Re: [PATCH 6/8] clocksource: sh_cmt: Support separate R-car Gen3 CMT0/1

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Bui Duc,

Thank you for the patch.

On Friday 09 Sep 2016 20:43:12 bd-phuc@jinso.co.jp wrote:
> From: Bui Duc Phuc <bd-phuc@jinso.co.jp>
> 
> Add support for the new R-Car Gen3 CMT0 and CMT1 bindings.
> 
> Signed-off-by: Bui Duc Phuc <bd-phuc@jinso.co.jp>
> ---
>  drivers/clocksource/sh_cmt.c | 21 +++++++++++++++++++--
>  1 file changed, 19 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
> index 103c493..1542aef 100644
> --- a/drivers/clocksource/sh_cmt.c
> +++ b/drivers/clocksource/sh_cmt.c
> @@ -69,6 +69,7 @@ enum sh_cmt_model {
>  	SH_CMT_32BIT_FAST,
>  	SH_CMT_48BIT,
>  	SH_CMT_48BIT_GEN2,
> +	SH_CMT_48BIT_GEN3,
>  };
> 
>  struct sh_cmt_info {
> @@ -230,6 +231,16 @@ static const struct sh_cmt_info sh_cmt_info[] = {
>  		.read_count = sh_cmt_read32,
>  		.write_count = sh_cmt_write32,
>  	},
> +	[SH_CMT_48BIT_GEN3] = {
> +		.model = SH_CMT_48BIT_GEN3,
> +		.width = 32,
> +		.overflow_bit = SH_CMT32_CMCSR_CMF,
> +		.clear_bits = ~(SH_CMT32_CMCSR_CMF | SH_CMT32_CMCSR_OVF),
> +		.read_control = sh_cmt_read32,
> +		.write_control = sh_cmt_write32,
> +		.read_count = sh_cmt_read32,
> +		.write_count = sh_cmt_write32,
> +	},
>  };
> 
>  #define CMCSR 0 /* channel register */
> @@ -864,6 +875,7 @@ static int sh_cmt_setup_channel(struct sh_cmt_channel
> *ch, unsigned int index, ch->cmt = cmt;
>  	ch->index = index;
>  	ch->hwidx = hwidx;
> +	ch->timer_bit = hwidx;
> 
>  	/*
>  	 * Compute the address of the channel control register block. For the
> @@ -888,6 +900,12 @@ static int sh_cmt_setup_channel(struct sh_cmt_channel
> *ch, unsigned int index, case SH_CMT_48BIT_GEN2:
>  		ch->iostart = cmt->mapbase + ch->hwidx * 0x100;
>  		ch->ioctrl = ch->iostart + 0x10;
> +		ch->timer_bit = 0;
> +		break;
> +	case SH_CMT_48BIT_GEN3:
> +		ch->iostart = cmt->mapbase + ch->hwidx * 0x100;
> +		ch->ioctrl = ch->iostart + 0x10;
> +		ch->timer_bit = 0;
>  		break;
>  	}
> 
> @@ -899,8 +917,6 @@ static int sh_cmt_setup_channel(struct sh_cmt_channel
> *ch, unsigned int index, ch->match_value = ch->max_match_value;
>  	raw_spin_lock_init(&ch->lock);
> 
> -	ch->timer_bit = cmt->info->model == SH_CMT_48BIT_GEN2 ? 0 : ch->hwidx;
> -
>  	ret = sh_cmt_register(ch, dev_name(&cmt->pdev->dev),
>  			      clockevent, clocksource);
>  	if (ret) {
> @@ -944,6 +960,7 @@ static const struct of_device_id sh_cmt_of_table[]
> __maybe_unused = {
>  	{ .compatible = "renesas,cmt-32-fast", .data =
> &sh_cmt_info[SH_CMT_32BIT_FAST] },
>  	{ .compatible = "renesas,cmt-48", .data = &sh_cmt_info[SH_CMT_48BIT]
> },
>  	{ .compatible = "renesas,cmt-48-gen2", .data =
> &sh_cmt_info[SH_CMT_48BIT_GEN2] },
> +	{ .compatible = "renesas,cmt-48-gen3", .data =
> &sh_cmt_info[SH_CMT_48BIT_GEN3] },

Given that the Gen2 and Gen3 CMT seem identical based on the above code, how 
about just using SH_CMT_48BIT_GEN2 here ? You wouldn't need any of the above 
changes.

>  	{ }
>  };
>  MODULE_DEVICE_TABLE(of, sh_cmt_of_table);

-- 
Regards,

Laurent Pinchart