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Date:	Thu, 19 Jun 2014 12:07:48 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Mike Turquette <mturquette@...aro.org>,
	Emilio Lopez <emilio@...pez.com.ar>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-serial@...r.kernel.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Luc Verhaegen <libv@...net.be>
Subject: Re: [PATCH v2 11/20] clk: sunxi: Add A23 clocks support

On Wed, Jun 18, 2014 at 6:16 PM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> On Tue, Jun 17, 2014 at 10:52:48PM +0800, Chen-Yu Tsai wrote:
>> The clock control unit on the A23 is similar to the one found on the A31.
>>
>> The AHB1, APB1, APB2 gates on the A23 are almost identical to the ones
>> on the A31, but some outputs are missing.
>>
>> The main CPU PLL (PLL1) however is like that on older Allwinner SoCs, such
>> as the A10 or A20, but the N factor starts from 1 instead of 0.
>>
>> This patch adds support for PLL1 and all the basic clock gates.
>>
>> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
>
> Except for the minor comment below, you have my
>
> Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
>
>> ---
>>  Documentation/devicetree/bindings/clock/sunxi.txt |   5 +
>>  drivers/clk/sunxi/clk-sunxi.c                     | 115 ++++++++++++++++++++++
>>  2 files changed, 120 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
>> index 7b2ba41..af9e47d 100644
>> --- a/Documentation/devicetree/bindings/clock/sunxi.txt
>> +++ b/Documentation/devicetree/bindings/clock/sunxi.txt
>> @@ -9,11 +9,13 @@ Required properties:
>>       "allwinner,sun4i-a10-osc-clk" - for a gatable oscillator
>>       "allwinner,sun4i-a10-pll1-clk" - for the main PLL clock and PLL4
>>       "allwinner,sun6i-a31-pll1-clk" - for the main PLL clock on A31
>> +     "allwinner,sun8i-a23-pll1-clk" - for the main PLL clock on A23
>>       "allwinner,sun4i-a10-pll5-clk" - for the PLL5 clock
>>       "allwinner,sun4i-a10-pll6-clk" - for the PLL6 clock
>>       "allwinner,sun6i-a31-pll6-clk" - for the PLL6 clock on A31
>>       "allwinner,sun4i-a10-cpu-clk" - for the CPU multiplexer clock
>>       "allwinner,sun4i-a10-axi-clk" - for the AXI clock
>> +     "allwinner,sun8i-a23-axi-clk" - for the AXI clock on A23
>>       "allwinner,sun4i-a10-axi-gates-clk" - for the AXI gates
>>       "allwinner,sun4i-a10-ahb-clk" - for the AHB clock
>>       "allwinner,sun4i-a10-ahb-gates-clk" - for the AHB gates on A10
>> @@ -23,6 +25,7 @@ Required properties:
>>       "allwinner,sun6i-a31-ar100-clk" - for the AR100 on A31
>>       "allwinner,sun6i-a31-ahb1-mux-clk" - for the AHB1 multiplexer on A31
>>       "allwinner,sun6i-a31-ahb1-gates-clk" - for the AHB1 gates on A31
>> +     "allwinner,sun8i-a23-ahb1-gates-clk" - for the AHB1 gates on A23
>>       "allwinner,sun4i-a10-apb0-clk" - for the APB0 clock
>>       "allwinner,sun6i-a31-apb0-clk" - for the APB0 clock on A31
>>       "allwinner,sun4i-a10-apb0-gates-clk" - for the APB0 gates on A10
>> @@ -37,8 +40,10 @@ Required properties:
