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ARM: imx25-pinfunc: document SION being important for MX25_PAD_SD1_CMD__SD1_CMD

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Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Uwe Kleine-König 2016-06-13 12:17:54 +02:00 committed by Shawn Guo
parent 6f0808c482
commit da4fa6fa80
1 changed files with 9 additions and 0 deletions
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9
arch/arm/boot/dts/imx25-pinfunc.h
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@ -421,6 +421,15 @@
#define MX25_PAD_UART2_CTS__FEC_RX_ERR 0x18c 0x384 0x518 0x12 0x002
#define MX25_PAD_UART2_CTS__GPIO_4_29 0x18c 0x384 0x000 0x15 0x000
/*
* Removing the SION bit from MX25_PAD_SD1_CMD__SD1_CMD breaks detecting an SD
* card. According to the i.MX25 reference manual (e.g. Figure 23-2 in IMX25RM
* Rev. 2 from 01/2011) this pin is bidirectional. So it seems to be a silicon
* bug that configuring the SD1_CMD function doesn't enable the input path for
* this pin.
* This might have side effects for other hardware units that are connected to
* that pin and use the respective function as input.
*/
#define MX25_PAD_SD1_CMD__SD1_CMD 0x190 0x388 0x000 0x10 0x000
#define MX25_PAD_SD1_CMD__CSPI2_MOSI 0x190 0x388 0x4a0 0x11 0x001
#define MX25_PAD_SD1_CMD__FEC_RDATA2 0x190 0x388 0x50c 0x12 0x002