[PATCH] [OMAP] HTCHERALD: MMC, I2C, HTCPLD, SPI, TSC2046

[Michał Mirosław]

W dniu 24 września 2010 17:38 użytkownik Cory Maccarrone
<darkstar6262 at gmail.com> napisał:
> 2010/9/24 Michał Mirosław <mirqus at gmail.com>:
>> 2010/8/18 Cory Maccarrone <darkstar6262 at gmail.com>:
>>> This change adds in MMC and I2C support to the HTC Herald board, as well
>>> as adding the HTCPLD driver for the PLD used on this phone.  It also
>>> adds in the gpio-keys entries for the front directional keys and
>>> selector and the cursor keys on the slide-out keyboard, and gpio-leds
>>> support for the LEDs attached to the htcpld.
>>>
>>> Additionally, SPI bus support (using the spi100k driver) and
>>> touchscreen support (using the ads7846 driver) were added.
>>>
>>> Signed-off-by: Cory Maccarrone <darkstar6262 at gmail.com>
>>> ---
>> [...]
>>> +/* MMC Card */
>>> +#if defined(CONFIG_MMC_OMAP) || defined(CONFIG_MMC_OMAP_MODULE)
>>> +static struct omap_mmc_platform_data htc_mmc1_data = {
>>> +       .nr_slots                       = 1,
>>> +       .switch_slot                    = NULL,
>>> +       .slots[0]       = {
>>> +               .ocr_mask               = MMC_VDD_28_29 | MMC_VDD_30_31 |
>>> +                                         MMC_VDD_32_33 | MMC_VDD_33_34,
>>> +               .name                   = "mmcblk",
>>> +               .nomux                  = 1,
>>> +               .wires                  = 4,
>>> +               .switch_pin             = -1,
>>> +       },
>>> +};
>> [...]
>> What voltages can this MMC controller provide? That's a rather unusual OCR mask.
> Not really sure, I wasn't the one who first came up with that mask.
> All I know is that it seems to work, and not just for my device, but
> lots of other HTC OMAP850 devices we've tried it on too.
>
> I'm interested though, what in particular makes it unusual?

It specifies, that device supports voltage ranges:
2.8V - 2.9V, 3.0V - 3.1V, 3.2V - 3.4V
(so: 2.9V - 3.0V and 3.1V - 3.2V are not available).
Are there really 2.8V, 3.0V, 3.3V VDDs settable?

If the host supports only VDD = 3.3V for example, then correct OCR
mask would be: MMC_VDD_32_33 | MMC_VDD_33_34 (or just one flag).

Best Regards,
Michał Mirosław