linux-kernel - Re: [PATCH 1/3] i2c-axxia: dedicated function to set client addr

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Date:   Tue, 11 Dec 2018 12:00:15 +0000
From:   "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@...ia.com>
To:     "Adamski, Krzysztof (Nokia - PL/Wroclaw)" 
        <krzysztof.adamski@...ia.com>, Wolfram Sang <wsa@...-dreams.de>
CC:     "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Tobias Jordan <Tobias.Jordan@...ktrobit.com>,
        Peter Rosin <peda@...ntia.se>
Subject: Re: [PATCH 1/3] i2c-axxia: dedicated function to set client addr

Hi!

On 10/12/2018 16:00, Adamski, Krzysztof (Nokia - PL/Wroclaw) wrote:
> This patch moves configuration of hardware registers used for setting
> i2c client address to separate function. It is preparatory change for
> next commit.

Reviewed-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>

> Signed-off-by: Krzysztof Adamski <krzysztof.adamski@...ia.com>
> ---
>  drivers/i2c/busses/i2c-axxia.c | 29 ++++++++++++++++++-----------
>  1 file changed, 18 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-axxia.c b/drivers/i2c/busses/i2c-axxia.c
> index 51d34959709b..d37caf694fbf 100644
> --- a/drivers/i2c/busses/i2c-axxia.c
> +++ b/drivers/i2c/busses/i2c-axxia.c
> @@ -337,17 +337,9 @@ static irqreturn_t axxia_i2c_isr(int irq, void *_dev)
>  	return IRQ_HANDLED;
>  }
>  
> -static int axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
> +static void axxia_i2c_set_addr(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
>  {
> -	u32 int_mask = MST_STATUS_ERR | MST_STATUS_SNS;
> -	u32 rx_xfer, tx_xfer;
>  	u32 addr_1, addr_2;
> -	unsigned long time_left;
> -	unsigned int wt_value;
> -
> -	idev->msg = msg;
> -	idev->msg_xfrd = 0;
> -	reinit_completion(&idev->msg_complete);
>  
>  	if (i2c_m_ten(msg)) {
>  		/* 10-bit address
> @@ -367,6 +359,23 @@ static int axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
>  		addr_2 = 0;
>  	}
>  
> +	writel(addr_1, idev->base + MST_ADDR_1);
> +	writel(addr_2, idev->base + MST_ADDR_2);
> +}
> +
> +static int axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
> +{
> +	u32 int_mask = MST_STATUS_ERR | MST_STATUS_SNS;
> +	u32 rx_xfer, tx_xfer;
> +	unsigned long time_left;
> +	unsigned int wt_value;
> +
> +	idev->msg = msg;
> +	idev->msg_xfrd = 0;
> +	reinit_completion(&idev->msg_complete);
> +
> +	axxia_i2c_set_addr(idev, msg);
> +
>  	if (i2c_m_rd(msg)) {
>  		/* I2C read transfer */
>  		rx_xfer = i2c_m_recv_len(msg) ? I2C_SMBUS_BLOCK_MAX : msg->len;
> @@ -379,8 +388,6 @@ static int axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
>  
>  	writel(rx_xfer, idev->base + MST_RX_XFER);
>  	writel(tx_xfer, idev->base + MST_TX_XFER);
> -	writel(addr_1, idev->base + MST_ADDR_1);
> -	writel(addr_2, idev->base + MST_ADDR_2);
>  
>  	if (i2c_m_rd(msg))
>  		int_mask |= MST_STATUS_RFL;

-- 
Best regards,
Alexander Sverdlin.