[patch v4 01/10] efikamx: read board id

From: marek.vasut@gmail.com (Marek Vasut)
To: linux-arm-kernel@lists.infradead.org
Subject: [patch v4 01/10] efikamx: read board id
Date: Sat, 30 Oct 2010 09:48:51 +0200	[thread overview]
Message-ID: <201010300948.51143.marek.vasut@gmail.com> (raw)
In-Reply-To: <20101027124340.156430559@rtp-net.org>

On Wednesday 27 October 2010 14:40:46 Arnaud Patard wrote:
> read board id value from the GPIO3_16/17/11
> 
> Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
> Index: linux-2.6-submit/arch/arm/mach-mx5/board-mx51_efikamx.c
> ===================================================================

This is not git, is it ... what do you use to generate this stuff ?

> --- linux-2.6-submit.orig/arch/arm/mach-mx5/board-mx51_efikamx.c	2010-10-21
> 08:29:23.000000000 +0200 +++
> linux-2.6-submit/arch/arm/mach-mx5/board-mx51_efikamx.c	2010-10-21
> 08:29:46.000000000 +0200 @@ -39,12 +39,26 @@
> 
>  #define	MX51_USB_PLL_DIV_24_MHZ	0x01
> 
> +#define EFIKAMX_PCBID0		(2*32 + 16)
> +#define EFIKAMX_PCBID1		(2*32 + 17)
> +#define EFIKAMX_PCBID2		(2*32 + 11)
> +
> +/* the pci ids pin have pull up. they're driven low according to board id
> */ +#define MX51_PAD_PCBID0	IOMUX_PAD(0x518, 0x130, 3, 0x0,   0,
> PAD_CTL_PUS_100K_UP) +#define MX51_PAD_PCBID1	IOMUX_PAD(0x51C, 0x134, 3,
> 0x0,   0, PAD_CTL_PUS_100K_UP) +#define MX51_PAD_PCBID2	IOMUX_PAD(0x504,
> 0x128, 3, 0x0,   0, PAD_CTL_PUS_100K_UP) +
>  static struct pad_desc mx51efikamx_pads[] = {
>  	/* UART1 */
>  	MX51_PAD_UART1_RXD__UART1_RXD,
>  	MX51_PAD_UART1_TXD__UART1_TXD,
>  	MX51_PAD_UART1_RTS__UART1_RTS,
>  	MX51_PAD_UART1_CTS__UART1_CTS,
> +
> +	/* board id */
> +	MX51_PAD_PCBID0,
> +	MX51_PAD_PCBID1,
> +	MX51_PAD_PCBID2,
>  };
> 
>  /* Serial ports */
> @@ -92,10 +106,62 @@
>  	.flags  = MXC_EHCI_INTERNAL_PHY,
>  };
> 
> +/*   PCBID2  PCBID1 PCBID0  STATE
> +	1       1      1    ER1:rev1.1
> +	1       1      0    ER2:rev1.2
> +	1       0      1    ER3:rev1.3
> +	1       0      0    ER4:rev1.4
> +*/
> +static void __init mx51_efikamx_board_id(void)
> +{
> +	int id;
> +
> +	/* things are taking time to settle */
> +	msleep(150);
> +
> +	gpio_request(EFIKAMX_PCBID0, "pcbid0");
> +	gpio_direction_input(EFIKAMX_PCBID0);
> +	gpio_request(EFIKAMX_PCBID1, "pcbid1");
> +	gpio_direction_input(EFIKAMX_PCBID1);
> +	gpio_request(EFIKAMX_PCBID2, "pcbid2");
> +	gpio_direction_input(EFIKAMX_PCBID2);
> +
> +	id = gpio_get_value(EFIKAMX_PCBID0);
> +	id |= gpio_get_value(EFIKAMX_PCBID1) << 1;
> +	id |= gpio_get_value(EFIKAMX_PCBID2) << 2;
> +
> +	switch (id) {
> +	case 7:
> +		system_rev = 0x11;
> +		break;
> +	case 6:
> +		system_rev = 0x12;
> +		break;
> +	case 5:
> +		system_rev = 0x13;
> +		break;
> +	case 4:
> +		system_rev = 0x14;
> +		break;
> +	default:
> +		system_rev = 0x10;
> +		break;
> +	}
> +
> +	if ((system_rev == 0x10)
> +		|| (system_rev == 0x12)
> +		|| (system_rev == 0x14)) {
> +		printk(KERN_WARNING
> +			"EfikaMX: Unsupported board revision 1.%u!\n",
> +			system_rev & 0xf);

Use rather Unknown than Unsupported ... or make it sound more like a warning 
than like a utter crash.

Also, maybe you should free the GPIOs here again ?

> +	}
> +}
> +
>  static void __init mxc_board_init(void)
>  {
>  	mxc_iomux_v3_setup_multiple_pads(mx51efikamx_pads,
>  					ARRAY_SIZE(mx51efikamx_pads));
> +	mx51_efikamx_board_id();
>  	mxc_register_device(&mxc_usbdr_host_device, &dr_utmi_config);
>  	mxc_init_imx_uart();
>  }
> 
> 
> 
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