W dniu 24 wrze?nia 2010 17:38 u?ytkownik Cory Maccarrone
[off-list ref] napisa?:

2010/9/24 Micha? Miros?aw [off-list ref]:

quoted

2010/8/18 Cory Maccarrone [off-list ref]:

quoted

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 <redacted>
---

[...]

quoted

+/* 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,
Micha? Miros?aw