"Varadarajan, Charulatha" <ch...@ti.com> writes:
> Sanjeev,
>
> With GPIO hwmod series, OMAP3EVM board is not up with DHCP + nfs root.
> This issue was reported by Kevin.
>
> The root cause of this issue is that during OMAP3EVM board init, the
> Ethernet controller (smsc911x) is not reset and it relies on the uboot
> configurations for it's operations. The reset GPIO pin used for this
> purpose is not even reserved.
>
> After gpio hmwod series are merged, this patch is required to make the
> EVM board working. Also omap3evm_init_smsc911x() needs to be fixed
> including CS settings and other required settings for Ethernet controller.
>
> Links to related discussions:
> http://www.spinics.net/lists/linux-omap/msg37234.html
> http://www.spinics.net/lists/linux-omap/msg36698.html
> http://www.spinics.net/lists/linux-omap/msg36799.html
>
> The below patch is tested on OMAP3 EVM board (ES3.1).
Also note that the patch below didn't work on my EVM (ES2.1), making me
assume that it uses a different GPIO for older boards.
Kevin
>
>
>> -----Original Message-----
>> From: Varadarajan, Charulatha
>> Sent: Saturday, September 25, 2010 5:07 PM
>> To: linux-omap@vger.kernel.org
>> Cc: khil...@deeprootsystems.com; t...@atomide.com; Premi, Sanjeev;
>> Varadarajan, Charulatha
>> Subject: [PATCH RFC:] FIX: OMAP3EVM: Ethernet controller smsc911x reset
>>
>> Do reset of Ethernet controller smsc911x using OMAP gpio7
>> while initializing the Ethernet controller.
>>
>> Signed-off-by: Charulatha V <ch...@ti.com>
>> ---
>> arch/arm/mach-omap2/board-omap3evm.c | 16 ++++++++++++++++
>> 1 files changed, 16 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/arm/mach-omap2/board-omap3evm.c b/arch/arm/mach-
>> omap2/board-omap3evm.c
>> index f76d9c0..54a7e20 100644
>> --- a/arch/arm/mach-omap2/board-omap3evm.c
>> +++ b/arch/arm/mach-omap2/board-omap3evm.c
>> @@ -55,6 +55,7 @@
>> #define OMAP3EVM_ETHR_SIZE 1024
>> #define OMAP3EVM_ETHR_ID_REV 0x50
>> #define OMAP3EVM_ETHR_GPIO_IRQ 176
>> +#define OMAP3EVM_ETHR_GPIO_RST 7
>> #define OMAP3EVM_SMSC911X_CS 5
>>
>> static u8 omap3_evm_version;
>> @@ -134,6 +135,20 @@ static inline void __init
>> omap3evm_init_smsc911x(void)
>> else
>> rate = clk_get_rate(l3ck);
>>
>> + /* Configure ethernet controller reset gpio */
>> + if (gpio_request(OMAP3EVM_ETHR_GPIO_RST, "SMSC911x gpio") < 0) {
>> + pr_err(KERN_ERR "Failed to request GPIO8 for smsc911x
>> gpio\n");
>> + return;
>> + }
>> +
>> + gpio_direction_output(OMAP3EVM_ETHR_GPIO_RST, 1);
>> +
>> + /* reset pulse to ethernet controller*/
>> + gpio_set_value(OMAP3EVM_ETHR_GPIO_RST, 0);
>> + usleep_range(150, 220);
>> + gpio_set_value(OMAP3EVM_ETHR_GPIO_RST, 1);
>> + usleep_range(1, 2);
>> +
>> if (gpio_request(OMAP3EVM_ETHR_GPIO_IRQ, "SMSC911x irq") < 0) {
>> printk(KERN_ERR "Failed to request GPIO%d for smsc911x IRQ\n",
>> OMAP3EVM_ETHR_GPIO_IRQ);
>> --
>> 1.7.0.4
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