linux-kernel - Re: [PATCH V2 1/4] ARM: imx: add i.mx6ulz msl support

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Date:   Fri, 28 Sep 2018 16:44:54 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Anson Huang <Anson.Huang@....com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, s.hauer@...gutronix.de,
        kernel@...gutronix.de, fabio.estevam@....com,
        linux@...linux.org.uk, mturquette@...libre.com, sboyd@...nel.org,
        ping.bai@....com, Aisheng.dong@....com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org, Linux-imx@....com
Subject: Re: [PATCH V2 1/4] ARM: imx: add i.mx6ulz msl support

On Wed, Sep 19, 2018 at 02:04:45PM +0800, Anson Huang wrote:
> The i.MX 6ULZ processor is a high-performance, ultra
> cost-efficient consumer Linux processor featuring an
> advanced implementation of a single Arm® Cortex®-A7 core,
> which operates at speeds up to 900 MHz.
> 
> This patch adds basic MSL support for i.MX6ULZ, the
> i.MX6ULZ has same soc_id as i.MX6ULL, and SRC_SBMR2 bit[6]
> is to differentiate i.MX6ULZ from i.MX6ULL, 1'b1 means
> i.MX6ULZ and 1'b0 means i.MX6ULL.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
>  arch/arm/mach-imx/anatop.c      | 20 ++++++++++++++++++++
>  arch/arm/mach-imx/cpu.c         |  3 +++
>  arch/arm/mach-imx/mach-imx6ul.c |  1 +
>  arch/arm/mach-imx/mxc.h         |  7 +++++++
>  arch/arm/mach-imx/pm-imx6.c     |  4 ++--
>  5 files changed, 33 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/mach-imx/anatop.c b/arch/arm/mach-imx/anatop.c
> index 61f3d94..45d618a 100644
> --- a/arch/arm/mach-imx/anatop.c
> +++ b/arch/arm/mach-imx/anatop.c
> @@ -31,6 +31,8 @@
>  #define ANADIG_DIGPROG_IMX6SL	0x280
>  #define ANADIG_DIGPROG_IMX7D	0x800
>  
> +#define SRC_SBMR2		0x1c
> +
>  #define BM_ANADIG_REG_2P5_ENABLE_WEAK_LINREG	0x40000
>  #define BM_ANADIG_REG_2P5_ENABLE_PULLDOWN	0x8
>  #define BM_ANADIG_REG_CORE_FET_ODRIVE		0x20000000
> @@ -148,6 +150,24 @@ void __init imx_init_revision_from_anatop(void)
>  		major_part = (digprog >> 8) & 0xf;
>  		minor_part = digprog & 0xf;
>  		revision = ((major_part + 1) << 4) | minor_part;
> +
> +		if ((digprog >> 16) == MXC_CPU_IMX6ULL) {
> +			void __iomem *src_base;
> +			u32 sbmr2;
> +
> +			np = of_find_compatible_node(NULL, NULL,
> +						     "fsl,imx6ul-src");
> +			src_base = of_iomap(np, 0);
> +			WARN_ON(!src_base);
> +			sbmr2 = readl_relaxed(src_base + SRC_SBMR2);
> +			iounmap(src_base);
> +
> +			/* src_sbmr2 bit 6 is to identify if it is i.MX6ULZ */
> +			if (sbmr2 & (1 << 6)) {
> +				digprog &= ~(0xff << 16);
> +				digprog |= (MXC_CPU_IMX6ULZ << 16);
> +			}
> +		}
>  	}
>  
>  	mxc_set_cpu_type(digprog >> 16 & 0xff);
> diff --git a/arch/arm/mach-imx/cpu.c b/arch/arm/mach-imx/cpu.c
> index c6b1bf9..c73593e 100644
> --- a/arch/arm/mach-imx/cpu.c
> +++ b/arch/arm/mach-imx/cpu.c
> @@ -136,6 +136,9 @@ struct device * __init imx_soc_device_init(void)
>  	case MXC_CPU_IMX6ULL:
>  		soc_id = "i.MX6ULL";
>  		break;
> +	case MXC_CPU_IMX6ULZ:
> +		soc_id = "i.MX6ULZ";
> +		break;
>  	case MXC_CPU_IMX6SLL:
>  		soc_id = "i.MX6SLL";
>  		break;
> diff --git a/arch/arm/mach-imx/mach-imx6ul.c b/arch/arm/mach-imx/mach-imx6ul.c
> index 6cb8a22..4ffe3c8 100644
> --- a/arch/arm/mach-imx/mach-imx6ul.c
> +++ b/arch/arm/mach-imx/mach-imx6ul.c
> @@ -90,6 +90,7 @@ static void __init imx6ul_init_late(void)
>  static const char * const imx6ul_dt_compat[] __initconst = {
>  	"fsl,imx6ul",
>  	"fsl,imx6ull",
> +	"fsl,imx6ulz",

