linux-kernel - Re: [PATCH] clk: at91: sama7g5: Allow MCK1 to be exported and referenced in DT

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Message-ID: <528f5d1b-aeeb-6c2a-42a5-e4e2f2fba2c5@microchip.com>
Date:   Tue, 11 Jan 2022 15:23:02 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <Tudor.Ambarus@...rochip.com>, <mturquette@...libre.com>,
        <sboyd@...nel.org>
CC:     <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <Ludovic.Desroches@...rochip.com>, <robh+dt@...nel.org>,
        <rdunlap@...radead.org>, <unixbhaskar@...il.com>,
        <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH] clk: at91: sama7g5: Allow MCK1 to be exported and
 referenced in DT

On 11.01.2022 14:53, Tudor Ambarus wrote:
> MCK1 feeds the External Bus Interface (EBI). EBI's clock rate is used
> to translate EBI's timmings to SMC timings, thus we need to handle MCK1
> in the EBI driver. Allow MCK1 to be referenced as a PMC_TYPE_CORE clock
> from phandle in DT.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>

Reviewed-by: Claudiu Beznea <claudiu.beznea@...rochip.com>

> ---
>  drivers/clk/at91/sama7g5.c       | 8 +++++++-
>  include/dt-bindings/clock/at91.h | 1 +
>  2 files changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/at91/sama7g5.c b/drivers/clk/at91/sama7g5.c
> index 369dfafabbca..e43458673afb 100644
> --- a/drivers/clk/at91/sama7g5.c
> +++ b/drivers/clk/at91/sama7g5.c
> @@ -302,6 +302,7 @@ static const struct {
>   * @ep_count:		extra parents count
>   * @ep_mux_table:	mux table for extra parents
>   * @id:			clock id
> + * @eid:		export index in sama7g5->chws[] array
>   * @c:			true if clock is critical and cannot be disabled
>   */
>  static const struct {
> @@ -311,6 +312,7 @@ static const struct {
>  	u8 ep_count;
>  	u8 ep_mux_table[4];
>  	u8 id;
> +	u8 eid;
>  	u8 c;
>  } sama7g5_mckx[] = {
>  	{ .n = "mck1",
> @@ -319,6 +321,7 @@ static const struct {
>  	  .ep_mux_table = { 5, },
>  	  .ep_count = 1,
>  	  .ep_chg_id = INT_MIN,
> +	  .eid = PMC_MCK1,
>  	  .c = 1, },
>  
>  	{ .n = "mck2",
> @@ -913,7 +916,7 @@ static void __init sama7g5_pmc_setup(struct device_node *np)
>  	if (IS_ERR(regmap))
>  		return;
>  
> -	sama7g5_pmc = pmc_data_allocate(PMC_CPU + 1,
> +	sama7g5_pmc = pmc_data_allocate(PMC_MCK1 + 1,
>  					nck(sama7g5_systemck),
>  					nck(sama7g5_periphck),
>  					nck(sama7g5_gck), 8);
> @@ -1027,6 +1030,9 @@ static void __init sama7g5_pmc_setup(struct device_node *np)
>  			goto err_free;
>  
>  		alloc_mem[alloc_mem_size++] = mux_table;
> +
> +		if (sama7g5_mckx[i].eid)
> +			sama7g5_pmc->chws[sama7g5_mckx[i].eid] = hw;
>  	}
>  
>  	hw = at91_clk_sama7g5_register_utmi(regmap, "utmick", "main_xtal");
> diff --git a/include/dt-bindings/clock/at91.h b/include/dt-bindings/clock/at91.h
> index 98e1b2ab6403..8498c0cd95fe 100644
> --- a/include/dt-bindings/clock/at91.h
> +++ b/include/dt-bindings/clock/at91.h
> @@ -35,6 +35,7 @@
>  #define PMC_AUDIOIOPLL		(PMC_MAIN + 7)
>  #define PMC_ETHPLL		(PMC_MAIN + 8)
>  #define PMC_CPU			(PMC_MAIN + 9)
> +#define PMC_MCK1		(PMC_MAIN + 10)
>  
>  #ifndef AT91_PMC_MOSCS
>  #define AT91_PMC_MOSCS		0		/* MOSCS Flag */