On 09/01/2016 02:24 AM, Stephen Boyd wrote:
On 08/31/2016 03:52 AM, Archit Taneja wrote:
On the APQ8016 SBC, the LDO2 PM8916 regulator feeds 1.2V to the following:
- VDDA_1P2_MIPI_DSI and VDDA_MIPI_CSI pins on APQ8016.
- VCCCAD pins on the LPDDR3 chip.
- VDDPX_1 pins on APQ8016.
The LDO6 regulator feeds 1.8V to:
- VDAA_MIPI_DSI0_PLL pin on APQ8016.
- QFPROM_BLOW_VDD pin on PM8916.
- The AVDD, A2VDD and DVDD pins on ADV7533 bridge.
The LDO17 regulator feeds 3.3V to:
- The V3P3 pin on ADV7533 bridge.
Currently, the regulator min/max voltages for all the LDOs are set to the
range of what the PMIC supports. Set the ranges for L2, L6 and L17 to what
we need, i.e. 1.2V, 1.8V and 3.3V respectively.
Why doesn't the consuming driver request a particular voltage on these
LDOs? It doesn't seem correct to modify board constraints to satisfy a
consumer (even if that consumer is on the board).
Mark Brown suggested that drivers setting only a single voltage should
specify the constrains via board files, etc:
https://patchwork.freedesktop.org/patch/78789/
Archit
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