Can we have "fsl,imx6ull" on the DT compatible, so that we can save the
changes on kernel side, like this and the clock driver update (patch #2)?

  compatible = "fsl,imx6ull", "fsl,imx6ulz";

I'm not sure if there is any problem with this approach.  But you can
think about it.

Shawn

>  	NULL,
>  };
>  
> diff --git a/arch/arm/mach-imx/mxc.h b/arch/arm/mach-imx/mxc.h
> index 026e2ca..b130a53 100644
> --- a/arch/arm/mach-imx/mxc.h
> +++ b/arch/arm/mach-imx/mxc.h
> @@ -40,6 +40,8 @@
>  #define MXC_CPU_IMX6Q		0x63
>  #define MXC_CPU_IMX6UL		0x64
>  #define MXC_CPU_IMX6ULL		0x65
> +/* virtual cpu id for i.mx6ulz */
> +#define MXC_CPU_IMX6ULZ		0x6b
>  #define MXC_CPU_IMX6SLL		0x67
>  #define MXC_CPU_IMX7D		0x72
>  
> @@ -80,6 +82,11 @@ static inline bool cpu_is_imx6ull(void)
>  	return __mxc_cpu_type == MXC_CPU_IMX6ULL;
>  }
>  
> +static inline bool cpu_is_imx6ulz(void)
> +{
> +	return __mxc_cpu_type == MXC_CPU_IMX6ULZ;
> +}
> +
>  static inline bool cpu_is_imx6sll(void)
>  {
>  	return __mxc_cpu_type == MXC_CPU_IMX6SLL;
> diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c
> index 529f4b5..87f45b9 100644
> --- a/arch/arm/mach-imx/pm-imx6.c
> +++ b/arch/arm/mach-imx/pm-imx6.c
> @@ -313,7 +313,7 @@ int imx6_set_lpm(enum mxc_cpu_pwr_mode mode)
>  		if (cpu_is_imx6sl())
>  			val |= BM_CLPCR_BYPASS_PMIC_READY;
>  		if (cpu_is_imx6sl() || cpu_is_imx6sx() || cpu_is_imx6ul() ||
> -		    cpu_is_imx6ull() || cpu_is_imx6sll())
> +		    cpu_is_imx6ull() || cpu_is_imx6sll() || cpu_is_imx6ulz())
>  			val |= BM_CLPCR_BYP_MMDC_CH0_LPM_HS;
>  		else
>  			val |= BM_CLPCR_BYP_MMDC_CH1_LPM_HS;
> @@ -331,7 +331,7 @@ int imx6_set_lpm(enum mxc_cpu_pwr_mode mode)
>  		if (cpu_is_imx6sl() || cpu_is_imx6sx())
>  			val |= BM_CLPCR_BYPASS_PMIC_READY;
>  		if (cpu_is_imx6sl() || cpu_is_imx6sx() || cpu_is_imx6ul() ||
> -		    cpu_is_imx6ull() || cpu_is_imx6sll())
> +		    cpu_is_imx6ull() || cpu_is_imx6sll() || cpu_is_imx6ulz())
>  			val |= BM_CLPCR_BYP_MMDC_CH0_LPM_HS;
>  		else
>  			val |= BM_CLPCR_BYP_MMDC_CH1_LPM_HS;
> -- 
> 2.7.4
>