netdev - Re: [PATCH net-next v4 02/12] net: ethernet: oa_tc6: implement register write operation

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Message-ID: <20240429163630.GA516117@kernel.org>
Date: Mon, 29 Apr 2024 17:36:30 +0100
From: Simon Horman <horms@...nel.org>
To: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, saeedm@...dia.com, anthony.l.nguyen@...el.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	andrew@...n.ch, corbet@....net, linux-doc@...r.kernel.org,
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, devicetree@...r.kernel.org,
	horatiu.vultur@...rochip.com, ruanjinjie@...wei.com,
	steen.hegelund@...rochip.com, vladimir.oltean@....com,
	UNGLinuxDriver@...rochip.com, Thorsten.Kummermehr@...rochip.com,
	Pier.Beruto@...emi.com, Selvamani.Rajagopal@...emi.com,
	Nicolas.Ferre@...rochip.com, benjamin.bigler@...nformulastudent.ch
Subject: Re: [PATCH net-next v4 02/12] net: ethernet: oa_tc6: implement
 register write operation

On Thu, Apr 18, 2024 at 06:26:38PM +0530, Parthiban Veerasooran wrote:
> Implement register write operation according to the control communication
> specified in the OPEN Alliance 10BASE-T1x MACPHY Serial Interface
> document. Control write commands are used by the SPI host to write
> registers within the MAC-PHY. Each control write commands are composed of
> a 32 bits control command header followed by register write data.
> 
> The MAC-PHY ignores the final 32 bits of data from the SPI host at the
> end of the control write command. The write command and data is also
> echoed from the MAC-PHY back to the SPI host to enable the SPI host to
> identify which register write failed in the case of any bus errors.
> Control write commands can write either a single register or multiple
> consecutive registers. When multiple consecutive registers are written,
> the address is automatically post-incremented by the MAC-PHY. Writing to
> any unimplemented or undefined registers shall be ignored and yield no
> effect.
> 
> Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>

...

> diff --git a/drivers/net/ethernet/oa_tc6.c b/drivers/net/ethernet/oa_tc6.c

...

> +/**
> + * oa_tc6_write_registers - function for writing multiple consecutive registers.
> + * @tc6: oa_tc6 struct.
> + * @address: address of the first register to be written in the MAC-PHY.
> + * @value: values to be written from the starting register address @address.
> + * @length: number of consecutive registers to be written from @address.
> + *
> + * Maximum of 128 consecutive registers can be written starting at @address.
> + *
> + * Returns 0 on success otherwise failed.

Nit: I think you need a ':' after "Returns" (or "Return")
     in order for kernel-doc -Wall to recognise this as a return section.

Likewise elsewhere in this patch(set).

> + */
> +int oa_tc6_write_registers(struct oa_tc6 *tc6, u32 address, u32 value[],
> +			   u8 length)
> +{

...