From 02fdfd708fd252a778709beb6c65d5e7360341ac Mon Sep 17 00:00:00 2001 From: Murali Karicheri Date: Fri, 29 May 2015 12:04:12 -0400 Subject: clk: keystone: add support for post divider register for main pll Main PLL controller has post divider bits in a separate register in pll controller. Use the value from this register instead of fixed divider when available. Signed-off-by: Murali Karicheri Signed-off-by: Michael Turquette --- drivers/clk/keystone/pll.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) (limited to 'drivers/clk/keystone') diff --git a/drivers/clk/keystone/pll.c b/drivers/clk/keystone/pll.c index 0dd8a4b..4a375ea 100644 --- a/drivers/clk/keystone/pll.c +++ b/drivers/clk/keystone/pll.c @@ -37,7 +37,8 @@ * Main PLL or any other PLLs in the device such as ARM PLL, DDR PLL * or PA PLL available on keystone2. These PLLs are controlled by * this register. Main PLL is controlled by a PLL controller. - * @pllm: PLL register map address + * @pllm: PLL register map address for multiplier bits + * @pllod: PLL register map address for post divider bits * @pll_ctl0: PLL controller map address * @pllm_lower_mask: multiplier lower mask * @pllm_upper_mask: multiplier upper mask @@ -53,6 +54,7 @@ struct clk_pll_data { u32 phy_pllm; u32 phy_pll_ctl0; void __iomem *pllm; + void __iomem *pllod; void __iomem *pll_ctl0; u32 pllm_lower_mask; u32 pllm_upper_mask; @@ -102,7 +104,11 @@ static unsigned long clk_pllclk_recalc(struct clk_hw *hw, /* read post divider from od bits*/ postdiv = ((val & pll_data->clkod_mask) >> pll_data->clkod_shift) + 1; - else + else if (pll_data->pllod) { + postdiv = readl(pll_data->pllod); + postdiv = ((postdiv & pll_data->clkod_mask) >> + pll_data->clkod_shift) + 1; + } else postdiv = pll_data->postdiv; rate /= (prediv + 1); @@ -172,12 +178,21 @@ static void __init _of_pll_clk_init(struct device_node *node, bool pllctrl) /* assume the PLL has output divider register bits */ pll_data->clkod_mask = CLKOD_MASK; pll_data->clkod_shift = CLKOD_SHIFT; + + /* + * Check if there is an post-divider register. If not + * assume od bits are part of control register. + */ + i = of_property_match_string(node, "reg-names", + "post-divider"); + pll_data->pllod = of_iomap(node, i); } i = of_property_match_string(node, "reg-names", "control"); pll_data->pll_ctl0 = of_iomap(node, i); if (!pll_data->pll_ctl0) { pr_err("%s: ioremap failed\n", __func__); + iounmap(pll_data->pllod); goto out; } @@ -193,6 +208,7 @@ static void __init _of_pll_clk_init(struct device_node *node, bool pllctrl) pll_data->pllm = of_iomap(node, i); if (!pll_data->pllm) { iounmap(pll_data->pll_ctl0); + iounmap(pll_data->pllod); goto out; } } -- cgit v1.1