On 20/03/17 14:14, Thierry Reding wrote:
> * PGP Signed by an unknown key
>
> On Wed, Mar 15, 2017 at 01:31:53PM +0000, Jon Hunter wrote:
> [...]
>> +static int __init tegra_flowctrl_init(void)
>> +{
>> + /* hardcoded fallback if device tree node is missing */
>> + unsigned long base = 0x60007000;
>> + unsigned long size = SZ_4K;
>> + struct device_node *np;
>> +
>> + if (!soc_is_tegra())
>> + return 0;
>> +
>> + np = of_find_matching_node(NULL, matches);
>> + if (np) {
>> + struct resource res;
>> +
>> + if (of_address_to_resource(np, 0, &res) == 0) {
>> + size = resource_size(&res);
>> + base = res.start;
>> + }
>> +
>> + of_node_put(np);
>> + }
>> +
>> + tegra_flowctrl_base = ioremap_nocache(base, size);
>> +
>> + if (!tegra_flowctrl_base)
>> + return -ENXIO;
>> +
>> + return 0;
>> +}
>> +early_initcall(tegra_flowctrl_init);
>
> Do we want to implement a hand-off to a proper driver at some point,
> similar to what we have for PMC?
Yes I can add, it won't do much apart from remap the io-space, but at
least it is registered as a device then.
>> diff --git a/include/soc/tegra/flowctrl.h b/include/soc/tegra/flowctrl.h
> [...]
>> +#ifndef __ASSEMBLY__
>> +u32 flowctrl_read_cpu_csr(unsigned int cpuid);
>> +void flowctrl_write_cpu_csr(unsigned int cpuid, u32 value);
>> +void flowctrl_write_cpu_halt(unsigned int cpuid, u32 value);
>> +
>> +void flowctrl_cpu_suspend_enter(unsigned int cpuid);
>> +void flowctrl_cpu_suspend_exit(unsigned int cpuid);
>> +#endif
>
> Perhaps we want the same type of dummy functions scheme here for
> !SOC_TEGRA_FLOWCTRL that Arnd proposed for !SOC_TEGRA_PMC?
Yes that is a better solution, so will do the same here.
Jon
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