Hi Geert,
On Friday, May 12, 2017, Geert Uytterhoeven wrote:
> 12 x 16 = 192, not 384.
Opps, my math was off!
(I think I need another cup of coffee this morning)
> Do you need all possible combinations of input, output, and bi-dir?
> I assumed they're mutually exclusive. If not, you need 3 bits/pin/function
You're right, they are mutually exclusive, so 2 bits are fine.
Also, the other pinout variations chips (RZ/A1L,A1LU,A1LC) only have 10 ports:
12 ports x 16 pins x 2bits-per-bit => 384 bytes
10 ports x 16 pins x 2bits-per-bit => 320 bytes
384 + 320 = 704 bytes (of const data)
> With packages, do you mean e.g. RZ/A1H vs. RZ/A1L?
Yes.
> These indeed differ,
> but
> should use different compatible values.
OK. Since r7s72100.dtsi has
compatible = "renesas,r7s72100-ports";
We'll just override that in say my-rza1l-board.dts
&pinctrl {
compatible = "renesas,r7s72102-ports";
};
and then look for that in the driver.
> Or do you mean QFP/BGA256 vs. BGA324? Isn't the former a subset of the
> latter?
The "package" doesn't matter, it's the pin assignments on the die:
RZ/A1H = RZ/A1M = pin assignments #1
RZ/A1L = RZ/A1LU = RZ/A1LC = pin assignments #2
Then each of those parts above have multiple 'package options', but of
course doesn't change the actual pin/function assignments (that's part
of the silicon die)
Chris
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