Re: linux rockchip gpio2b4 (gpio2b5) gpio2b7 broken GRF_GPIO2BL_IOMUX GRF_GPIO2BH_IOMUX 2bits 3bits pinctrl rk3328_mux_recalced_data (a fix exists, for a commiter brave enough to commit it)

antwain.schneider added an attachment on Kernel.org Bugzilla:

Created attachment 305795
a program written in c that can be compiled and ran on a rk3328-based device to illustrate the problem which is bad

this program dumps the bits set in the grf for 2bl and 2bh

in comment 7, the otp-out thing is still vital to prove this point without extensive dtb modification

i've got it down to this
fdtput -t x /boot/efi/rockchip/rk3328-roc-cc.dtb /pinctrl/tsadc/otp-out rockchip,pins 02 0d 02 5a
what's being changed in this line is the mode (from 1 to 2) of gpio2b5

otp-out in the rk3328.dtsi is
                                rockchip,pins = <2 RK_PB5 1 &pcfg_pull_none>;
which when dumped by dtc is
                                rockchip,pins = <0x02 0x0d 0x01 0x5a>;
0x5a is the phandle for pcfg_pull_none for me currently, your value may vary
notice that it's using gpio2b5 which exists but doesn't have a listing in chapter 3 of the trm but is described elsewhere in the document


1 run the program and save output
2 fdtput the dtb and reboot
3 run the program again and compare outputs, and notice how the completely wrong register changed

File: poc.c (text/x-csrc)
Size: 1.53 KiB
Link: https://bugzilla.kernel.org/attachment.cgi?id=305795
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a program written in c that can be compiled and ran on a rk3328-based device to illustrate the problem which is bad

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