CON0) & CON0_BASE_EN) != 0;
+ return (readl(pll->en_addr) & BIT(pll->data->pll_en_bit)) != 0;
}

static unsigned long __mtk_pll_recalc_rate(struct mtk_clk_pll *pll, u32 fin,
@@ -248,8 +249,8 @@ static int mtk_pll_prepare(struct clk_hw *hw)
writel(r, pll->pwr_addr);
udelay(1);

- r = readl(pll->base_addr + REG_CON0) | CON0_BASE_EN;
- writel(r, pll->base_addr + REG_CON0);
+ r = readl(pll->en_addr) | BIT(pll->data->pll_en_bit);
+ writel(r, pll->en_addr);

div_en_mask = pll->data->en_mask & ~CON0_BASE_EN;
if (div_en_mask) {
@@ -290,8 +291,8 @@ static void mtk_pll_unprepare(struct clk_hw *hw)
writel(r, pll->base_addr + REG_CON0);
}

- r = readl(pll->base_addr + REG_CON0) & ~CON0_BASE_EN;
- writel(r, pll->base_addr + REG_CON0);
+ r = readl(pll->en_addr) & ~BIT(pll->data->pll_en_bit);
+ writel(r, pll->en_addr);

r = readl(pll->pwr_addr) | CON0_ISO_EN;
writel(r, pll->pwr_addr);
@@ -333,6 +334,10 @@ static struct clk *mtk_clk_register_pll(const struct mtk_pll_data *data,
pll->tuner_addr = base + data->tuner_reg;
if (data->tuner_en_reg)
pll->tuner_en_addr = base + data->tuner_en_reg;
+ if (data->en_reg)
+ pll->en_addr = base + data->en_reg;
+ else
+ pll->en_addr = pll->base_addr + REG_CON0;
pll->hw.init = &init;
pll->data = data;

--
1.8.1.1.dirty