diff options
author | Giulio Benetti <giulio.benetti@benettiengineering.com> | 2020-01-10 15:46:55 +0100 |
---|---|---|
committer | Stefano Babic <sbabic@denx.de> | 2020-01-14 22:53:59 +0100 |
commit | f4b7094250fb92d4b044674d812a71bb59cd3c11 (patch) | |
tree | 70a5baa30ef473cd93588be23cf3c8a602ed11e5 | |
parent | 4abd8076c8875247f391d11968a436ca65c8f5a9 (diff) |
clk: imx: pllv3: add enable() support
Before set_rate() pllv3 needs enable() to power the pll up.
Add enable() taking into account different power_bit and
different powerup_set, because some pll needs its power_bit to be
set or reset to be powered on.
Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
-rw-r--r-- | drivers/clk/imx/clk-pllv3.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk-pllv3.c b/drivers/clk/imx/clk-pllv3.c index 02c75c37ea..d8cbe3dd4e 100644 --- a/drivers/clk/imx/clk-pllv3.c +++ b/drivers/clk/imx/clk-pllv3.c @@ -16,9 +16,13 @@ #define UBOOT_DM_CLK_IMX_PLLV3_GENERIC "imx_clk_pllv3_generic" #define UBOOT_DM_CLK_IMX_PLLV3_USB "imx_clk_pllv3_usb" +#define BM_PLL_POWER (0x1 << 12) + struct clk_pllv3 { struct clk clk; void __iomem *base; + u32 power_bit; + bool powerup_set; u32 div_mask; u32 div_shift; }; @@ -35,8 +39,24 @@ static ulong clk_pllv3_generic_get_rate(struct clk *clk) return (div == 1) ? parent_rate * 22 : parent_rate * 20; } +static int clk_pllv3_generic_enable(struct clk *clk) +{ + struct clk_pllv3 *pll = to_clk_pllv3(clk); + u32 val; + + val = readl(pll->base); + if (pll->powerup_set) + val |= pll->power_bit; + else + val &= ~pll->power_bit; + writel(val, pll->base); + + return 0; +} + static const struct clk_ops clk_pllv3_generic_ops = { .get_rate = clk_pllv3_generic_get_rate, + .enable = clk_pllv3_generic_enable, }; struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name, @@ -52,14 +72,18 @@ struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name, if (!pll) return ERR_PTR(-ENOMEM); + pll->power_bit = BM_PLL_POWER; + switch (type) { case IMX_PLLV3_GENERIC: drv_name = UBOOT_DM_CLK_IMX_PLLV3_GENERIC; pll->div_shift = 0; + pll->powerup_set = false; break; case IMX_PLLV3_USB: drv_name = UBOOT_DM_CLK_IMX_PLLV3_USB; pll->div_shift = 1; + pll->powerup_set = true; break; default: kfree(pll); |