Hi all,
While trying to understand the voltage layer, i have few comments and
doubts. This is not a comprehensive list, but for starters:
1) Functions omap3_voltage_read_reg(), omap3_voltage_write_reg()
which in turn call omap2_prm_read_mod_reg and omap2_prm_write_mod_reg()
These functions are always called via function pointer contained
in "omap_vdd_info".
What is the need for additional layer?
shouldn't be just do the following:
vdd->read_reg = omap2_prm_read_mod_reg ;
vdd->write_reg = omap2_prm_write_mod_reg ;
Same holds good for similar functions for OMAP4.
2) Structure omap_volt_data is used to describe the nominal voltage
for each OPP, However, presence of sr_efuse_offs, sr_errminlimit,
vp_errgain make assumptions on presence of SmartReflex and VP.
Value "0" to these fields cannot safely be used to indicate the
"not used" status - esp for sr_xx fields.
Shouldn't we delink them. something like:
struct omap_volt_data {
u32 volt_nominal;
u8 vp_errgain; /* Assuming that value "0" is equiv to "not used" */
struct volt_sr_data* sr_data;
}
3) Struct "omap_volt_pmic_info" should be trimmed to keep only PMIC
related info. Will make it easier to add support for other PMICs.
Suggestion:
struct omap_pmic_info {
int slew_rate;
int step_size;
u8 i2c_slave_addr;
u8 pmic_reg;
struct omap_pmic_extra_info * extra;
unsigned long (*vsel_to_uv) (const u8 vsel);
u8 (*uv_to_vsel) (unsigned long uV);
};
BTW, what does the PMIC register indicate? target addr on PMIC?
/* Not all PMICs would be able to support these features */
struct omap_pmic_extra_info {
u32 on_volt;
u32 onlp_volt;
u32 ret_volt;
u32 off_volt;
};
"extra" is just random name, even "aux" standing for "auxilliary"
should do.
struct omap_vp_info { /* just random name for this mail only */
u8 vp_erroroffset;
u8 vp_vstepmin;
u8 vp_vstepmax;
u8 vp_vddmin;
u8 vp_vddmax;
u8 vp_timeout_us;
};
Can this/ Should this be combined with an existing structure?
e.g. omap_vp_common_data?
I have some work-in-progress changes. Based on the responses, i will
tailor them and send across tomorrow.
Best regards,
Sanjeev
(folks in cc: sorry for resend. Original mail in
was mistakenly sent in HTML format;
and not delivered to the list)
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