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71 lines
1.9 KiB
71 lines
1.9 KiB
8 years ago
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From: Felix Fietkau <nbd@nbd.name>
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Date: Fri, 9 Dec 2016 20:09:16 +0100
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Subject: [PATCH] spi: spi-ath79: support multiple internal chip select
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lines
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Several devices with multiple flash chips use the internal chip select
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lines. Don't assume that chip select 1 and above are GPIO lines.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/drivers/spi/spi-ath79.c
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+++ b/drivers/spi/spi-ath79.c
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@@ -78,14 +78,16 @@ static void ath79_spi_chipselect(struct
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ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
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}
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- if (spi->chip_select) {
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+ if (gpio_is_valid(spi->cs_gpio)) {
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/* SPI is normally active-low */
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gpio_set_value(spi->cs_gpio, cs_high);
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} else {
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+ u32 cs_bit = AR71XX_SPI_IOC_CS(spi->chip_select);
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+
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if (cs_high)
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- sp->ioc_base |= AR71XX_SPI_IOC_CS0;
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+ sp->ioc_base |= cs_bit;
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else
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- sp->ioc_base &= ~AR71XX_SPI_IOC_CS0;
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+ sp->ioc_base &= ~cs_bit;
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ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
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}
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@@ -118,11 +120,8 @@ static int ath79_spi_setup_cs(struct spi
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struct ath79_spi *sp = ath79_spidev_to_sp(spi);
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int status;
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- if (spi->chip_select && !gpio_is_valid(spi->cs_gpio))
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- return -EINVAL;
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-
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status = 0;
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- if (spi->chip_select) {
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+ if (gpio_is_valid(spi->cs_gpio)) {
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unsigned long flags;
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flags = GPIOF_DIR_OUT;
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@@ -134,10 +133,12 @@ static int ath79_spi_setup_cs(struct spi
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status = gpio_request_one(spi->cs_gpio, flags,
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dev_name(&spi->dev));
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} else {
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+ u32 cs_bit = AR71XX_SPI_IOC_CS(spi->chip_select);
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+
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if (spi->mode & SPI_CS_HIGH)
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- sp->ioc_base &= ~AR71XX_SPI_IOC_CS0;
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+ sp->ioc_base &= ~cs_bit;
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else
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- sp->ioc_base |= AR71XX_SPI_IOC_CS0;
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+ sp->ioc_base |= cs_bit;
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ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
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}
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@@ -147,7 +148,7 @@ static int ath79_spi_setup_cs(struct spi
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static void ath79_spi_cleanup_cs(struct spi_device *spi)
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{
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- if (spi->chip_select) {
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+ if (gpio_is_valid(spi->cs_gpio)) {
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gpio_free(spi->cs_gpio);
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}
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}
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