[PATCH 2/2] U300 AB3100 boardinfo

2009/8/31 Mark Brown [off-list ref]:

On Sun, 2009-08-30 at 23:30 +0200, Linus Walleij wrote:

quoted

?arch/arm/mach-u300/Makefile ? ?| ? ?1 +
?arch/arm/mach-u300/i2c.c ? ? ? | ?304 ++++++++++++++++++++++++++++++++++++++++
?arch/arm/mach-u300/regulator.c | ?150 ++++++++++++++++++++

Is mach-u300 for all machines with a given processor or is it for a
specific system?

It is a series of systems (U330, U365, U335) but they all feature the same
connections and rails to the AB3100 circuit so regulator-wise they are
identical.

quoted

+static struct regulator_consumer_supply supply_ldo_c[] = {
+ ? ? {
+ ? ? ? ? ? ? .dev_name = "ab3100-codec",
+ ? ? ? ? ? ? .supply = "vaudio", /* Powers the codec */
+ ? ? },
+};

Does the CODEC really take a single supply called vaudio or are there
several inputs to the CODEC?

It's only one actually.

quoted

+ ? ? ? ? ? ? /* Buck converter in sleep mode routing and constraints */
+ ? ? ? ? ? ? {
+ ? ? ? ? ? ? ? ? ? ? .constraints = {
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? .min_uV = 0,
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? .max_uV = 1800000,
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? .valid_modes_mask = REGULATOR_MODE_NORMAL,
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? .valid_ops_mask =
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? REGULATOR_CHANGE_VOLTAGE |
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? REGULATOR_CHANGE_STATUS,
+ ? ? ? ? ? ? ? ? ? ? },
+ ? ? ? ? ? ? ? ? ? ? .num_consumer_supplies = ARRAY_SIZE(supply_buck_sleep),
+ ? ? ? ? ? ? ? ? ? ? .consumer_supplies = supply_buck_sleep,
+ ? ? ? ? ? ? },

Hrm, I didn't pick this up when reading the regulator driver but does
this mean that you're registering two different regulators for the same
buck convertor?

Yeah I did. So I removed the sleep mode "regulators" and added
the set_suspend_voltage() hook instead. Works like a charm.

quoted

+/*
+ * Hog the regulators needed to power up the board.
+ */
+static int __init u300_init_boardpower(void)
+{
+ ? ? int err;
+ ? ? u32 val;
+
+ ? ? pr_info("U300: setting up board power\n");
+ ? ? radio_power = regulator_get(NULL, "vrad");
+ ? ? if (IS_ERR(radio_power)) {
+ ? ? ? ? ? ? pr_err("could not get vrad\n");
+ ? ? ? ? ? ? return PTR_ERR(radio_power);
+ ? ? }
+ ? ? err = regulator_enable(radio_power);
+ ? ? if (err) {
+ ? ? ? ? ? ? pr_err("could not enable vrad\n");
+ ? ? ? ? ? ? return err;
+ ? ? }

This all looks like it can be supported with the existing constraints
code; look at boot_on and always_on. Normally the only thing that should
need deviceless supplies like you have here is cpufreq (due to the fact
that there's no struct device available for cpufreq to use).

I switched to using always_on and boot_on and it's just as good.
Though I kept one of them: vana15, because disabling that
regulator is what I use for shutdown hook for the system.

Thanks for all the great comments Mark, v3 is due in a minute.

Yours,
Linus Walleij