Quoting Murali Karicheri (2015-05-29 09:04:12)
> 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 <m-kariche...@ti.com>
Applied to clk-next.
Regards,
Mike
> ---
> .../devicetree/bindings/clock/keystone-pll.txt | 8 ++++----
> drivers/clk/keystone/pll.c | 20
> ++++++++++++++++++--
> 2 files changed, 22 insertions(+), 6 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/clock/keystone-pll.txt
> b/Documentation/devicetree/bindings/clock/keystone-pll.txt
> index 225990f..47570d2 100644
> --- a/Documentation/devicetree/bindings/clock/keystone-pll.txt
> +++ b/Documentation/devicetree/bindings/clock/keystone-pll.txt
> @@ -15,8 +15,8 @@ Required properties:
> - compatible : shall be "ti,keystone,main-pll-clock" or
> "ti,keystone,pll-clock"
> - clocks : parent clock phandle
> - reg - pll control0 and pll multipler registers
> -- reg-names : control and multiplier. The multiplier is applicable only for
> - main pll clock
> +- reg-names : control, multiplier and post-divider. The multiplier and
> + post-divider registers are applicable only for main pll clock
> - fixed-postdiv : fixed post divider value. If absent, use clkod register
> bits
> for postdiv
>
> @@ -25,8 +25,8 @@ Example:
> #clock-cells = <0>;
> compatible = "ti,keystone,main-pll-clock";
> clocks = <&refclksys>;
> - reg = <0x02620350 4>, <0x02310110 4>;
> - reg-names = "control", "multiplier";
> + reg = <0x02620350 4>, <0x02310110 4>, <0x02310108 4>;
> + reg-names = "control", "multiplier", "post-divider";
> fixed-postdiv = <2>;
> };
>
> 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;
> }
> }
> --
> 1.9.1
>
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