linux-kernel - Re: [PATCH 5/5] clk: sunxi-ng: d1: Add CAN bus gates and resets

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Date:   Sat, 3 Dec 2022 00:40:53 +0000
From:   Andre Przywara <andre.przywara@....com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...ts.linux.dev,
        Fabien Poussin <fabien.poussin@...il.com>
Subject: Re: [PATCH 5/5] clk: sunxi-ng: d1: Add CAN bus gates and resets

On Sat, 26 Nov 2022 13:13:19 -0600
Samuel Holland <samuel@...lland.org> wrote:

Hi,

> From: Fabien Poussin <fabien.poussin@...il.com>
> 
> The D1 CCU contains gates and resets for two CAN buses. While the CAN
> bus controllers are only documented for the T113 SoC, the CCU is the
> same across all SoC variants.

So my version of the T113 manual only barely mentions the existence of
CAN controllers, but doesn't list any details, not even a base address
or those clock gates.
However I can confirm that the two lowest bits are implemented in
+0x92c. I also verified that the bits and numbers below match up.

> Signed-off-by: Fabien Poussin <fabien.poussin@...il.com>
> Signed-off-by: Samuel Holland <samuel@...lland.org>

Reviewed-by: Andre Przywara <andre.przywara@....com>

Cheers,
Andre

> ---
> 
>  drivers/clk/sunxi-ng/ccu-sun20i-d1.c      | 11 +++++++++++
>  drivers/clk/sunxi-ng/ccu-sun20i-d1.h      |  2 +-
>  include/dt-bindings/clock/sun20i-d1-ccu.h |  2 ++
>  include/dt-bindings/reset/sun20i-d1-ccu.h |  2 ++
>  4 files changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/sunxi-ng/ccu-sun20i-d1.c b/drivers/clk/sunxi-ng/ccu-sun20i-d1.c
> index c5a7df93602c..48a8fb2c43b7 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun20i-d1.c
> +++ b/drivers/clk/sunxi-ng/ccu-sun20i-d1.c
> @@ -469,6 +469,11 @@ static SUNXI_CCU_GATE_HWS(bus_i2c2_clk, "bus-i2c2", apb1_hws,
>  static SUNXI_CCU_GATE_HWS(bus_i2c3_clk, "bus-i2c3", apb1_hws,
>  			  0x91c, BIT(3), 0);
>  
> +static SUNXI_CCU_GATE_HWS(bus_can0_clk, "bus-can0", apb1_hws,
> +			  0x92c, BIT(0), 0);
> +static SUNXI_CCU_GATE_HWS(bus_can1_clk, "bus-can1", apb1_hws,
> +			  0x92c, BIT(1), 0);
> +
>  static const struct clk_parent_data spi_parents[] = {
>  	{ .fw_name = "hosc" },
>  	{ .hw = &pll_periph0_clk.hw },
> @@ -997,6 +1002,8 @@ static struct ccu_common *sun20i_d1_ccu_clks[] = {
>  	&bus_i2c1_clk.common,
>  	&bus_i2c2_clk.common,
>  	&bus_i2c3_clk.common,
> +	&bus_can0_clk.common,
> +	&bus_can1_clk.common,
>  	&spi0_clk.common,
>  	&spi1_clk.common,
>  	&bus_spi0_clk.common,
> @@ -1147,6 +1154,8 @@ static struct clk_hw_onecell_data sun20i_d1_hw_clks = {
>  		[CLK_BUS_I2C1]		= &bus_i2c1_clk.common.hw,
>  		[CLK_BUS_I2C2]		= &bus_i2c2_clk.common.hw,
>  		[CLK_BUS_I2C3]		= &bus_i2c3_clk.common.hw,
> +		[CLK_BUS_CAN0]		= &bus_can0_clk.common.hw,
> +		[CLK_BUS_CAN1]		= &bus_can1_clk.common.hw,
>  		[CLK_SPI0]		= &spi0_clk.common.hw,
>  		[CLK_SPI1]		= &spi1_clk.common.hw,
>  		[CLK_BUS_SPI0]		= &bus_spi0_clk.common.hw,
> @@ -1252,6 +1261,8 @@ static struct ccu_reset_map sun20i_d1_ccu_resets[] = {
>  	[RST_BUS_I2C1]		= { 0x91c, BIT(17) },
>  	[RST_BUS_I2C2]		= { 0x91c, BIT(18) },
>  	[RST_BUS_I2C3]		= { 0x91c, BIT(19) },
> +	[RST_BUS_CAN0]		= { 0x92c, BIT(16) },
> +	[RST_BUS_CAN1]		= { 0x92c, BIT(17) },
>  	[RST_BUS_SPI0]		= { 0x96c, BIT(16) },
>  	[RST_BUS_SPI1]		= { 0x96c, BIT(17) },
>  	[RST_BUS_EMAC]		= { 0x97c, BIT(16) },
> diff --git a/drivers/clk/sunxi-ng/ccu-sun20i-d1.h b/drivers/clk/sunxi-ng/ccu-sun20i-d1.h
> index e303176f0d4e..b14da36e2537 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun20i-d1.h
> +++ b/drivers/clk/sunxi-ng/ccu-sun20i-d1.h
> @@ -10,6 +10,6 @@
>  #include <dt-bindings/clock/sun20i-d1-ccu.h>
>  #include <dt-bindings/reset/sun20i-d1-ccu.h>
>  
> -#define CLK_NUMBER		(CLK_FANOUT2 + 1)
> +#define CLK_NUMBER		(CLK_BUS_CAN1 + 1)
>  
>  #endif /* _CCU_SUN20I_D1_H_ */
> diff --git a/include/dt-bindings/clock/sun20i-d1-ccu.h b/include/dt-bindings/clock/sun20i-d1-ccu.h
> index e3ac53315e1a..e143b9929763 100644
> --- a/include/dt-bindings/clock/sun20i-d1-ccu.h
> +++ b/include/dt-bindings/clock/sun20i-d1-ccu.h
> @@ -152,5 +152,7 @@
>  #define CLK_FANOUT0		142
>  #define CLK_FANOUT1		143
>  #define CLK_FANOUT2		144
> +#define CLK_BUS_CAN0		145
> +#define CLK_BUS_CAN1		146
>  
>  #endif /* _DT_BINDINGS_CLK_SUN20I_D1_CCU_H_ */
> diff --git a/include/dt-bindings/reset/sun20i-d1-ccu.h b/include/dt-bindings/reset/sun20i-d1-ccu.h
> index de9ff5203239..f8001cf50bf1 100644
> --- a/include/dt-bindings/reset/sun20i-d1-ccu.h
> +++ b/include/dt-bindings/reset/sun20i-d1-ccu.h
> @@ -73,5 +73,7 @@
>  #define RST_BUS_DSP_CFG		63
>  #define RST_BUS_DSP_DBG		64
>  #define RST_BUS_RISCV_CFG	65
> +#define RST_BUS_CAN0		66
> +#define RST_BUS_CAN1		67
>  
>  #endif /* _DT_BINDINGS_RST_SUN20I_D1_CCU_H_ */