From: "Lad, Prabhakar" <prabhakar.csengg@gmail.com> To: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>, Rob Herring <robh+dt@kernel.org>, Fabrizio Castro <fabrizio.castro.jz@renesas.com>, Wolfgang Grandegger <wg@grandegger.com>, Marc Kleine-Budde <mkl@pengutronix.de>, "David S. Miller" <davem@davemloft.net>, Jakub Kicinski <kuba@kernel.org>, Philipp Zabel <p.zabel@pengutronix.de>, linux-can@vger.kernel.org, netdev <netdev@vger.kernel.org>, "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@vger.kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Linux-Renesas <linux-renesas-soc@vger.kernel.org>, Biju Das <biju.das.jz@bp.renesas.com> Subject: Re: [PATCH v3 2/3] can: rcar_canfd: Add support for RZ/G2L family Date: Mon, 26 Jul 2021 22:58:55 +0100 [thread overview] Message-ID: <CA+V-a8sKhhjrEHb3CU9d9oPgoNJybmSYcL-N47hjsU4LDNJkjQ@mail.gmail.com> (raw) In-Reply-To: <CAMuHMdU0YkKb-_k00Zbr3aQGSHRD8639Ut207VwQ_ji0E+YL2g@mail.gmail.com> Hi Geert, Thank you for the review. On Mon, Jul 26, 2021 at 10:53 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote: > > Hi Prabhakar, > > On Wed, Jul 21, 2021 at 9:50 PM Lad Prabhakar > <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote: > > CANFD block on RZ/G2L SoC is almost identical to one found on > > R-Car Gen3 SoC's. On RZ/G2L SoC interrupt sources for each channel > > are split into different sources and the IP doesn't divide (1/2) > > CANFD clock within the IP. > > > > This patch adds compatible string for RZ/G2L family and registers > > the irq handlers required for CANFD operation. IRQ numbers are now > > fetched based on names instead of indices. For backward compatibility > > on non RZ/G2L SoC's we fallback reading based on indices. > > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> > > Thanks for the update! > > I think you misunderstood my comment on v1 about the interrupt > handlers, cfr. below. > Argh my bad I took it the other way round! > > --- a/drivers/net/can/rcar/rcar_canfd.c > > +++ b/drivers/net/can/rcar/rcar_canfd.c > > > @@ -1577,6 +1586,53 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch, > > priv->can.clock.freq = fcan_freq; > > dev_info(&pdev->dev, "can_clk rate is %u\n", priv->can.clock.freq); > > > > + if (gpriv->chip_id == RENESAS_RZG2L) { > > + char *irq_name; > > + int err_irq; > > + int tx_irq; > > + > > + err_irq = platform_get_irq_byname(pdev, ch == 0 ? "ch0_err" : "ch1_err"); > > + if (err_irq < 0) { > > + err = err_irq; > > + goto fail; > > + } > > + > > + tx_irq = platform_get_irq_byname(pdev, ch == 0 ? "ch0_trx" : "ch1_trx"); > > + if (tx_irq < 0) { > > + err = tx_irq; > > + goto fail; > > + } > > + > > + irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, > > + "canfd.ch%d_err", ch); > > + if (!irq_name) { > > + err = -ENOMEM; > > + goto fail; > > + } > > + err = devm_request_irq(&pdev->dev, err_irq, > > + rcar_canfd_channel_interrupt, 0, > > This is the same interrupt handler... > > > + irq_name, gpriv); > > + if (err) { > > + dev_err(&pdev->dev, "devm_request_irq CH Err(%d) failed, error %d\n", > > + err_irq, err); > > + goto fail; > > + } > > + irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, > > + "canfd.ch%d_trx", ch); > > + if (!irq_name) { > > + err = -ENOMEM; > > + goto fail; > > + } > > + err = devm_request_irq(&pdev->dev, tx_irq, > > + rcar_canfd_channel_interrupt, 0, > > ... as this one. > > > + irq_name, gpriv); > > + if (err) { > > + dev_err(&pdev->dev, "devm_request_irq Tx (%d) failed, error %d\n", > > + tx_irq, err); > > + goto fail; > > + } > > + } > > + > > if (gpriv->fdmode) { > > priv->can.bittiming_const = &rcar_canfd_nom_bittiming_const; > > priv->can.data_bittiming_const = > > > @@ -1711,20 +1798,51 @@ static int rcar_canfd_probe(struct platform_device *pdev) > > gpriv->base = addr; > > > > /* Request IRQ that's common for both channels */ > > - err = devm_request_irq(&pdev->dev, ch_irq, > > - rcar_canfd_channel_interrupt, 0, > > - "canfd.chn", gpriv); > > - if (err) { > > - dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n", > > - ch_irq, err); > > - goto fail_dev; > > + if (gpriv->chip_id == RENESAS_RCAR_GEN3) { > > + err = devm_request_irq(&pdev->dev, ch_irq, > > + rcar_canfd_channel_interrupt, 0, > > + "canfd.ch_int", gpriv); > > + if (err) { > > + dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n", > > + ch_irq, err); > > + goto fail_dev; > > + } > > + > > + err = devm_request_irq(&pdev->dev, g_irq, > > + rcar_canfd_global_interrupt, 0, > > + "canfd.g_int", gpriv); > > + if (err) { > > + dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n", > > + g_irq, err); > > + goto fail_dev; > > + } > > + } else { > > + err = devm_request_irq(&pdev->dev, g_recc_irq, > > + rcar_canfd_global_interrupt, 0, > > This is the same interrupt handler... > > > + "canfd.g_recc", gpriv); > > + > > + if (err) { > > + dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n", > > + g_recc_irq, err); > > + goto fail_dev; > > + } > > + > > + err = devm_request_irq(&pdev->dev, g_err_irq, > > + rcar_canfd_global_interrupt, 0, > > ... as this one. > > > + "canfd.g_err", gpriv); > > + if (err) { > > + dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n", > > + g_err_irq, err); > > + goto fail_dev; > > + } > > } > > - err = devm_request_irq(&pdev->dev, g_irq, > > - rcar_canfd_global_interrupt, 0, > > - "canfd.gbl", gpriv); > > + > > + err = reset_control_reset(gpriv->rstc1); > > + if (err) > > + goto fail_dev; > > + err = reset_control_reset(gpriv->rstc2); > > if (err) { > > - dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n", > > - g_irq, err); > > + reset_control_assert(gpriv->rstc1); > > goto fail_dev; > > } > > I did not object to having fine-grained interrupt handlers on RZ/G2L. > I did object to duplicating code in global and fine-grained interrupt > handlers. > > The trick to have both is to let the global interrupt handlers call > (conditionally) into the fine-grained handlers. In pseudo-code: > > global_interrupt_handler() > { > if (...) > fine_grained_handler1(); > > if (...) > fine_grained_handler2(); > ... > } > > On R-Car Gen3, you register the global interrupt handlers, as before. > On RZ/G2L, you register the fine-grained interrupt handlers instead. > Agreed will re-spin with the fine-grained version tomorrow. Cheers, Prabhakar > Gr{oetje,eeting}s, > > Geert > > -- > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org > > 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
next prev parent reply other threads:[~2021-07-26 21:59 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-21 19:49 [PATCH v3 0/3] Renesas RZ/G2L CANFD support Lad Prabhakar 2021-07-21 19:49 ` [PATCH v3 1/3] dt-bindings: net: can: renesas,rcar-canfd: Document RZ/G2L SoC Lad Prabhakar 2021-07-26 22:46 ` Rob Herring 2021-07-21 19:49 ` [PATCH v3 2/3] can: rcar_canfd: Add support for RZ/G2L family Lad Prabhakar 2021-07-26 9:53 ` Geert Uytterhoeven 2021-07-26 21:58 ` Lad, Prabhakar [this message] 2021-07-21 19:49 ` [PATCH v3 3/3] arm64: dts: renesas: r9a07g044: Add CANFD node Lad Prabhakar
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