linux-kernel - Re: [PATCH v9 1/4] phy: cadence: Add Cadence D-PHY Rx driver

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Date:   Tue, 22 Feb 2022 19:40:34 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Pratyush Yadav <p.yadav@...com>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Swapnil Jakhade <sjakhade@...ence.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org
Subject: Re: [PATCH v9 1/4] phy: cadence: Add Cadence D-PHY Rx driver

On 31-01-22, 23:03, Pratyush Yadav wrote:
> The Cadence D-PHY can be configured in Tx (DSI) mode or Rx (CSI) mode.
> Both modes have a different programming sequence and share little among
> them. In addition, a PHY configured in Tx mode cannot be used in Rx mode
> and vice versa. For this reason, create a separate driver for the Rx
> mode to make it easier to read and maintain.
> 
> Signed-off-by: Pratyush Yadav <p.yadav@...com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> 
> ---
> 
> Changes in v9:
> - Use %ld instead of %d for printing PTR_ERR().
> 
> Changes in v8:
> - Move lanes check to start of configure sequence.
> - Change MODULE_LICENSE() to "GPL".
> - Add Laurent's R-by.
> 
> Changes in v7:
> - Add spaces after { and before } in the bands table.
> - Drop the wrapping around the for loop on cdns_dphy_rx_get_band_ctrl().
> - Make cdns_dphy_rx_wait_for_bit() inline.
> - Print an error message if registering PHY provider fails.
> 
> Changes in v6:
> - Move to a separate driver.
> 
> Changes in v5:
> - Use the new cdns_dphy_info to specify PHY ops.
> - Re-order include in alphabetical order.
> - Make bands const.
> - Drop num_bands.
> - Make i, lanes unsigned.
> - Drop the maximum check in cdns_dphy_rx_get_band_ctrl(). Let the loop
>   complete and return -EOPNOTSUPP when we reach the end.
> - Drop the "rate < bands[i].min_rate" check since the bands are in
>   ascending order.
> - Move data_lane_ctrl to start of function and make it static const.
> 
> Changes in v4:
> - Drop the submode parts. Use a different compatible for the Rx ops.
> - Make bands and num_bands static.
> 
> Changes in v3:
> - Use a table to select the band.
> - Use a table to poll the data lane ready bits.
> - Multiply the DPHY HS clock rate by 2 to get the bit rate since the
>   clock is DDR.
> 
>  drivers/phy/cadence/Kconfig        |   8 +
>  drivers/phy/cadence/Makefile       |   1 +
>  drivers/phy/cadence/cdns-dphy-rx.c | 255 +++++++++++++++++++++++++++++
>  3 files changed, 264 insertions(+)
>  create mode 100644 drivers/phy/cadence/cdns-dphy-rx.c
> 
> diff --git a/drivers/phy/cadence/Kconfig b/drivers/phy/cadence/Kconfig
> index a62910ff5591..1adde2d99ae7 100644
> --- a/drivers/phy/cadence/Kconfig
> +++ b/drivers/phy/cadence/Kconfig
> @@ -22,6 +22,14 @@ config PHY_CADENCE_DPHY
>  	  system. If M is selected, the module will be called
>  	  cdns-dphy.
>  
> +config PHY_CADENCE_DPHY_RX
> +	tristate "Cadence D-PHY Rx Support"
> +	depends on HAS_IOMEM && OF
> +	select GENERIC_PHY
> +	select GENERIC_PHY_MIPI_DPHY
> +	help
> +	  Support for Cadence D-PHY in Rx configuration.
> +
>  config PHY_CADENCE_SIERRA
>  	tristate "Cadence Sierra PHY Driver"
>  	depends on OF && HAS_IOMEM && RESET_CONTROLLER
> diff --git a/drivers/phy/cadence/Makefile b/drivers/phy/cadence/Makefile
> index 26e16bd34efe..e17f035ddece 100644
> --- a/drivers/phy/cadence/Makefile
> +++ b/drivers/phy/cadence/Makefile
> @@ -1,5 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  obj-$(CONFIG_PHY_CADENCE_TORRENT)	+= phy-cadence-torrent.o
>  obj-$(CONFIG_PHY_CADENCE_DPHY)	+= cdns-dphy.o
> +obj-$(CONFIG_PHY_CADENCE_DPHY_RX)	+= cdns-dphy-rx.o
>  obj-$(CONFIG_PHY_CADENCE_SIERRA)	+= phy-cadence-sierra.o
>  obj-$(CONFIG_PHY_CADENCE_SALVO)	+= phy-cadence-salvo.o
> diff --git a/drivers/phy/cadence/cdns-dphy-rx.c b/drivers/phy/cadence/cdns-dphy-rx.c
> new file mode 100644
> index 000000000000..c9bb8c7f16f6
> --- /dev/null
> +++ b/drivers/phy/cadence/cdns-dphy-rx.c
> @@ -0,0 +1,255 @@
> +// SPDX-License-Identifier: GPL-2.0+

GPL v2 and more...

> +/*
> + * Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com/

this should say 2022 as well

> +MODULE_AUTHOR("Pratyush Yadav <p.yadav@...com>");
> +MODULE_DESCRIPTION("Cadence D-PHY Rx Driver");
> +MODULE_LICENSE("GPL");

This means GPL v2 only and does not match SPDX tag, pls update

-- 
~Vinod