linux-kernel - Re: [PATCH v10 01/18] clk: sunxi-ng: h616-r: Add RTC gate clock

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Message-ID: <01e8d2a0-cdeb-ab64-42a7-48376b49c00e@sholland.org>
Date:   Tue, 22 Feb 2022 21:22:07 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Rob Herring <robh@...nel.org>,
        Ondrej Jirman <megous@...ous.com>,
        Icenowy Zheng <icenowy@...c.io>,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org
Subject: Re: [PATCH v10 01/18] clk: sunxi-ng: h616-r: Add RTC gate clock

On 2/11/22 6:26 AM, Andre Przywara wrote:
> The H616 features an (undocumented) bus clock gate for accessing the RTC
> registers. This seems to be enabled at reset (or by the BootROM), but is
> there anyway.
> Since the new RTC clock binding for the H616 requires this "bus" clock
> to be specified in the DT, add this to R_CCU clock driver and expose it
> on the DT side with a new number.

It would be good to note why you didn't add this clock to H6, even though it
exists in that hardware.

> Signed-off-by: Andre Przywara <andre.przywara@....com>
> ---
>  drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c      | 4 ++++
>  drivers/clk/sunxi-ng/ccu-sun50i-h6-r.h      | 2 +-
>  include/dt-bindings/clock/sun50i-h6-r-ccu.h | 1 +
>  3 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c b/drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c
> index 712e103382d8..26fb092f6df6 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c
> +++ b/drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c
> @@ -98,6 +98,8 @@ static SUNXI_CCU_GATE(r_apb1_ir_clk,	"r-apb1-ir",	"r-apb1",
>  		      0x1cc, BIT(0), 0);
>  static SUNXI_CCU_GATE(r_apb1_w1_clk,	"r-apb1-w1",	"r-apb1",
>  		      0x1ec, BIT(0), 0);
> +static SUNXI_CCU_GATE(r_apb1_rtc_clk,	"r-apb1-rtc",	"r-apb1",
> +		      0x20c, BIT(0), 0);

All of the documentation I have found (manuals, A100 driver, BSP D1 driver)
points to this clock coming off of R_AHB, not R_APB1.

Regards,
Samuel

>  
>  /* Information of IR(RX) mod clock is gathered from BSP source code */
>  static const char * const r_mod0_default_parents[] = { "osc32k", "osc24M" };
> @@ -147,6 +149,7 @@ static struct ccu_common *sun50i_h616_r_ccu_clks[] = {
>  	&r_apb2_i2c_clk.common,
>  	&r_apb2_rsb_clk.common,
>  	&r_apb1_ir_clk.common,
> +	&r_apb1_rtc_clk.common,
>  	&ir_clk.common,
>  };
>  
> @@ -179,6 +182,7 @@ static struct clk_hw_onecell_data sun50i_h616_r_hw_clks = {
>  		[CLK_R_APB2_I2C]	= &r_apb2_i2c_clk.common.hw,
>  		[CLK_R_APB2_RSB]	= &r_apb2_rsb_clk.common.hw,
>  		[CLK_R_APB1_IR]		= &r_apb1_ir_clk.common.hw,
> +		[CLK_R_APB1_RTC]	= &r_apb1_rtc_clk.common.hw,
>  		[CLK_IR]		= &ir_clk.common.hw,
>  	},
>  	.num	= CLK_NUMBER,
> diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-h6-r.h b/drivers/clk/sunxi-ng/ccu-sun50i-h6-r.h
> index 7e290b840803..10e9b66afc6a 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun50i-h6-r.h
> +++ b/drivers/clk/sunxi-ng/ccu-sun50i-h6-r.h
> @@ -14,6 +14,6 @@
>  
>  #define CLK_R_APB2	3
>  
> -#define CLK_NUMBER	(CLK_R_APB2_RSB + 1)
> +#define CLK_NUMBER	(CLK_R_APB1_RTC + 1)
>  
>  #endif /* _CCU_SUN50I_H6_R_H */
> diff --git a/include/dt-bindings/clock/sun50i-h6-r-ccu.h b/include/dt-bindings/clock/sun50i-h6-r-ccu.h
> index 890368d252c4..a96087abc86f 100644
> --- a/include/dt-bindings/clock/sun50i-h6-r-ccu.h
> +++ b/include/dt-bindings/clock/sun50i-h6-r-ccu.h
> @@ -22,5 +22,6 @@
>  #define CLK_W1			12
>  
>  #define CLK_R_APB2_RSB		13
> +#define CLK_R_APB1_RTC		14
>  
>  #endif /* _DT_BINDINGS_CLK_SUN50I_H6_R_CCU_H_ */
>