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SubjectRe: [PATCH 1/2] net: macb: Fix compilation on systems without COMMON_CLK
Date
On 24/06/2019 at 08:16, Palmer Dabbelt wrote:
> External E-Mail
>
>
> The patch to add support for the FU540-C000 added a dependency on
> COMMON_CLK, but didn't express that via Kconfig. This fixes the build
> failure by adding CONFIG_MACB_FU540, which depends on COMMON_CLK and
> conditionally enables the FU540-C000 support.

Let's try to limit the use of #ifdef's throughout the code. We are
using them in this driver but only for the hot paths and things that
have an impact on performance. I don't think it's the case here: so
please find another option => NACK.

> I've built this with a powerpc allyesconfig (which pointed out the bug)
> and on RISC-V, manually checking to ensure the code was built. I
> haven't even booted the resulting kernels.
>
> Fixes: c218ad559020 ("macb: Add support for SiFive FU540-C000")
> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
> ---
> drivers/net/ethernet/cadence/Kconfig | 11 +++++++++++
> drivers/net/ethernet/cadence/macb_main.c | 12 ++++++++++++
> 2 files changed, 23 insertions(+)
>
> diff --git a/drivers/net/ethernet/cadence/Kconfig b/drivers/net/ethernet/cadence/Kconfig
> index 1766697c9c5a..74ee2bfd2369 100644
> --- a/drivers/net/ethernet/cadence/Kconfig
> +++ b/drivers/net/ethernet/cadence/Kconfig
> @@ -40,6 +40,17 @@ config MACB_USE_HWSTAMP
> ---help---
> Enable IEEE 1588 Precision Time Protocol (PTP) support for MACB.
>
> +config MACB_FU540
> + bool "Enable support for the SiFive FU540 clock controller"
> + depends on MACB && COMMON_CLK
> + default y
> + ---help---
> + Enable support for the MACB/GEM clock controller on the SiFive
> + FU540-C000. This device is necessary for switching between 10/100
> + and gigabit modes on the FU540-C000 SoC, without which it is only
> + possible to bring up the Ethernet link in whatever mode the
> + bootloader probed.
> +
> config MACB_PCI
> tristate "Cadence PCI MACB/GEM support"
> depends on MACB && PCI && COMMON_CLK
> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index c545c5b435d8..a903dfdd4183 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -41,6 +41,7 @@
> #include <linux/pm_runtime.h>
> #include "macb.h"
>
> +#ifdef CONFIG_MACB_FU540
> /* This structure is only used for MACB on SiFive FU540 devices */
> struct sifive_fu540_macb_mgmt {
> void __iomem *reg;
> @@ -49,6 +50,7 @@ struct sifive_fu540_macb_mgmt {
> };
>
> static struct sifive_fu540_macb_mgmt *mgmt;
> +#endif
>
> #define MACB_RX_BUFFER_SIZE 128
> #define RX_BUFFER_MULTIPLE 64 /* bytes */
> @@ -3956,6 +3958,7 @@ static int at91ether_init(struct platform_device *pdev)
> return 0;
> }
>
> +#ifdef CONFIG_MACB_FU540
> static unsigned long fu540_macb_tx_recalc_rate(struct clk_hw *hw,
> unsigned long parent_rate)
> {
> @@ -4056,7 +4059,9 @@ static int fu540_c000_init(struct platform_device *pdev)
>
> return macb_init(pdev);
> }
> +#endif
>
> +#ifdef CONFIG_MACB_FU540
> static const struct macb_config fu540_c000_config = {
> .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO |
> MACB_CAPS_GEM_HAS_PTP,
> @@ -4065,6 +4070,7 @@ static const struct macb_config fu540_c000_config = {
> .init = fu540_c000_init,
> .jumbo_max_len = 10240,
> };
> +#endif
>
> static const struct macb_config at91sam9260_config = {
> .caps = MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
> @@ -4155,7 +4161,9 @@ static const struct of_device_id macb_dt_ids[] = {
> { .compatible = "cdns,emac", .data = &emac_config },
> { .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config},
> { .compatible = "cdns,zynq-gem", .data = &zynq_config },
> +#ifdef CONFIG_MACB_FU540
> { .compatible = "sifive,fu540-macb", .data = &fu540_c000_config },
> +#endif
> { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(of, macb_dt_ids);
> @@ -4363,7 +4371,9 @@ static int macb_probe(struct platform_device *pdev)
>
> err_disable_clocks:
> clk_disable_unprepare(tx_clk);
> +#ifdef CONFIG_MACB_FU540
> clk_unregister(tx_clk);
> +#endif
> clk_disable_unprepare(hclk);
> clk_disable_unprepare(pclk);
> clk_disable_unprepare(rx_clk);
> @@ -4398,7 +4408,9 @@ static int macb_remove(struct platform_device *pdev)
> pm_runtime_dont_use_autosuspend(&pdev->dev);
> if (!pm_runtime_suspended(&pdev->dev)) {
> clk_disable_unprepare(bp->tx_clk);
> +#ifdef CONFIG_MACB_FU540
> clk_unregister(bp->tx_clk);
> +#endif
> clk_disable_unprepare(bp->hclk);
> clk_disable_unprepare(bp->pclk);
> clk_disable_unprepare(bp->rx_clk);
>


--
Nicolas Ferre
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