From 7f70ad610b23ef389c73b61a73d0920b77da4460 Mon Sep 17 00:00:00 2001 From: Julius Werner Date: Mon, 9 Feb 2015 17:40:58 -0800 Subject: rk3288: Add software I2C support This patch adds the necessary platform glue to allow the use of software-driven I2C bit banging on the RK3288. This is just a debugging feature that can be used to reproduce certain I2C failure cases. Also fix Makefile verstage linking for the feature and add some new rk3288 IOMUX macros as needed. BRANCH=None BUG=None TEST=Added "CONFIG_SOFTWARE_I2C=y" to configs/config.veyron_jerry, wrapped Jerry's bootblock and verstage in software_i2c_attach/detach() calls, confirmed that both PMIC and TPM could be driven correctly with software I2C driver. Tried out different combinations of software_i2c_wedge_ack() and software_i2c_wedge_read() on the PMIC and observed transfer results with the hardware controller after reboot... the worst that would happen is that the first register read-modify-write (DCDC_ILMAX) would fail to read, but all later transfers would be fine. Since that register is written twice (due to current BUCK1 ramp implementation) and is not terribily important anyway, I think we don't need to worry about wedging problems. Change-Id: Iba801ee61d30fb1fd3aef8300612c67fa50c441b Signed-off-by: Patrick Georgi Original-Commit-Id: 24dfca9bab38a20c40ef0c2dd4c775b8d8f47487 Original-Change-Id: I96777300a57c85471bad20e23a455551e9970222 Original-Signed-off-by: Julius Werner Original-Reviewed-on: https://chromium-review.googlesource.com/247890 Original-Reviewed-by: Aaron Durbin Reviewed-on: http://review.coreboot.org/9757 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/device/Makefile.inc | 1 + 1 file changed, 1 insertion(+) (limited to 'src/device/Makefile.inc') diff --git a/src/device/Makefile.inc b/src/device/Makefile.inc index 8c9ba5de05..a955bb4350 100644 --- a/src/device/Makefile.inc +++ b/src/device/Makefile.inc @@ -25,5 +25,6 @@ subdirs-y += oprom dram ramstage-$(CONFIG_VGA_ROM_RUN) += pci_rom.c bootblock-$(CONFIG_SOFTWARE_I2C) += software_i2c.c +verstage-$(CONFIG_SOFTWARE_I2C) += software_i2c.c romstage-$(CONFIG_SOFTWARE_I2C) += software_i2c.c ramstage-$(CONFIG_SOFTWARE_I2C) += software_i2c.c -- cgit v1.2.3