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Date:   Tue, 9 Aug 2022 19:10:48 +0200
From:   Andrew Lunn <>
To:     Ravi Gunasekaran <>
Subject: Re: [EXTERNAL] Re: [RESEND PATCH] net: ethernet: ti: davinci_mdio:
 Add workaround for errata i2329

> Thanks for reviewing the patch. Since mdiobb_{read,write}() are exported, I
> can invoke these in my mdio read/write implementation. I will rework and
> send the v2 patch

What you should do is fill a struct mdiobb_ops and pass it to
alloc_mdio_bitbang(). It looks like you can provide:

struct mdiobb_ops {
	struct module *owner;

	/* Set the Management Data Clock high if level is one,
	 * low if level is zero.
	void (*set_mdc)(struct mdiobb_ctrl *ctrl, int level);

	/* Configure the Management Data I/O pin as an input if
	 * "output" is zero, or an output if "output" is one.
	void (*set_mdio_dir)(struct mdiobb_ctrl *ctrl, int output);

	/* Set the Management Data I/O pin high if value is one,
	 * low if "value" is zero.  This may only be called
	 * when the MDIO pin is configured as an output.
	void (*set_mdio_data)(struct mdiobb_ctrl *ctrl, int value);

	/* Retrieve the state Management Data I/O pin. */
	int (*get_mdio_data)(struct mdiobb_ctrl *ctrl);

Look at ravb_mdio_init() for an example, and there are a few others.


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