Commit 44dd1828 authored by Christophe Leroy's avatar Christophe Leroy Committed by Boris Brezillon

mtd: nand: gpio: make nCE GPIO optional

On some hardware, the nCE signal is wired to the ChipSelect associated
to bus address of the NAND, so it is automatically driven during the
memory access and it is not managed by a GPIO.
Signed-off-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: default avatarMarek Vasut <marek.vasut@gmail.com>
Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
parent 01eb9ae1
...@@ -78,7 +78,9 @@ static void gpio_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) ...@@ -78,7 +78,9 @@ static void gpio_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
gpio_nand_dosync(gpiomtd); gpio_nand_dosync(gpiomtd);
if (ctrl & NAND_CTRL_CHANGE) { if (ctrl & NAND_CTRL_CHANGE) {
gpio_set_value(gpiomtd->plat.gpio_nce, !(ctrl & NAND_NCE)); if (gpio_is_valid(gpiomtd->plat.gpio_nce))
gpio_set_value(gpiomtd->plat.gpio_nce,
!(ctrl & NAND_NCE));
gpio_set_value(gpiomtd->plat.gpio_cle, !!(ctrl & NAND_CLE)); gpio_set_value(gpiomtd->plat.gpio_cle, !!(ctrl & NAND_CLE));
gpio_set_value(gpiomtd->plat.gpio_ale, !!(ctrl & NAND_ALE)); gpio_set_value(gpiomtd->plat.gpio_ale, !!(ctrl & NAND_ALE));
gpio_nand_dosync(gpiomtd); gpio_nand_dosync(gpiomtd);
...@@ -201,7 +203,8 @@ static int gpio_nand_remove(struct platform_device *pdev) ...@@ -201,7 +203,8 @@ static int gpio_nand_remove(struct platform_device *pdev)
if (gpio_is_valid(gpiomtd->plat.gpio_nwp)) if (gpio_is_valid(gpiomtd->plat.gpio_nwp))
gpio_set_value(gpiomtd->plat.gpio_nwp, 0); gpio_set_value(gpiomtd->plat.gpio_nwp, 0);
gpio_set_value(gpiomtd->plat.gpio_nce, 1); if (gpio_is_valid(gpiomtd->plat.gpio_nce))
gpio_set_value(gpiomtd->plat.gpio_nce, 1);
return 0; return 0;
} }
...@@ -239,10 +242,13 @@ static int gpio_nand_probe(struct platform_device *pdev) ...@@ -239,10 +242,13 @@ static int gpio_nand_probe(struct platform_device *pdev)
if (ret) if (ret)
return ret; return ret;
ret = devm_gpio_request(&pdev->dev, gpiomtd->plat.gpio_nce, "NAND NCE"); if (gpio_is_valid(gpiomtd->plat.gpio_nce)) {
if (ret) ret = devm_gpio_request(&pdev->dev, gpiomtd->plat.gpio_nce,
return ret; "NAND NCE");
gpio_direction_output(gpiomtd->plat.gpio_nce, 1); if (ret)
return ret;
gpio_direction_output(gpiomtd->plat.gpio_nce, 1);
}
if (gpio_is_valid(gpiomtd->plat.gpio_nwp)) { if (gpio_is_valid(gpiomtd->plat.gpio_nwp)) {
ret = devm_gpio_request(&pdev->dev, gpiomtd->plat.gpio_nwp, ret = devm_gpio_request(&pdev->dev, gpiomtd->plat.gpio_nwp,
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment