Messages in this thread | | | From | Benjamin Gaignard <> | Date | Tue, 20 Nov 2018 09:38:30 +0100 | Subject | Re: [PATCH 2/3] pinctrl: stm32: protect configuration registers with a hwspinlock |
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Le lun. 19 nov. 2018 à 13:20, Linus Walleij <linus.walleij@linaro.org> a écrit : > > On Tue, Nov 13, 2018 at 10:51 AM Benjamin Gaignard > <benjamin.gaignard@linaro.org> wrote: > > > If a hwspinlock if defined in device tree use it to protect > > configuration registers. > > > > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> > > Patch applied with Alex' ACK.
Thanks
> > Out of curiosity: what is it protecting against? > I would guess simultaneous access from another CPU > but the commit doesn't say. > > Simultaneous access from two CPUs makes it extra important > that all register access is read-modify-write, so I'd have a second > check over the code to make sure this is the case.
Yes it is to protect configuration registers from being used at the same by cortexA and cortexM.
> > Yours, > Linus Walleij
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