ARM: imx25-pinfunc: document SION being important for MX25_PAD_SD1_CMD__SD1_CMD (da4fa6fa) · Commits · 戴 / test

arch/arm/boot/dts/imx25-pinfunc.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -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