From d6bbd1193fe93b7ee037724553b3574dcb48e6da Mon Sep 17 00:00:00 2001 From: Serge Semin Date: Thu, 8 Oct 2020 02:54:51 +0300 Subject: spi: dw: Add DWC SSI capability Currently DWC SSI core is supported by means of setting up the core-specific update_cr0() callback. It isn't suitable for multiple reasons. First of all having exported several methods doing the same thing but for different chips makes the code harder to maintain. Secondly the spi-dw-core driver exports the methods, then the spi-dw-mmio driver sets the private data callback with one of them so to be called by the core driver again. That makes the code logic too complicated. Thirdly using callbacks for just updating the CR0 register is problematic, since in case if the register needed to be updated from different parts of the code, we'd have to create another callback (for instance the SPI device-specific parameters don't need to be calculated each time the SPI transfer is submitted, so it's better to pre-calculate the CR0 data at the SPI-device setup stage). So keeping all the above in mind let's discard the update_cr0() callbacks, define a generic and static dw_spi_update_cr0() method and create the DW_SPI_CAP_DWC_SSI capability, which when enabled would activate the alternative CR0 register layout. While at it add the comments to the code path of the normal DW APB SSI controller setup to make the dw_spi_update_cr0() method looking coherent. Signed-off-by: Serge Semin Link: https://lore.kernel.org/r/20201007235511.4935-3-Sergey.Semin@baikalelectronics.ru Signed-off-by: Mark Brown --- drivers/spi/spi-dw-pci.c | 6 ------ 1 file changed, 6 deletions(-) (limited to 'drivers/spi/spi-dw-pci.c') diff --git a/drivers/spi/spi-dw-pci.c b/drivers/spi/spi-dw-pci.c index 271839a8add0..8a91cd58102f 100644 --- a/drivers/spi/spi-dw-pci.c +++ b/drivers/spi/spi-dw-pci.c @@ -48,9 +48,6 @@ static int spi_mid_init(struct dw_spi *dws) iounmap(clk_reg); - /* Register hook to configure CTRLR0 */ - dws->update_cr0 = dw_spi_update_cr0; - dw_spi_dma_setup_mfld(dws); return 0; @@ -58,9 +55,6 @@ static int spi_mid_init(struct dw_spi *dws) static int spi_generic_init(struct dw_spi *dws) { - /* Register hook to configure CTRLR0 */ - dws->update_cr0 = dw_spi_update_cr0; - dw_spi_dma_setup_generic(dws); return 0; -- cgit v1.2.3