Hi Sergei,
On Thu, Mar 7, 2019 at 6:50 PM Sergei Shtylyov
<sergei.shtylyov@xxxxxxxxxxxxxxxxxx> wrote:
> On 01/28/2019 09:49 AM, Mason Yang wrote:
> > Add a driver for Renesas R-Car Gen3 RPC-IF SPI controller.
> >
> > Signed-off-by: Mason Yang <masonccyang@xxxxxxxxxxx>
> > Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
> [...]
> > diff --git a/drivers/spi/spi-renesas-rpc.c b/drivers/spi/spi-renesas-rpc.c
> > new file mode 100644
> > index 0000000..ea12017
> > --- /dev/null
> > +++ b/drivers/spi/spi-renesas-rpc.c
> > @@ -0,0 +1,804 @@
> [...]
> > +static void rpc_spi_hw_init(struct rpc_spi *rpc)
> > +{
> > + //
> > + // NOTE: The 0x260 are undocumented bits, but they must be set.
> > + // RPC_PHYCNT_STRTIM is strobe timing adjustment bit,
> > + // 0x0 : the delay is biggest,
> > + // 0x1 : the delay is 2nd biggest,
> > + // On H3 ES1.x, the value should be 0, while on others,
> > + // the value should be 6.
> > + //
> > + regmap_write(rpc->regmap, RPC_PHYCNT, RPC_PHYCNT_CAL |
> > + RPC_PHYCNT_STRTIM(6) | 0x260);
> > +
> > + //
> > + // NOTE: The 0x1511144 are undocumented bits, but they must be set
> > + // for RPC_PHYOFFSET1.
> > + // The 0x31 are undocumented bits, but they must be set
> > + // for RPC_PHYOFFSET2.
> > + //
> > + regmap_write(rpc->regmap, RPC_PHYOFFSET1, RPC_PHYOFFSET1_DDRTMG(3) |
> > + 0x1511144);
> > + regmap_write(rpc->regmap, RPC_PHYOFFSET2, 0x31 |
> > + RPC_PHYOFFSET2_OCTTMG(4));
> > + regmap_write(rpc->regmap, RPC_SSLDR, RPC_SSLDR_SPNDL(7) |
> > + RPC_SSLDR_SLNDL(7) | RPC_SSLDR_SCKDL(7));
> > + regmap_write(rpc->regmap, RPC_CMNCR, RPC_CMNCR_MD | RPC_CMNCR_SFDE |
> > + RPC_CMNCR_MOIIO_HIZ | RPC_CMNCR_IOFV_HIZ |
> > + RPC_CMNCR_BSZ(0));
> > +}
>
> We clearly need runtime PM get/put() calls around this code. Otherwise,
> we're dependant on U-Boot leaving the clocks enabled...
Even that would be futile, as the common clock framework disables all
unused clocks at late boot time.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
