linux-kernel - Re: [PATCH 1/6] clk: stm32f4: Add PLL_I2S & PLL

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Date:   Mon, 7 Nov 2016 15:57:05 +0100
From:   Radosław Pietrzyk <radoslaw.pietrzyk@...il.com>
To:     Gabriel FERNANDEZ <gabriel.fernandez@...com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Nicolas Pitre <nico@...aro.org>, Arnd Bergmann <arnd@...db.de>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Andrea Merello <andrea.merello@...il.com>,
        devicetree@...r.kernel.org, amelie.delaunay@...com,
        kernel@...inux.com, olivier.bideau@...com,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        ludovic.barre@...com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/6] clk: stm32f4: Add PLL_I2S & PLL_SAI for STM32F429/469 boards

> +static struct clk_hw *clk_register_pll_div(const char *name,
> +               const char *parent_name, unsigned long flags,
> +               void __iomem *reg, u8 shift, u8 width,
> +               u8 clk_divider_flags, const struct clk_div_table *table,
> +               struct clk_hw *pll_hw, spinlock_t *lock)
> +{
> +       struct stm32f4_pll_div *pll_div;
> +       struct clk_hw *hw;
> +       struct clk_init_data init;
> +       int ret;
> +
> +       /* allocate the divider */
> +       pll_div = kzalloc(sizeof(*pll_div), GFP_KERNEL);
> +       if (!pll_div)
> +               return ERR_PTR(-ENOMEM);
> +
> +       init.name = name;
> +       init.ops = &stm32f4_pll_div_ops;
> +       init.flags = flags;
Maybe it's worth to have CLK_SET_RATE_PARENT here and the VCO clock
should have CLK_SET_RATE_GATE flag and we can get rid of custom
divider ops.


> -static void stm32f4_rcc_register_pll(const char *hse_clk, const char *hsi_clk)
> +
> +static struct clk_hw *stm32f4_rcc_register_pll(const char *pllsrc,
> +               const struct stm32f4_pll_data *data,  spinlock_t *lock)
>  {
> -       unsigned long pllcfgr = readl(base + STM32F4_RCC_PLLCFGR);
> +       struct stm32f4_pll *pll;
> +       struct clk_init_data init = { NULL };
> +       void __iomem *reg;
> +       struct clk_hw *pll_hw;
> +       int ret;
> +
> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> +       if (!pll)
> +               return ERR_PTR(-ENOMEM);
> +
> +       init.name = data->vco_name;
> +       init.ops = &stm32f4_pll_gate_ops;
> +       init.flags = CLK_IGNORE_UNUSED;
CLK_SET_RATE_GATE here

Moreover why not having VCO as a composite clock from gate and mult ?

According to docs SAI VCO (don't know about I2S ) must be within
certain range so clk_set_rate_range should be somewhere.