linux-kernel - Re: [Linux-stm32] [PATCH] mfd: stmpe: Support disabling sub-functions

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Date:   Sat, 26 Dec 2020 16:50:17 +0100
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Oleksandr Suvorov <oleksandr.suvorov@...adex.com>,
        linux-next@...r.kernel.org
Cc:     Igor Opaniuk <igor.opaniuk@...adex.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        linux-kernel@...r.kernel.org,
        Philippe Schenker <philippe.schenker@...adex.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [Linux-stm32] [PATCH] mfd: stmpe: Support disabling sub-functions

Hello Oleksander,

On 26.12.20 10:47, Oleksandr Suvorov wrote:
> Add support of sub-functions disabling. It allows one to define
> an stmpe sub-function device in devicetree, but keep it disabled.
> 
> Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
> ---
> 
>  drivers/mfd/stmpe.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
> index 90f3292230c9..2182607b75f6 100644
> --- a/drivers/mfd/stmpe.c
> +++ b/drivers/mfd/stmpe.c
> @@ -1358,6 +1358,9 @@ static void stmpe_of_probe(struct stmpe_platform_data *pdata,
>  	pdata->autosleep = (pdata->autosleep_timeout) ? true : false;
>  
>  		(np, child) {
> +		/* skip disabled sub-function */
> +		if (!of_device_is_available(child))
> +			continue;

Better use for_each_available_child_of_node().

>  		if (of_node_name_eq(child, "stmpe_gpio")) {
>  			pdata->blocks |= STMPE_BLOCK_GPIO;
>  		} else if (of_node_name_eq(child, "stmpe_keypad")) {
> 

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