>>       "allwinner,sun5i-a10s-apb1-gates-clk" - for the APB1 gates on A10s
>>       "allwinner,sun6i-a31-apb1-gates-clk" - for the APB1 gates on A31
>>       "allwinner,sun7i-a20-apb1-gates-clk" - for the APB1 gates on A20
>> +     "allwinner,sun8i-a23-apb1-gates-clk" - for the APB1 gates on A23
>>       "allwinner,sun6i-a31-apb2-div-clk" - for the APB2 gates on A31
>>       "allwinner,sun6i-a31-apb2-gates-clk" - for the APB2 gates on A31
>> +     "allwinner,sun8i-a23-apb2-gates-clk" - for the APB2 gates on A23
>>       "allwinner,sun4i-a10-mod0-clk" - for the module 0 family of clocks
>>       "allwinner,sun6i-a31-mbus-clk" - for the MBUS clocks on A31 / A23
>>       "allwinner,sun7i-a20-out-clk" - for the external output clocks
>> diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
>> index 7e2f015..f418392 100644
>> --- a/drivers/clk/sunxi/clk-sunxi.c
>> +++ b/drivers/clk/sunxi/clk-sunxi.c
>> @@ -164,6 +164,54 @@ static void sun6i_a31_get_pll1_factors(u32 *freq, u32 parent_rate,
>>  }
>>
>>  /**
>> + * sun8i_a23_get_pll1_factors() - calculates n, k, m, p factors for PLL1
>> + * PLL1 rate is calculated as follows
>> + * rate = (parent_rate * (n + 1) * (k + 1) >> p) / (m + 1);
>> + * parent_rate is always 24Mhz
>> + */
>> +
>> +static void sun8i_a23_get_pll1_factors(u32 *freq, u32 parent_rate,
>> +                                u8 *n, u8 *k, u8 *m, u8 *p)
>> +{
>> +     u8 div;
>> +
>> +     /* Normalize value to a 6M multiple */
>> +     div = *freq / 6000000;
>> +     *freq = 6000000 * div;
>> +
>> +     /* we were called to round the frequency, we can now return */
>> +     if (n == NULL)
>> +             return;
>> +
>> +     /* m is always zero for pll1 */
>> +     *m = 0;
>> +
>> +     /* k is 1 only on these cases */
>> +     if (*freq >= 768000000 || *freq == 42000000 || *freq == 54000000)
>> +             *k = 1;
>> +     else
>> +             *k = 0;
>> +
>> +     /* p will be 2 for divs under 20 and odd divs under 32 */
>> +     if (div < 20 || (div < 32 && (div & 1)))
>> +             *p = 2;
>> +
>> +     /* p will be 1 for even divs under 32, divs under 40 and odd pairs
>> +      * of divs between 40-62 */
>> +     else if (div < 40 || (div < 64 && (div & 2)))
>> +             *p = 1;
>> +
>> +     /* any other entries have p = 0 */
>> +     else
>> +             *p = 0;
>> +
>> +     /* calculate a suitable n based on k and p */
>> +     div <<= *p;
>> +     div /= (*k + 1);
>> +     *n = div / 4 - 1;
>> +}
>> +
>> +/**
>>   * sun4i_get_pll5_factors() - calculates n, k factors for PLL5
>>   * PLL5 rate is calculated as follows
>>   * rate = parent_rate * n * (k + 1)
>> @@ -448,6 +496,18 @@ static struct clk_factors_config sun6i_a31_pll1_config = {
>>       .n_from_one = 1,
>>  };
>>
>> +static struct clk_factors_config sun8i_a23_pll1_config = {
>> +     .nshift = 8,
>> +     .nwidth = 5,
>> +     .kshift = 4,
>> +     .kwidth = 2,
>> +     .mshift = 0,
>> +     .mwidth = 2,
>> +     .pshift = 16,
>> +     .pwidth = 2,
>> +     .n_from_one = 1,
>> +};
>> +
