W dniu 24 września 2010 17:38 użytkownik Cory Maccarrone
<darkstar6262@xxxxxxxxx> napisał:
> 2010/9/24 Michał Mirosław <mirqus@xxxxxxxxx>:
>> 2010/8/18 Cory Maccarrone <darkstar6262@xxxxxxxxx>:
>>> 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@xxxxxxxxx>
>>> ---
>> [...]
>>> +/* 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
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