linux-kernel - Re: [PATCH] clk: mvebu: armada-38x: add support for missing clocks

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Date:   Thu, 08 Mar 2018 14:22:01 +0100
From:   Gregory CLEMENT <gregory.clement@...tlin.com>
To:     Richard Genoud <richard.genoud@...il.com>
Cc:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Gregory CLEMENT <gregory.clement@...e-electrons.com>,
        Ralph Sennhauser <ralph.sennhauser@...il.com>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: mvebu: armada-38x: add support for missing clocks

Hi Richard,
 
 On jeu., mars 08 2018, Richard Genoud <richard.genoud@...il.com> wrote:

> Clearfog boards can come with a CPU clocked at 1600MHz (commercial)
> or 1333MHz (industrial).
>
> They have also some dip-switches to select a different clock (666, 800,
> 1066, 1200).

The patch looks goo and it will also be usefull for any other board
using these frequencies, thanks for this. I have only one small comment,
see below.


>
> The funny thing is that the recovery button is on the MPP34 fq selector.
> So, when booting an industrial board with this button down, the frequency
> 666MHz is selected (and the kernel didn't boot).
>
> This patch add all the missing clocks.
>
> The only mode I didn't test is 2GHz (uboot found 4294MHz instead :/ ).
>
> Signed-off-by: Richard Genoud <richard.genoud@...il.com>
> ---
>  drivers/clk/mvebu/armada-38x.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/clk/mvebu/armada-38x.c b/drivers/clk/mvebu/armada-38x.c
> index 394aa6f03f01..9ff4ea63932d 100644
> --- a/drivers/clk/mvebu/armada-38x.c
> +++ b/drivers/clk/mvebu/armada-38x.c
> @@ -46,11 +46,11 @@ static u32 __init armada_38x_get_tclk_freq(void __iomem *sar)
>  }
>  
>  static const u32 armada_38x_cpu_frequencies[] __initconst = {
> -	0, 0, 0, 0,
> -	1066 * 1000 * 1000, 0, 0, 0,
> +	666 * 1000 * 1000,  0, 800 * 1000 * 1000, 0,
> +	1066 * 1000 * 1000, 0, 1200 * 1000 * 1000, 0,
>  	1332 * 1000 * 1000, 0, 0, 0,
>  	1600 * 1000 * 1000, 0, 0, 0,
> -	1866 * 1000 * 1000,
> +	1866 * 1000 * 1000, 0, 0, 2000 * 1000 * 1000,

Maybe you could add a comment here to say that the 2GHz mode didn't have
been tested.

Thanks,
Gregory


>  };
>  
>  static u32 __init armada_38x_get_cpu_freq(void __iomem *sar)
> @@ -76,11 +76,11 @@ static const struct coreclk_ratio armada_38x_coreclk_ratios[] __initconst = {
>  };
>  
>  static const int armada_38x_cpu_l2_ratios[32][2] __initconst = {
> -	{0, 1}, {0, 1}, {0, 1}, {0, 1},
> -	{1, 2}, {0, 1}, {0, 1}, {0, 1},
> -	{1, 2}, {0, 1}, {0, 1}, {0, 1},
> +	{1, 2}, {0, 1}, {1, 2}, {0, 1},
> +	{1, 2}, {0, 1}, {1, 2}, {0, 1},
>  	{1, 2}, {0, 1}, {0, 1}, {0, 1},
>  	{1, 2}, {0, 1}, {0, 1}, {0, 1},
> +	{1, 2}, {0, 1}, {0, 1}, {1, 2},
>  	{0, 1}, {0, 1}, {0, 1}, {0, 1},
>  	{0, 1}, {0, 1}, {0, 1}, {0, 1},
>  	{0, 1}, {0, 1}, {0, 1}, {0, 1},
> @@ -91,7 +91,7 @@ static const int armada_38x_cpu_ddr_ratios[32][2] __initconst = {
>  	{1, 2}, {0, 1}, {0, 1}, {0, 1},
>  	{1, 2}, {0, 1}, {0, 1}, {0, 1},
>  	{1, 2}, {0, 1}, {0, 1}, {0, 1},
> -	{1, 2}, {0, 1}, {0, 1}, {0, 1},
> +	{1, 2}, {0, 1}, {0, 1}, {7, 15},
>  	{0, 1}, {0, 1}, {0, 1}, {0, 1},
>  	{0, 1}, {0, 1}, {0, 1}, {0, 1},
>  	{0, 1}, {0, 1}, {0, 1}, {0, 1},

-- 
Gregory Clement, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
http://bootlin.com