linux-kernel - Re: [PATCH] clk: aspeed: Support second reset register

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Message-Id: <1524110851.2427206.1343190576.35A8A2AA@webmail.messagingengine.com>
Date:   Thu, 19 Apr 2018 13:37:31 +0930
From:   Andrew Jeffery <andrew@...id.au>
To:     Joel Stanley <joel@....id.au>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Ryan Chen <ryan_chen@...eedtech.com>
Subject: Re: [PATCH] clk: aspeed: Support second reset register

On Thu, 19 Apr 2018, at 12:22, Joel Stanley wrote:
> The ast2500 has an additional reset register that contains resets not
> present in the ast2400. This enables support for this register, and adds
> the one reset line that is controlled by it.
> 
> Signed-off-by: Joel Stanley <joel@....id.au>

The duplication is a bit unfortunate, but all the same:

Reviewed-by: Andrew Jeffery <andrew@...id.au>

> ---
>  drivers/clk/clk-aspeed.c                 | 44 +++++++++++++++++++-----
>  include/dt-bindings/clock/aspeed-clock.h |  1 +
>  2 files changed, 37 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/clk/clk-aspeed.c b/drivers/clk/clk-aspeed.c
> index 5eb50c31e455..93d1dae96624 100644
> --- a/drivers/clk/clk-aspeed.c
> +++ b/drivers/clk/clk-aspeed.c
> @@ -16,6 +16,8 @@
>  
>  #define ASPEED_NUM_CLKS		35
>  
> +#define ASPEED_RESET2_OFFSET	32
> +
>  #define ASPEED_RESET_CTRL	0x04
>  #define ASPEED_CLK_SELECTION	0x08
>  #define ASPEED_CLK_STOP_CTRL	0x0c
> @@ -30,6 +32,7 @@
>  #define  CLKIN_25MHZ_EN		BIT(23)
>  #define  AST2400_CLK_SOURCE_SEL	BIT(18)
>  #define ASPEED_CLK_SELECTION_2	0xd8
> +#define ASPEED_RESET_CTRL2	0xd4
>  
>  /* Globally visible clocks */
>  static DEFINE_SPINLOCK(aspeed_clk_lock);
> @@ -291,6 +294,7 @@ struct aspeed_reset {
>  #define to_aspeed_reset(p) container_of((p), struct aspeed_reset, rcdev)
>  
>  static const u8 aspeed_resets[] = {
> +	/* SCU04 resets */
>  	[ASPEED_RESET_XDMA]	= 25,
>  	[ASPEED_RESET_MCTP]	= 24,
>  	[ASPEED_RESET_ADC]	= 23,
> @@ -300,38 +304,62 @@ static const u8 aspeed_resets[] = {
>  	[ASPEED_RESET_PCIVGA]	=  8,
>  	[ASPEED_RESET_I2C]	=  2,
>  	[ASPEED_RESET_AHB]	=  1,
> +
> +	/*
> +	 * SCUD4 resets start at an offset to separate them from
> +	 * the SCU04 resets.
> +	 */
> +	[ASPEED_RESET_CRT1]	= ASPEED_RESET2_OFFSET + 5,
>  };
>  
>  static int aspeed_reset_deassert(struct reset_controller_dev *rcdev,
>  				 unsigned long id)
>  {
>  	struct aspeed_reset *ar = to_aspeed_reset(rcdev);
> -	u32 rst = BIT(aspeed_resets[id]);
> +	u32 reg = ASPEED_RESET_CTRL;
> +	u32 bit = aspeed_resets[id];
> +
> +	if (bit >= ASPEED_RESET2_OFFSET) {
> +		bit -= ASPEED_RESET2_OFFSET;
> +		reg = ASPEED_RESET_CTRL2;
> +	}
>  
> -	return regmap_update_bits(ar->map, ASPEED_RESET_CTRL, rst, 0);
> +	return regmap_update_bits(ar->map, reg, BIT(bit), 0);
>  }
>  
>  static int aspeed_reset_assert(struct reset_controller_dev *rcdev,
>  			       unsigned long id)
>  {
>  	struct aspeed_reset *ar = to_aspeed_reset(rcdev);
> -	u32 rst = BIT(aspeed_resets[id]);
> +	u32 reg = ASPEED_RESET_CTRL;
> +	u32 bit = aspeed_resets[id];
>  
> -	return regmap_update_bits(ar->map, ASPEED_RESET_CTRL, rst, rst);
> +	if (bit >= ASPEED_RESET_CTRL2) {
> +		bit -= ASPEED_RESET2_OFFSET;
> +		reg = ASPEED_RESET_CTRL2;
> +	}
> +
> +	return regmap_update_bits(ar->map, reg, BIT(bit), BIT(bit));
>  }
>  
>  static int aspeed_reset_status(struct reset_controller_dev *rcdev,
>  			       unsigned long id)
>  {
>  	struct aspeed_reset *ar = to_aspeed_reset(rcdev);
> -	u32 val, rst = BIT(aspeed_resets[id]);
> -	int ret;
> +	u32 reg = ASPEED_RESET_CTRL;
> +	u32 bit = aspeed_resets[id];
> +	int ret, val;
> +
> +	if (bit >= ASPEED_RESET2_OFFSET) {
> +		bit -= ASPEED_RESET2_OFFSET;
> +		reg = ASPEED_RESET_CTRL2;
> +	}
>  
> -	ret = regmap_read(ar->map, ASPEED_RESET_CTRL, &val);
> +	ret = regmap_read(ar->map, reg, &val);
>  	if (ret)
>  		return ret;
>  
> -	return !!(val & rst);
> +	return !!(val & BIT(bit));
>  }
>  
>  static const struct reset_control_ops aspeed_reset_ops = {
> diff --git a/include/dt-bindings/clock/aspeed-clock.h b/include/dt-
> bindings/clock/aspeed-clock.h
> index d3558d897a4d..513c1b4af7a8 100644
> --- a/include/dt-bindings/clock/aspeed-clock.h
> +++ b/include/dt-bindings/clock/aspeed-clock.h
> @@ -48,5 +48,6 @@
>  #define ASPEED_RESET_PCIVGA		6
>  #define ASPEED_RESET_I2C		7
>  #define ASPEED_RESET_AHB		8
> +#define ASPEED_RESET_CRT1		9
>  
>  #endif
> -- 
> 2.17.0
>