linux-kernel - Re: [PATCH 1/3] ARM: dra762: hwmod: Add MCAN support

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Message-ID: <20180517210931.GQ98604@atomide.com>
Date:   Thu, 17 May 2018 14:09:31 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Faiz Abbas <faiz_abbas@...com>
Cc:     linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        devicetree@...r.kernel.org, bcousson@...libre.com,
        robh+dt@...nel.org, mark.rutland@....com, paul@...an.com,
        lokeshvutla@...com, linux@...linux.org.uk
Subject: Re: [PATCH 1/3] ARM: dra762: hwmod: Add MCAN support

* Faiz Abbas <faiz_abbas@...com> [180408 09:59]:
> From: Lokesh Vutla <lokeshvutla@...com>
> 
> Add MCAN hwmod data and register it for dra762 silicons.
> 
> Signed-off-by: Lokesh Vutla <lokeshvutla@...com>
> Signed-off-by: Faiz Abbas <faiz_abbas@...com>
> ---
>  arch/arm/mach-omap2/omap_hwmod_7xx_data.c | 32 +++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/arch/arm/mach-omap2/omap_hwmod_7xx_data.c b/arch/arm/mach-omap2/omap_hwmod_7xx_data.c
> index 62352d1..a2cd7f8 100644
> --- a/arch/arm/mach-omap2/omap_hwmod_7xx_data.c
> +++ b/arch/arm/mach-omap2/omap_hwmod_7xx_data.c
> @@ -1356,6 +1356,29 @@ static struct omap_hwmod dra7xx_mailbox13_hwmod = {
>  };
>  
>  /*
> + * 'mcan' class
> + *
> + */
> +static struct omap_hwmod_class dra76x_mcan_hwmod_class = {
> +	.name	= "mcan",
> +};
> +
> +/* mcan */
> +static struct omap_hwmod dra76x_mcan_hwmod = {
> +	.name		= "mcan",
> +	.class		= &dra76x_mcan_hwmod_class,
> +	.clkdm_name	= "wkupaon_clkdm",
> +	.main_clk	= "mcan_clk",
> +	.prcm = {
> +		.omap4 = {
> +			.clkctrl_offs = DRA7XX_CM_WKUPAON_ADC_CLKCTRL_OFFSET,
> +			.context_offs = DRA7XX_RM_WKUPAON_ADC_CONTEXT_OFFSET,
> +			.modulemode   = MODULEMODE_SWCTRL,
> +		},
> +	},
> +};

So based on the ti-sysc related dts comments, this patch should
work except you should be able to just leave out the clocks here
with the dts changes.

> +/*
>   * 'mcspi' class
>   *
>   */
> @@ -3818,6 +3841,14 @@ static struct omap_hwmod_ocp_if dra7xx_l4_per2__epwmss2 = {
>  	.user		= OCP_USER_MPU,
>  };
>  
> +/* l3_main_1 -> mcan */
> +static struct omap_hwmod_ocp_if dra76x_l3_main_1__mcan = {
> +	.master		= &dra7xx_l3_main_1_hwmod,
> +	.slave		= &dra76x_mcan_hwmod,
> +	.clk		= "l3_iclk_div",
> +	.user		= OCP_USER_MPU | OCP_USER_SDMA,
> +};
> +
>  static struct omap_hwmod_ocp_if *dra7xx_hwmod_ocp_ifs[] __initdata = {
>  	&dra7xx_l3_main_1__dmm,
>  	&dra7xx_l3_main_2__l3_instr,
> @@ -3958,6 +3989,7 @@ static struct omap_hwmod_ocp_if *dra7xx_gp_hwmod_ocp_ifs[] __initdata = {
>  /* SoC variant specific hwmod links */
>  static struct omap_hwmod_ocp_if *dra76x_hwmod_ocp_ifs[] __initdata = {
>  	&dra7xx_l4_per3__usb_otg_ss4,
> +	&dra76x_l3_main_1__mcan,
>  	NULL,
>  };

So the omap_hwmod_class, omap_hwmod_ocp_if and entry on the
dra76x_hwmod_ocp_ifs list are still needed with ti-sysc for a
while. Eventually that data will just come from the dts interconnect
hierarchy. For struct omap_hwmod_class_sysconfig, ti-sysc will
allocate and it based on the dts data.

Regards,

Tony