From mboxrd@z Thu Jan 1 00:00:00 1970 From: b38343@freescale.com (Robin Gong) Date: Thu, 8 Oct 2015 17:28:28 +0800 Subject: [PATCH v2 5/8] spi: imx: Add support for loopback for ECSPI controllers In-Reply-To: <04376A3D786BD947B28569C998A374A62E280E0F@NA-MBX-02.mgc.mentorg.com> References: <20150930084219.GE2709@shlinux2> <04376A3D786BD947B28569C998A374A62E280E0F@NA-MBX-02.mgc.mentorg.com> Message-ID: <20151008092827.GB6101@shlinux2> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, Oct 01, 2015 at 12:16:49AM +0000, Bondarenko, Anton wrote: > On 30.09.2015 10:42, Robin Gong wrote: > > On Fri, Sep 25, 2015 at 07:57:12PM +0200, Anton Bondarenko wrote: > >> @@ -370,8 +374,12 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, > >> if (config->mode & SPI_CS_HIGH) > >> cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs); > >> > >> + if (config->mode & SPI_LOOP) > >> + lpb |= MX51_ECSPI_LOOP; > >> + > >> writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); > >> writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG); > >> + writel(lpb, spi_imx->base + MX51_ECSPI_TEST); > > It's better write this MX51_ECSPI_TEST only in LOOP mode. > LOOP mode can be set dynamically. This mean we should be able to set and clear the flag. > Currently only LOOP flag is used. I did not find any problems with writing 0 in the rest > fields of TEST register. Yes, I know writing 0 is harmless, but we never need to touch this register if SPI_LOOP flags not set, I'd like below: if (config->mode & SPI_LOOP) { lpb |= MX51_ECSPI_LOOP; writel(lgb, spi_imx->base + MX51_ECSPI_TEST); } > >> > >> /* > >> * Wait until the changes in the configuration register CONFIGREG > >> @@ -1276,12 +1287,13 @@ static int spi_imx_probe(struct platform_device *pdev) > >> spi_imx->bitbang.master->cleanup = spi_imx_cleanup; > >> spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message; > >> spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message; > >> - spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; > >> + spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | > >> + SPI_CS_HIGH; > > Any change? > Will be fixed in V3 > >> > >> - init_completion(&spi_imx->xfer_done); > >> + if (is_imx5x_ecspi(spi_imx)) > >> + spi_imx->bitbang.master->mode_bits |= SPI_LOOP; > >> > >> - spi_imx->devtype_data = of_id ? of_id->data : > >> - (struct spi_imx_devtype_data *) pdev->id_entry->driver_data; > >> + init_completion(&spi_imx->xfer_done); > >> > >> res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > >> spi_imx->base = devm_ioremap_resource(&pdev->dev, res); > >> -- > >> 2.5.2 > >> >