linux-kernel - Re: [PATCH v11 2/6] clk: sunxi-ng: h616: Add PLL derived 32KHz clock

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Date:   Fri, 06 May 2022 18:11:04 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     Samuel Holland <samuel@...lland.org>, Chen-Yu Tsai <wens@...e.org>,
        Andre Przywara <andre.przywara@....com>
Cc:     Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Icenowy Zheng <icenowy@...c.io>,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH v11 2/6] clk: sunxi-ng: h616: Add PLL derived 32KHz clock

Dne petek, 29. april 2022 ob 01:09:29 CEST je Andre Przywara napisal(a):
> The RTC section of the H616 manual mentions in a half-sentence the
> existence of a clock "32K divided by PLL_PERI(2X)". This is used as
> one of the possible inputs for the mux that selects the clock for the
> 32 KHz fanout pad. On the H616 this is routed to pin PG10, and some
> boards use that clock output to compensate for a missing 32KHz crystal.
> On the OrangePi Zero2 this is for instance connected to the LPO pin of
> the WiFi/BT chip.
> The new RTC clock binding requires this clock to be named as one input
> clock, so we need to expose this to the DT. In contrast to the D1 SoC
> there does not seem to be a gate for this clock, so just use a fixed
> divider clock, using a newly assigned clock number.
> 
> Signed-off-by: Andre Przywara <andre.przywara@....com>
> Reviewed-by: Samuel Holland <samuel@...lland.org>

Applied to sunxi/clk-for-5.19, thanks!

Best regards,
Jernej

> ---
>  drivers/clk/sunxi-ng/ccu-sun50i-h616.c      | 8 ++++++++
>  drivers/clk/sunxi-ng/ccu-sun50i-h616.h      | 2 +-
>  include/dt-bindings/clock/sun50i-h616-ccu.h | 1 +
>  3 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-h616.c b/drivers/clk/sunxi-ng/
ccu-sun50i-h616.c
> index 49a2474cf314..21e918582aa5 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun50i-h616.c
> +++ b/drivers/clk/sunxi-ng/ccu-sun50i-h616.c
> @@ -704,6 +704,13 @@ static CLK_FIXED_FACTOR_HWS(pll_periph0_2x_clk, "pll-
periph0-2x",
>  			    pll_periph0_parents,
>  			    1, 2, 0);
>  
> +static const struct clk_hw *pll_periph0_2x_hws[] = {
> +	&pll_periph0_2x_clk.hw
> +};
> +
> +static CLK_FIXED_FACTOR_HWS(pll_system_32k_clk, "pll-system-32k",
> +			    pll_periph0_2x_hws, 36621, 1, 0);
> +
>  static const struct clk_hw *pll_periph1_parents[] = {
>  	&pll_periph1_clk.common.hw
>  };
> @@ -852,6 +859,7 @@ static struct clk_hw_onecell_data sun50i_h616_hw_clks = 
{
>  		[CLK_PLL_DDR1]		= 
&pll_ddr1_clk.common.hw,
>  		[CLK_PLL_PERIPH0]	= &pll_periph0_clk.common.hw,
>  		[CLK_PLL_PERIPH0_2X]	= &pll_periph0_2x_clk.hw,
> +		[CLK_PLL_SYSTEM_32K]	= &pll_system_32k_clk.hw,
>  		[CLK_PLL_PERIPH1]	= &pll_periph1_clk.common.hw,
>  		[CLK_PLL_PERIPH1_2X]	= &pll_periph1_2x_clk.hw,
>  		[CLK_PLL_GPU]		= 
&pll_gpu_clk.common.hw,
> diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-h616.h b/drivers/clk/sunxi-ng/
ccu-sun50i-h616.h
> index dd671b413f22..fdd2f4d5103f 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun50i-h616.h
> +++ b/drivers/clk/sunxi-ng/ccu-sun50i-h616.h
> @@ -51,6 +51,6 @@
>  
>  #define CLK_BUS_DRAM		56
>  
> -#define CLK_NUMBER		(CLK_BUS_HDCP + 1)
> +#define CLK_NUMBER		(CLK_PLL_SYSTEM_32K + 1)
>  
>  #endif /* _CCU_SUN50I_H616_H_ */
> diff --git a/include/dt-bindings/clock/sun50i-h616-ccu.h b/include/dt-
bindings/clock/sun50i-h616-ccu.h
> index 4fc08b0df2f3..1191aca53ac6 100644
> --- a/include/dt-bindings/clock/sun50i-h616-ccu.h
> +++ b/include/dt-bindings/clock/sun50i-h616-ccu.h
> @@ -111,5 +111,6 @@
>  #define CLK_BUS_TVE0		125
>  #define CLK_HDCP		126
>  #define CLK_BUS_HDCP		127
> +#define CLK_PLL_SYSTEM_32K	128
>  
>  #endif /* _DT_BINDINGS_CLK_SUN50I_H616_H_ */
> -- 
> 2.35.3
> 
>