linux-kernel - Re: [PATCH v3 3/3] i2c-ocores: sifive: add polling mode workaround for FU540-C000 SoC

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Message-ID: <20190516123120.GB14298@lunn.ch>
Date:   Thu, 16 May 2019 14:31:20 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Sagar Shrikant Kadam <sagar.kadam@...ive.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, peter@...sgaard.com,
        palmer@...ive.com, paul.walmsley@...ive.com,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] i2c-ocores: sifive: add polling mode workaround
 for FU540-C000 SoC

> @@ -682,13 +693,24 @@ static int ocores_i2c_probe(struct platform_device *pdev)
>  
>  	irq = platform_get_irq(pdev, 0);
>  	if (irq == -ENXIO) {
> -		i2c->flags |= OCORES_FLAG_POLL;
> +		/*
> +		 * Set a OCORES_FLAG_BROKEN_IRQ to enable workaround for
> +		 * FU540-C000 SoC in polling mode interface of i2c-ocore driver.
> +		 * Else enable default polling mode interface for SIFIVE/OCORE
> +		 * device types.
> +		 */
> +		match = of_match_node(ocores_i2c_match, pdev->dev.of_node);
> +		if (match && (long)match->data ==
> +				(TYPE_SIFIVE_REV0 | OCORES_FLAG_BROKEN_IRQ))

This looks wrong. You added:

+       {
+               .compatible = "sifive,fu540-c000-i2c",
+               .data = (void *)TYPE_SIFIVE_REV0,
+       },
+       {
+               .compatible = "sifive,i2c0",
+               .data = (void *)TYPE_SIFIVE_REV0,
+       },

So match->data just has TYPE_SIFIVE_REV0.

> +			i2c->flags |= OCORES_FLAG_BROKEN_IRQ;
> +		else
> +			i2c->flags |= OCORES_FLAG_POLL;

These two don't need to be exclusive. It makes more sense to say
SIFIVE needs to poll and it its IRQ is broken. A lot of your other
changes then go away.

       Andrew