Re: [PATCH net-next 1/6] net: stmmac: add platform library

From: Simon Horman <horms@kernel.org>
To: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>,
	Jose Abreu <joabreu@synopsys.com>,
	Alexei Starovoitov <ast@kernel.org>,
	bpf@vger.kernel.org, Daniel Borkmann <daniel@iogearbox.net>,
	"David S. Miller" <davem@davemloft.net>,
	Emil Renner Berthing <kernel@esmil.dk>,
	Eric Dumazet <edumazet@google.com>,
	Fabio Estevam <festevam@gmail.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Jesper Dangaard Brouer <hawk@kernel.org>,
	John Fastabend <john.fastabend@gmail.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-stm32@st-md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	netdev@vger.kernel.org, NXP Linux Team <linux-imx@nxp.com>,
	Paolo Abeni <pabeni@redhat.com>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Samin Guo <samin.guo@starfivetech.com>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Shawn Guo <shawnguo@kernel.org>
Subject: Re: [PATCH net-next 1/6] net: stmmac: add platform library
Date: Tue, 12 Sep 2023 16:52:27 +0200	[thread overview]
Message-ID: <20230912145227.GE401982@kernel.org> (raw)
In-Reply-To: <E1qfiqd-007TPL-7K@rmk-PC.armlinux.org.uk>

On Mon, Sep 11, 2023 at 04:29:11PM +0100, Russell King (Oracle) wrote:
> Add a platform library of helper functions for common traits in the
> platform drivers. Currently, this is setting the tx clock.
> 
> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

Hi Russell,

some minor issues raised by checkpatch follow.

> ---
>  drivers/net/ethernet/stmicro/stmmac/Makefile  |  2 +-
>  .../ethernet/stmicro/stmmac/stmmac_plat_lib.c | 29 +++++++++++++++++++
>  .../ethernet/stmicro/stmmac/stmmac_plat_lib.h |  8 +++++
>  3 files changed, 38 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/net/ethernet/stmicro/stmmac/stmmac_plat_lib.c
>  create mode 100644 drivers/net/ethernet/stmicro/stmmac/stmmac_plat_lib.h
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
> index 5b57aee19267..ba2cbfa0c9d1 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Makefile
> +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
> @@ -6,7 +6,7 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o	\
>  	      mmc_core.o stmmac_hwtstamp.o stmmac_ptp.o dwmac4_descs.o	\
>  	      dwmac4_dma.o dwmac4_lib.o dwmac4_core.o dwmac5.o hwif.o \
>  	      stmmac_tc.o dwxgmac2_core.o dwxgmac2_dma.o dwxgmac2_descs.o \
> -	      stmmac_xdp.o \
> +	      stmmac_xdp.o stmmac_plat_lib.o \
>  	      $(stmmac-y)
>  
>  stmmac-$(CONFIG_STMMAC_SELFTESTS) += stmmac_selftests.o
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_plat_lib.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_plat_lib.c
> new file mode 100644
> index 000000000000..abb9f512bb0e
> --- /dev/null
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_plat_lib.c
> @@ -0,0 +1,29 @@

Is an SPDX identifier appropriate here?

> +#include <linux/stmmac.h>
> +#include <linux/clk.h>
> +
> +#include "stmmac_plat_lib.h"
> +
> +int dwmac_set_tx_clk_gmii(struct clk *tx_clk, int speed)
> +{
> +	unsigned long rate;
> +
> +	switch (speed) {
> +	case SPEED_1000:
> +		rate = 125000000;
> +		break;
> +
> +	case SPEED_100:
> +		rate = 25000000;
> +		break;
> +
> +	case SPEED_10:
> +		rate = 2500000;
> +		break;
> +
> +	default:
> +		return -ENOTSUPP;

Checkpatch seems to think that EOPNOTSUPP would be more appropriate
as "ENOTSUPP is not a SUSV4 error code".

> +	}
> +
> +	return clk_set_rate(tx_clk, rate);
> +}
> +EXPORT_SYMBOL_GPL(dwmac_set_tx_clk_gmii);

...