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

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Message-ID: <d60df94d-8f42-12eb-af55-2fc839c126bc@linaro.org>
Date:   Mon, 7 Nov 2016 13:53:19 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     gabriel.fernandez@...com, 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>,
        andrea.merello@...il.com
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        kernel@...inux.com, ludovic.barre@...com, olivier.bideau@...com,
        amelie.delaunay@...com
Subject: Re: [PATCH 1/6] clk: stm32f4: Add PLL_I2S & PLL_SAI for STM32F429/469
 boards

On 07/11/16 13:05, gabriel.fernandez@...com wrote:
> From: Gabriel Fernandez <gabriel.fernandez@...com>
>
> This patch introduces PLL_I2S and PLL_SAI.
> Vco clock of these PLLs can be modify by DT (only n multiplicator,
> m divider is still fixed by the boot-loader).
> Each PLL has 3 dividers. PLL should be off when we modify the rate.
>
> Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...com>
> ---
>  drivers/clk/clk-stm32f4.c | 371 ++++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 359 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
> index c2661e2..7641acd 100644
> --- a/drivers/clk/clk-stm32f4.c
> +++ b/drivers/clk/clk-stm32f4.c
> @@ -28,6 +28,7 @@
 > ...
> +static const struct clk_div_table pll_divp_table[] = {
> +	{ 0, 2 }, { 1, 4 }, { 2, 6 }, { 3, 8 },
> +};
> +
>  /*
>   * Decode current PLL state and (statically) model the state we inherit from
>   * the bootloader.
>   */

This comment isn't right. For a start the model is no longer static.


> @@ -615,18 +944,24 @@ struct stm32f4_clk_data {
>  	const struct stm32f4_gate_data *gates_data;
>  	const u64 *gates_map;
>  	int gates_num;
> +	const struct stm32f4_pll_data *pll_data;
> +	int pll_num;

pll_num is unused.


Daniel.