linux-kernel - Re: [RFC PATCH 6/7] [DO NOT MERGE] clk: sunxi-ng: Add support for H6

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Date:   Fri, 3 Sep 2021 16:51:20 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 6/7] [DO NOT MERGE] clk: sunxi-ng: Add support for H6

On Wed, Sep 01, 2021 at 12:39:50AM -0500, Samuel Holland wrote:
> H6 has IOSC calibration and an ext-osc32k input.
> 
> H6 has the osc32k mux and the rtc-32k mux, but no fanout mux.
> 
> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
>  drivers/clk/sunxi-ng/sun50i-rtc-ccu.c | 49 +++++++++++++++++++++++++++
>  drivers/rtc/rtc-sun6i.c               | 17 ----------
>  2 files changed, 49 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/clk/sunxi-ng/sun50i-rtc-ccu.c b/drivers/clk/sunxi-ng/sun50i-rtc-ccu.c
> index 1dfa05c2f0e9..9603dc0d3d7b 100644
> --- a/drivers/clk/sunxi-ng/sun50i-rtc-ccu.c
> +++ b/drivers/clk/sunxi-ng/sun50i-rtc-ccu.c
> @@ -227,6 +227,16 @@ static SUNXI_CCU_MUX_DATA_WITH_GATE(osc32k_fanout_clk, "rtc-32k-fanout",
>  static SUNXI_CCU_M_FW_WITH_GATE(rtc_spi_clk, "rtc-spi", "ahb",
>  				0x310, 0, 5, BIT(31), 0);
>  
> +static struct ccu_common *sun50i_h6_rtc_ccu_clks[] = {
> +	&iosc_clk,
> +	&iosc_32k_clk,
> +	&ext_osc32k_gate_clk.common,
> +	&osc32k_clk.common,
> +	&osc24M_32k_clk.common,
> +	&rtc_32k_mux_clk.common,
> +	&osc32k_fanout_clk.common,
> +};
> +
>  static struct ccu_common *sun50i_h616_rtc_ccu_clks[] = {
>  	&iosc_clk,
>  	&iosc_32k_clk,
> @@ -246,6 +256,21 @@ static struct ccu_common *sun50i_r329_rtc_ccu_clks[] = {
>  	&rtc_spi_clk.common,
>  };
>  
> +static struct clk_hw_onecell_data sun50i_h6_rtc_ccu_hw_clks = {
> +	.num = CLK_NUMBER,
> +	.hws = {
> +		[CLK_OSC32K]		= &osc32k_clk.common.hw,
> +		[CLK_OSC32K_FANOUT]	= &osc32k_fanout_clk.common.hw,
> +		[CLK_IOSC]		= &iosc_clk.hw,
> +
> +		[CLK_IOSC_32K]		= &iosc_32k_clk.hw,
> +		[CLK_EXT_OSC32K_GATE]	= &ext_osc32k_gate_clk.common.hw,
> +		[CLK_OSC24M_32K]	= &osc24M_32k_clk.common.hw,
> +		[CLK_RTC_32K]		= &rtc_32k_mux_clk.common.hw,
> +		[CLK_RTC_SPI]		= NULL,
> +	},
> +};
> +
>  static struct clk_hw_onecell_data sun50i_h616_rtc_ccu_hw_clks = {
>  	.num = CLK_NUMBER,
>  	.hws = {
> @@ -276,6 +301,13 @@ static struct clk_hw_onecell_data sun50i_r329_rtc_ccu_hw_clks = {
>  	},
>  };
>  
> +static const struct sunxi_ccu_desc sun50i_h6_rtc_ccu_desc = {
> +	.ccu_clks	= sun50i_h6_rtc_ccu_clks,
> +	.num_ccu_clks	= ARRAY_SIZE(sun50i_h6_rtc_ccu_clks),
> +
> +	.hw_clks	= &sun50i_h6_rtc_ccu_hw_clks,
> +};
> +
>  static const struct sunxi_ccu_desc sun50i_h616_rtc_ccu_desc = {
>  	.ccu_clks	= sun50i_h616_rtc_ccu_clks,
>  	.num_ccu_clks	= ARRAY_SIZE(sun50i_h616_rtc_ccu_clks),
> @@ -318,6 +350,23 @@ static void __init sunxi_rtc_ccu_init(struct device_node *node,
>  	of_sunxi_ccu_probe(node, reg, desc);
>  }
>  
> +static void __init sun50i_h6_rtc_ccu_setup(struct device_node *node)
> +{
> +	struct clk_init_data *init;
> +
> +	have_iosc_calib = 1;
> +
> +	/* Casting away the const from a pointer to a non-const anonymous object... */
> +	init = (struct clk_init_data *)osc32k_fanout_clk.common.hw.init;
> +
> +	/* Fanout only has one parent: osc32k. */
> +	init->num_parents = 1;
> +
> +	sunxi_rtc_ccu_init(node, &sun50i_h6_rtc_ccu_desc);
> +}

Indeed, that's not great.

Maybe we should just duplicate the sun50i_h6_rtc_ccu_desc (and
osc32k_fanout_clk) to cover both cases?

Maxime

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