[qcom-next] arm: dts: talos: Disable SD card controller

[balajiselvanathan]

The Talos EVK does not have SD card support. So, disable the sdhc_2 node in the U-Boot device tree to prevent unnecessary initialization attempts and eliminate boot warnings.

[b49020]

@balajiselvanathan can you check why the Linux DT enabled it in first place if it's not supported? I guess we might be missing something.

[balajiselvanathan]

Hi Sumit, I meant in uboot sd card is not yet supported.

[b49020]

Hi Sumit, I meant in uboot sd card is not yet supported.

I suppose only clk settings might be missing like you did for Lemans. Can you rather properly fix it?

[balajiselvanathan]

Hi Sumit, I meant in uboot sd card is not yet supported.

I suppose only clk settings might be missing like you did for Lemans. Can you rather properly fix it?

I had added the clk settings, but getting this warning log during boot:
"Warning: RCG ... stuck at off " for SDCC2_APPS_CLK's set_rate. Upon debugging, found that it is setting UPDATE bit (bit 0) of GCC_SDCC1_APPS_CMD_RCGR reg (after configuring GCC_SDCC1_APPS_CFG_RCGR reg), but hw is not clearing the set bit, leading to timeout and "stuck at off" warning log. So had assumed that the PLLs to the RCG are not enabled.

[b49020]

Hi Sumit, I meant in uboot sd card is not yet supported.

I suppose only clk settings might be missing like you did for Lemans. Can you rather properly fix it?

I had added the clk settings, but getting this warning log during boot: "Warning: RCG ... stuck at off " for SDCC2_APPS_CLK's set_rate. Upon debugging, found that it is setting UPDATE bit (bit 0) of GCC_SDCC1_APPS_CMD_RCGR reg (after configuring GCC_SDCC1_APPS_CFG_RCGR reg), but hw is not clearing the set bit, leading to timeout and "stuck at off" warning log. So had assumed that the PLLs to the RCG are not enabled.

Let's have a proper fix for the SD clocks instead of a DT workaround. The warning can be ignored by the user as it's not functional currently.