>>  static struct clk_factors_config sun4i_pll5_config = {
>>       .nshift = 8,
>>       .nwidth = 5,
>> @@ -503,6 +563,12 @@ static const struct factors_data sun6i_a31_pll1_data __initconst = {
>>       .getter = sun6i_a31_get_pll1_factors,
>>  };
>>
>> +static const struct factors_data sun8i_a23_pll1_data __initconst = {
>> +     .enable = 31,
>> +     .table = &sun8i_a23_pll1_config,
>> +     .getter = sun8i_a23_get_pll1_factors,
>> +};
>> +
>>  static const struct factors_data sun7i_a20_pll4_data __initconst = {
>>       .enable = 31,
>>       .table = &sun4i_pll5_config,
>> @@ -712,6 +778,25 @@ static const struct div_data sun4i_axi_data __initconst = {
>>       .width  = 2,
>>  };
>>
>> +static const struct clk_div_table sun8i_a23_axi_table[] __initconst = {
>> +     { .val = 0, .div = 1 },
>> +     { .val = 1, .div = 2 },
>> +     { .val = 2, .div = 3 },
>> +     { .val = 3, .div = 4 },
>> +     { .val = 4, .div = 4 },
>> +     { .val = 5, .div = 4 },
>> +     { .val = 6, .div = 4 },
>> +     { .val = 7, .div = 4 },
>> +     { } /* sentinel */
>> +};
>> +
>> +static const struct div_data sun8i_a23_axi_data __initconst = {
>> +     .shift  = 0,
>> +     .pow    = 0,
>> +     .width  = 8,
>> +     .table  = sun8i_a23_axi_table,
>> +};
>> +
>>  static const struct div_data sun4i_ahb_data __initconst = {
>>       .shift  = 4,
>>       .pow    = 1,
>> @@ -844,6 +929,10 @@ static const struct gates_data sun7i_a20_ahb_gates_data __initconst = {
>>       .mask = { 0x12f77fff, 0x16ff3f },
>>  };
>>
>> +static const struct gates_data sun8i_a23_ahb1_gates_data __initconst = {
>> +     .mask = {0x25386742, 0x2505111},
>> +};
>> +
>>  static const struct gates_data sun4i_apb0_gates_data __initconst = {
>>       .mask = {0x4EF},
>>  };
>> @@ -876,6 +965,10 @@ static const struct gates_data sun6i_a31_apb1_gates_data __initconst = {
>>       .mask = {0x3031},
>>  };
>>
>> +static const struct gates_data sun8i_a23_apb1_gates_data __initconst = {
>> +     .mask = {0x3021},
>> +};
>> +
>>  static const struct gates_data sun6i_a31_apb2_gates_data __initconst = {
>>       .mask = {0x3F000F},
>>  };
>> @@ -884,6 +977,10 @@ static const struct gates_data sun7i_a20_apb1_gates_data __initconst = {
>>       .mask = { 0xff80ff },
>>  };
>>
>> +static const struct gates_data sun8i_a23_apb2_gates_data __initconst = {
>> +     .mask = {0x1F0007},
>> +};
>> +
>>  static const struct gates_data sun4i_a10_usb_gates_data __initconst = {
>>       .mask = {0x1C0},
>>       .reset_mask = 0x07,
>> @@ -1139,6 +1236,7 @@ free_clkdata:
>>  static const struct of_device_id clk_factors_match[] __initconst = {
>>       {.compatible = "allwinner,sun4i-a10-pll1-clk", .data = &sun4i_pll1_data,},
>>       {.compatible = "allwinner,sun6i-a31-pll1-clk", .data = &sun6i_a31_pll1_data,},
>> +     {.compatible = "allwinner,sun8i-a23-pll1-clk", .data = &sun8i_a23_pll1_data,},
>>       {.compatible = "allwinner,sun7i-a20-pll4-clk", .data = &sun7i_a20_pll4_data,},
>>       {.compatible = "allwinner,sun6i-a31-pll6-clk", .data = &sun6i_a31_pll6_data,},
