linux-kernel - Re: [PATCH v11 1/6] clk: sunxi-ng: h6-r: Add RTC gate clock

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Message-ID: <875fc3d6-fb45-903c-e52e-4abf43b46db2@sholland.org>
Date:   Mon, 2 May 2022 21:06:59 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Andre Przywara <andre.przywara@....com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Chen-Yu Tsai <wens@...e.org>
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 1/6] clk: sunxi-ng: h6-r: Add RTC gate clock

On 4/28/22 6:09 PM, Andre Przywara wrote:
> The H6 and H616 feature an (undocumented) bus clock gate for accessing
> the RTC registers. This seems to be enabled at reset (or by the BootROM),
> so we got away without it so far, but exists regardless.
> 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.
> We do this for both the H6 and H616, but mark it as IGNORE_UNUSED, as we
> cannot reference it in any H6 DTs.
> 
> Signed-off-by: Andre Przywara <andre.przywara@....com>

Reviewed-by: Samuel Holland <samuel@...lland.org>

One tiny nit below, if you resend.

> ---
>  drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c      | 5 +++++
>  drivers/clk/sunxi-ng/ccu-sun50i-h6-r.h      | 2 +-
>  include/dt-bindings/clock/sun50i-h6-r-ccu.h | 1 +
>  3 files changed, 7 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..88509339031e 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), CLK_IGNORE_UNUSED);
>  
>  /* 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,
>  };
>  
> @@ -163,6 +166,7 @@ static struct clk_hw_onecell_data sun50i_h6_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_R_APB1_W1]		= &r_apb1_w1_clk.common.hw,

The new clock should go after CLK_R_APB1_W1 to match the ordering above.

>  		[CLK_IR]		= &ir_clk.common.hw,
>  		[CLK_W1]		= &w1_clk.common.hw,
> @@ -179,6 +183,7 @@ 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_ */
>