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Date: Tue, 20 Jul 2021 12:30:55 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>,
Rob Herring <robh+dt@...nel.org>,
Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
Wolfgang Grandegger <wg@...ndegger.com>,
Marc Kleine-Budde <mkl@...gutronix.de>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
linux-can@...r.kernel.org, netdev <netdev@...r.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>,
linux-clk <linux-clk@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
Prabhakar <prabhakar.csengg@...il.com>,
Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 2/5] can: rcar_canfd: Add support for RZ/G2L family
Hi Prabhakar,
On Mon, Jul 19, 2021 at 4:39 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...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@...renesas.com>
> Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
Thanks for your patch!
> --- a/drivers/net/can/rcar/rcar_canfd.c
> +++ b/drivers/net/can/rcar/rcar_canfd.c
> @@ -37,9 +37,15 @@
> #include <linux/bitmap.h>
> #include <linux/bitops.h>
> #include <linux/iopoll.h>
> +#include <linux/reset.h>
>
> #define RCANFD_DRV_NAME "rcar_canfd"
>
> +enum rcanfd_chip_id {
> + RENESAS_RCAR_GEN3 = 0,
> + RENESAS_RZG2L,
> +};
> +
> /* Global register bits */
>
> /* RSCFDnCFDGRMCFG */
> @@ -513,6 +519,9 @@ struct rcar_canfd_global {
> enum rcar_canfd_fcanclk fcan; /* CANFD or Ext clock */
> unsigned long channels_mask; /* Enabled channels mask */
> bool fdmode; /* CAN FD or Classical CAN only mode */
> + struct reset_control *rstc1; /* Pointer to reset source1 */
> + struct reset_control *rstc2; /* Pointer to reset source2 */
Are these comments helpful? IMHO they're stating the obvious.
> + enum rcanfd_chip_id chip_id;
> };
>
> /* CAN FD mode nominal rate constants */
> @@ -1577,6 +1586,45 @@ 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 ? "can0_error" : "can1_error");
> + if (err_irq < 0) {
> + err = err_irq;
> + goto fail;
> + }
> +
> + tx_irq = platform_get_irq_byname(pdev, ch == 0 ? "can0_tx" : "can1_tx");
> + if (tx_irq < 0) {
> + err = tx_irq;
> + goto fail;
> + }
> +
> + irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
> + "canfd.chnerr%d", ch);
if (!irq_name) {
ret = -ENOMEM;
goto fail;
}
> + err = devm_request_irq(&pdev->dev, err_irq,
> + rcar_canfd_channel_interrupt, 0,
> + 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.chntx%d", ch);
Likewise.
> + err = devm_request_irq(&pdev->dev, tx_irq,
> + rcar_canfd_channel_interrupt, 0,
> + 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 =
> @@ -1649,27 +1700,64 @@ static int rcar_canfd_probe(struct platform_device *pdev)
> if (of_child && of_device_is_available(of_child))
> channels_mask |= BIT(1); /* Channel 1 */
>
> - ch_irq = platform_get_irq(pdev, 0);
> - if (ch_irq < 0) {
> - err = ch_irq;
> - goto fail_dev;
> - }
> + if (chip_id == RENESAS_RCAR_GEN3) {
> + ch_irq = platform_get_irq_byname(pdev, "ch_int");
platform_get_irq_byname_optional()?
Unless you want to urge people to update their DTB.
> + if (ch_irq < 0) {
> + /* For backward compatibility get irq by index */
> + ch_irq = platform_get_irq(pdev, 0);
> + if (ch_irq < 0)
> + return ch_irq;
> + }
>
> - g_irq = platform_get_irq(pdev, 1);
> - if (g_irq < 0) {
> - err = g_irq;
> - goto fail_dev;
> + g_irq = platform_get_irq_byname(pdev, "g_int");
Likewise,
> + if (g_irq < 0) {
> + /* For backward compatibility get irq by index */
> + g_irq = platform_get_irq(pdev, 1);
> + if (g_irq < 0)
> + return g_irq;
> + }
> + } else {
> + g_irq = platform_get_irq_byname(pdev, "g_error");
> + if (g_irq < 0)
> + return g_irq;
> +
> + g_rx_irq = platform_get_irq_byname(pdev, "g_rx_fifo");
> + if (g_rx_irq < 0)
> + return g_rx_irq;
> }
>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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
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