>>       {.compatible = "allwinner,sun4i-a10-apb1-clk", .data = &sun4i_apb1_data,},
>> @@ -1151,6 +1249,7 @@ static const struct of_device_id clk_factors_match[] __initconst = {
>>  /* Matches for divider clocks */
>>  static const struct of_device_id clk_div_match[] __initconst = {
>>       {.compatible = "allwinner,sun4i-a10-axi-clk", .data = &sun4i_axi_data,},
>> +     {.compatible = "allwinner,sun8i-a23-axi-clk", .data = &sun8i_a23_axi_data,},
>>       {.compatible = "allwinner,sun4i-a10-ahb-clk", .data = &sun4i_ahb_data,},
>>       {.compatible = "allwinner,sun4i-a10-apb0-clk", .data = &sun4i_apb0_data,},
>>       {.compatible = "allwinner,sun6i-a31-apb2-div-clk", .data = &sun6i_a31_apb2_div_data,},
>> @@ -1180,6 +1279,7 @@ static const struct of_device_id clk_gates_match[] __initconst = {
>>       {.compatible = "allwinner,sun5i-a13-ahb-gates-clk", .data = &sun5i_a13_ahb_gates_data,},
>>       {.compatible = "allwinner,sun6i-a31-ahb1-gates-clk", .data = &sun6i_a31_ahb1_gates_data,},
>>       {.compatible = "allwinner,sun7i-a20-ahb-gates-clk", .data = &sun7i_a20_ahb_gates_data,},
>> +     {.compatible = "allwinner,sun8i-a23-ahb1-gates-clk", .data = &sun8i_a23_ahb1_gates_data,},
>>       {.compatible = "allwinner,sun4i-a10-apb0-gates-clk", .data = &sun4i_apb0_gates_data,},
>>       {.compatible = "allwinner,sun5i-a10s-apb0-gates-clk", .data = &sun5i_a10s_apb0_gates_data,},
>>       {.compatible = "allwinner,sun5i-a13-apb0-gates-clk", .data = &sun5i_a13_apb0_gates_data,},
>> @@ -1189,7 +1289,9 @@ static const struct of_device_id clk_gates_match[] __initconst = {
>>       {.compatible = "allwinner,sun5i-a13-apb1-gates-clk", .data = &sun5i_a13_apb1_gates_data,},
>>       {.compatible = "allwinner,sun6i-a31-apb1-gates-clk", .data = &sun6i_a31_apb1_gates_data,},
>>       {.compatible = "allwinner,sun7i-a20-apb1-gates-clk", .data = &sun7i_a20_apb1_gates_data,},
>> +     {.compatible = "allwinner,sun8i-a23-apb1-gates-clk", .data = &sun8i_a23_apb1_gates_data,},
>>       {.compatible = "allwinner,sun6i-a31-apb2-gates-clk", .data = &sun6i_a31_apb2_gates_data,},
>> +     {.compatible = "allwinner,sun8i-a23-apb2-gates-clk", .data = &sun8i_a23_apb2_gates_data,},
>>       {.compatible = "allwinner,sun4i-a10-usb-clk", .data = &sun4i_a10_usb_gates_data,},
>>       {.compatible = "allwinner,sun5i-a13-usb-clk", .data = &sun5i_a13_usb_gates_data,},
>>       {.compatible = "allwinner,sun6i-a31-usb-clk", .data = &sun6i_a31_usb_gates_data,},
>> @@ -1276,3 +1378,16 @@ static void __init sun6i_init_clocks(struct device_node *node)
>>                         ARRAY_SIZE(sun6i_critical_clocks));
>>  }
>>  CLK_OF_DECLARE(sun6i_a31_clk_init, "allwinner,sun6i-a31", sun6i_init_clocks);
>> +
>> +static const char *sun8i_critical_clocks[] __initdata = {
>> +     "cpu",
>> +     "ahb1_sdram",
>> +     "mbus",
>> +};
>> +
>> +static void __init sun8i_init_clocks(void)
>
> This has the wrong prototype and will trigger a warning.

Ah, this was fixed during the latest cycle. Thanks.
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