netdev - Re: [PATCH net-next 1/3] net: ethernet: mediatek: get the chip id by ETHDMASYS registers

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Date:   Mon, 3 Oct 2016 21:17:02 +0200
From:   John Crispin <john@...ozen.org>
To:     Nelson Chang <nelson.chang@...iatek.com>, davem@...emloft.net
Cc:     nbd@...nwrt.org, netdev@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, nelsonch.tw@...il.com
Subject: Re: [PATCH net-next 1/3] net: ethernet: mediatek: get the chip id by
 ETHDMASYS registers

Hi Nelson,

comments inline

On 03/10/2016 09:18, Nelson Chang wrote:
> The driver gets the chip id by ETHSYS_CHIPID0_3/ETHSYS_CHIPID4_7 registers
> in mtk_probe().
> 
> Signed-off-by: Nelson Chang <nelson.chang@...iatek.com>
> ---
>  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 27 +++++++++++++++++++++++++++
>  drivers/net/ethernet/mediatek/mtk_eth_soc.h |  5 +++++
>  2 files changed, 32 insertions(+)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index ad4ab97..a3e4ae6 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -2323,6 +2323,27 @@ free_netdev:
>  	return err;
>  }
>  
> +static u32 mtk_get_chip_id(struct mtk_eth *eth)
> +{
> +	u32 val[2], id[4];
> +	u32 chip_id;
> +
> +	regmap_read(eth->ethsys, ETHSYS_CHIPID0_3, &val[0]);
> +	regmap_read(eth->ethsys, ETHSYS_CHIPID4_7, &val[1]);
> +
> +	id[3] = ((val[0] >> 16) & 0xff) - '0';
> +	id[2] = ((val[0] >> 24) & 0xff) - '0';
> +	id[1] = (val[1] & 0xff) - '0';
> +	id[0] = ((val[1] >> 8) & 0xff) - '0';
> +
> +	chip_id = (id[3] * 1000) + (id[2] * 100) +
> +		  (id[1] * 10) + id[0];
> +
> +	dev_info(eth->dev, "chip id = %d\n", chip_id);

the chip id is printed here

> +	return chip_id;
> +}
> +
>  static int mtk_probe(struct platform_device *pdev)
>  {
>  	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -2388,6 +2409,12 @@ static int mtk_probe(struct platform_device *pdev)
>  	if (err)
>  		return err;
>  
> +	eth->chip_id = mtk_get_chip_id(eth);
> +	if (!eth->chip_id) {
> +		dev_err(&pdev->dev, "failed to get chip id\n");
> +		return -ENODEV;
> +	}
> +

and the error check happens here. maybe you could move the dev_err to
the above function.

	John

>  	for_each_child_of_node(pdev->dev.of_node, mac_np) {
>  		if (!of_device_is_compatible(mac_np,
>  					     "mediatek,eth-mac"))
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
> index 3003195..a5b422b 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
> @@ -342,6 +342,10 @@
>  #define GPIO_BIAS_CTRL		0xed0
>  #define GPIO_DRV_SEL10		0xf00
>  
> +/* ethernet subsystem chip id register */
> +#define ETHSYS_CHIPID0_3	0x0
> +#define ETHSYS_CHIPID4_7	0x4
> +
>  /* ethernet subsystem config register */
>  #define ETHSYS_SYSCFG0		0x14
>  #define SYSCFG0_GE_MASK		0x3
> @@ -534,6 +538,7 @@ struct mtk_eth {
>  	unsigned long			sysclk;
>  	struct regmap			*ethsys;
>  	struct regmap			*pctl;
> +	u32				chip_id;
>  	bool				hwlro;
>  	atomic_t			dma_refcnt;
>  	struct mtk_tx_ring		tx_ring;
>